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1.
Maria von Korff Huajun Wang Jens Léon Klaus Pillen 《Molecular breeding : new strategies in plant improvement》2008,21(1):81-93
Malting quality is genetically determined by the complex interaction of numerous traits which are expressed prior to and,
in particular, during the malting process. Here, we applied the advanced backcross quantitative trait locus (AB-QTL) strategy
(Tanksley and Nelson, Theor Appl Genet 92:191–203, 1996), to detect QTLs for malting quality traits and, in addition, to identify favourable exotic alleles for the improvement of
malting quality. For this, the BC2DH population S42 was generated from a cross between the spring barley cultivar Scarlett and the wild barley accession ISR42-8
(Hordeum vulgare ssp. spontaneum). A QTL analysis in S42 for seven malting parameters measured in two different environments yielded 48 QTLs. The exotic genotype
improved the trait performance at 18 (37.5%) of 48 QTLs. These favourable exotic alleles were detected, in particular, on
the chromosome arms 3HL, 4HS, 4HL and 6HL. The exotic allele on 4HL, for example, improved α-amylase activity by 16.3%, fermentability
by 0.8% and reduced raw protein by 2.4%. On chromosome 6HL, the exotic allele increased α-amylase by 16.0%, fermentability
by 1.3%, friability by 7.3% and reduced viscosity by 2.9%. Favourable transgressive segregation, i.e. S42 lines exhibiting
significantly better performance than the recurrent parent Scarlett, was recorded for four traits. For α-amylase, fermentability,
fine-grind extract and VZ45 20, 16, 2 and 26 S42 lines, respectively, surpassed the recurrent parent Scarlett. The present
study hence demonstrates that wild barley does harbour valuable alleles, which can enrich the genetic basis of cultivated
barley and improve malting quality traits. 相似文献
2.
Detection and verification of malting quality QTLs using wild barley introgression lines 总被引:1,自引:0,他引:1
Inga Schmalenbach Klaus Pillen 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2009,118(8):1411-1427
A malting quality quantitative trait locus (QTL) study was conducted using a set of 39 wild barley introgression lines (hereafter
abbreviated with S42ILs). Each S42IL harbors a single marker-defined chromosomal segment from the wild barley accession ‘ISR
42-8’ (Hordeum vulgare ssp. spontaneum) within the genetic background of the elite spring barley cultivar ‘Scarlett’ (Hordeum vulgare ssp. vulgare). The aim of the study was (1) to verify genetic effects previously identified in the advanced backcross population S42,
(2) to detect new QTLs, and (3) to identify S42ILs exhibiting multiple QTL effects. For this, grain samples from field tests
in three different environments were subjected to micro malting. Subsequently, a line × phenotype association study was performed
with the S42ILs in order to localize putative QTL effects. A QTL was accepted if the trait value of a particular S42IL was
significantly (P < 0.05) different from the recurrent parent as a control, either across all tested environments or in a particular environment.
For eight malting quality traits, altogether 40 QTLs were localized, among which 35 QTLs (87.5%) were stable across all environments.
Six QTLs (15.0%) revealed a trait improving wild barley effect. Out of 36 QTLs detected in a previous advanced backcross QTL
study with the parent BC2DH population S42, 18 QTLs (50.0%) could be verified with the S42IL set. For the quality parameters α-amylase activity and
Hartong 45°C, all QTLs assessed in population S42 were verified by S42ILs. In addition, eight new QTL effects and 17 QTLs
affecting two newly investigated traits were localized. Two QTL clusters harboring simultaneous effects on eight and six traits,
respectively, were mapped to chromosomes 1H and 4H. In future, fine-mapping of these QTL regions will be conducted in order
to shed further light on the genetic basis of the most interesting QTLs. 相似文献
3.
Identification and verification of QTLs for agronomic traits using wild barley introgression lines 总被引:2,自引:1,他引:1
Schmalenbach I Léon J Pillen K 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2009,118(3):483-497
A set of 39 wild barley introgression lines (hereafter abbreviated with S42ILs) was subjected to a QTL study to verify genetic
effects for agronomic traits, previously detected in the BC2DH population S42 (von Korff et al. 2006 in Theor Appl Genet 112:1221–1231) and, in addition, to identify new QTLs and favorable wild barley alleles. Each line within
the S42IL set contains a single marker-defined chromosomal introgression from wild barley (Hordeum vulgare ssp. spontaneum), whereas the remaining part of the genome is exclusively derived from elite spring barley (H. vulgare ssp. vulgare). Agronomic field data of the S42ILs were collected for seven traits from three different environments during the 2007 growing
season. For detection of putative QTLs, a two-factorial mixed model ANOVA and, subsequently, a Dunnett test with the recurrent
parent as a control were conducted. The presence of a QTL effect on a wild barley introgression was accepted, if the trait
value of a particular S42IL was significantly (P < 0.05) different from the control, either across all environments and/or in a particular environment. A total of 47 QTLs
were localized in the S42IL set, among which 39 QTLs were significant across all tested environments. For 19 QTLs (40.4%),
the wild barley introgression was associated with a favorable effect on trait performance. Von Korff et al. (2006 in Theor Appl Genet 112:1221–1231) mapped altogether 44 QTLs for six agronomic traits to genomic regions, which are represented
by wild barley introgressions of the S42IL set. Here, 18 QTLs (40.9%) revealed a favorable wild barley effect on the trait
performance. By means of the S42ILs, 20 out of the 44 QTLs (45.5%) and ten out of the 18 favorable effects (55.6%) were verified.
Most QTL effects were confirmed for the traits days until heading and plant height. For the six corresponding traits, a total
of 17 new QTLs were identified, where at six QTLs (35.3%) the exotic introgression caused an improved trait performance. In
addition, eight QTLs for the newly studied trait grains per ear were detected. Here, no QTL from wild barley exhibited a favorable
effect. The introgression line S42IL-107, which carries an introgression on chromosome 2H, 17–42 cM is an example for S42ILs
carrying several QTL effects simultaneously. This line exhibited improved performance across all tested environments for the
traits days until heading, plant height and thousand grain weight. The line can be directly used to transfer valuable Hsp alleles into modern elite cultivars, and, thus, for breeding of improved varieties. 相似文献
4.
Kazuhiro Sato Hiroshi Hisano Satoko Matsumoto Tian-Su Zhou Makoto Kihara 《Molecular breeding : new strategies in plant improvement》2018,38(1):14
The α–amylase activity of cultivated barley is critically important to the brewing industry. Here, we surveyed variation in malt α–amylase activity in 343 cultivated barley accessions from around the world. Population structure analysis based on genotype data at 1536 SNPs clustered these accessions into two groups, one comprising South-East Asian and Ethiopian accessions and one group containing the other accessions. A genome-wide association study identified significant quantitative trait loci (QTLs) for α–amylase activity on all seven chromosomes of barley. Accessions showing high and low α–amylase activity were crossed with the high-quality Japanese malting barley cv. Harun Nijo to develop F2 mapping populations. We identified two QTLs on chromosome 6H in a cross between Haruna Nijo (high activity) × Weal (highest activity). Single QTLs were identified each on 3H, 4H, and 5H from a cross between Haruna Nijo (high activity) × VLB-1 (low activity), indicating that the high α–amylase activity in Haruna Nijo might be derived from loci on these chromosomes. The addition of the high α–amylase activity QTL alleles from chromosome 6H in cv. Weal further increased the α–amylase activity conferred by alleles of Haruna Nijo. These results demonstrate that a target haplotype can be successfully improved using a strategy comprising diversity analysis of ex situ collections followed by introducing effective new alleles. 相似文献
5.
江西东乡野生稻苗期抗旱基因定位 总被引:2,自引:0,他引:2
普通野生稻是栽培稻的祖先种,其遗传多样性远远大于栽培稻,蕴涵着栽培品种中难以找到的重要性状.以江西东乡普通野生稻为供体、以桂朝2号为遗传背景的野生稻基因渗入系(BC4F5、BC4F6)为材料,利用30%的PEG人工模拟干旱环境,对渗入系二叶一心苗期进行抗旱鉴定,共定位了12个与抗旱有关的QTL,其中在第2、6和12染色体上发现了4个QTL的加性效应值为正,来自东乡野生稻的等位基因能使渗入系的抗旱性增强,特别是位于第12染色体RM17附近的qSDT12-2在多次重复中均被检测到,在PEG处理后1-8 d能稳定表达.通过对抗旱性QTL的动态分析,发现不同QTL表达时间不同. 相似文献
6.
Gaofeng Zhou Joe Panozzo Xiao-qi Zhang Mehmet Cakir Stefan Harasymow Chengdao Li 《Molecular breeding : new strategies in plant improvement》2016,36(6):70
Australia and Canada are major exporters of malting barley (Hordeum vulgare L.), with Baudin from Australia and AC Metcalfe from Canada being the benchmark varieties for premium malting quality in the past 10 years. We used the barley doubled haploid population derived from a cross of Baudin and AC Metcalfe to map quantitative trait loci (QTLs) for malting quality. The results revealed different genetic architectures controlling malting quality for the two cultivars. Sixteen QTLs were identified and located on chromosomes 1H, 2H, 5H and 7H. The Australian barley Baudin mainly contributed to the malting quality QTL traits of high diastatic power and high β-glucanase on chromosome 1H, while Canadian barley AC Metcalfe mainly contributed to the QTL traits of high hot water extract, high free amino nitrogen, high α-amylase and low malt yield in chromosome 5HL telomere region. This study demonstrated the potential to breed new barley varieties with superior malting quality by integrating genes from Australian and Canadian malting barley varieties. This paper also provides methods to anchor traditional molecular markers without sequence information, such as amplified fragment length polymorphism markers, into the physical map of barley cv. ‘Morex’. 相似文献
7.
Suong T. Cu Timothy J. March Susan Stewart Sophia Degner Stewart Coventry Amanda Box Doug Stewart Birgitte Skadhauge Rachel A. Burton Geoffrey B. Fincher Jason Eglinton 《Molecular breeding : new strategies in plant improvement》2016,36(9):129
Quantitative trait loci (QTLs) associated with grain weight, grain width, kernel hardness and malting quality were mapped in a doubled haploid population derived from two elite Australian malting barley varieties, Navigator and Admiral. A total of 30 QTLs for grain weight, grain width and kernel hardness were identified in three environments, and 63 QTLs were identified for ten malting quality traits in two environments. Three malting quality traits, namely β-amylase, diastatic power and apparent attenuation limit, were mainly controlled by a QTL linked to the Bmy1 gene at the distal end of chromosome 4H encoding a β-amylase enzyme. Six other malting quality traits, namely α-amylase, soluble protein, Kolbach index, free amino-acid nitrogen, wort β-glucan and viscosity, had coincident QTL clustered on chromosomes 1HS, 4HS, 7HS and 7HL, which demonstrated the interdependence of these traits. There was a strong association between these malt quality QTL clusters on chromosomes 1HS and 7HL and the major QTL for kernel hardness, suggesting that the use of this trait to enable early selection for malting quality in breeding programs would be feasible. In contrast, the majority of QTLs for hot-water extract were not coincident with those identified for other malt quality traits, which suggested differences in the mechanism controlling this trait. Novel QTLs have been identified for kernel hardness on chromosomes 2HL and 7HL, hot-water extract on 7HL and wort β-glucan on 6HL, and the resulting markers may be useful for marker-assisted selection in breeding programs. 相似文献
8.
Ayoub M Symons J Edney J Mather E 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2002,105(2-3):237-247
The suitability of barley ( Hordeum vulgare L.) grain for malting depends on many criteria, including the size, shape and uniformity of the kernels. Here, image analysis was used to measure kernel size and shape attributes (area, perimeter, length, width, F-circle and F-shape) in grain samples of 140 doubled-haploid lines from a two-rowed (cv Harrington) by six-rowed (cv Morex) barley cross. Interval mapping was used to map quantitative trait loci (QTLs) affecting the means and within-sample standard deviations of these attributes using a 107-marker genome map. Regions affecting one or more kernel size and shape traits were detected on all seven chromosomes. These included one near the vrs1 locus on chromosome 2 and one near the int-c locus on chromosome 4. Some, but not all, of the QTLs exhibited interactions with the environment and some QTLs affected the within-sample variability of kernel size and shape without affecting average kernel size and shape. When QTL analysis was conducted using data from only the two-rowed lines, the region on chromosome 2 was not detected but QTLs were detected elsewhere in the genome, including some that had not been detected in the analysis of the whole population. Analysis of only the six-rowed lines did not detect any QTLs affecting kernel size and shape attributes. QTL alleles that made kernels larger and/or rounder also tended to improve malt quality and QTL alleles that increased the variability of kernel size were associated with poor malt quality. 相似文献
9.
Shao-Xia ZHOU 《Acta Genetica Sinica》2006,33(6):551-558
Common wild rice (Oryza rufipogon Griff.) is the ancestor of cultivated rice (O. sativa L.), which has a greater genetic diversity and important traits that remain to be employed in cultivated rice. In this study, a set of introgression lines (BC4F5 and/or BC4F6) carrying various introgressed segments from common wild rice, collected from Dongxiang county, Jiangxi Province, China, in the background of an Indica (O. sativa L. ssp. indica) cultivar, Guichao 2, was used. A total of 12 drought-related quantitative trait loci (QTL) were identified by investigating drought tolerance of introgression lines under 30% PEG treatment at the young seedlings stage. Of these QTLs, the alleles of 4 QTLs on chromosome 2, 6 and 12 from Dongxiang common wild rice were responsible for increased drought tolerance of the introgression lines. In particular, a QTL qSDT12-2, near RM17 on chromosome 12, was consistently detected in different replications, and expressed stably under PEG stress throughout the study. It was also found that the QTLs located on different chromosomes might express at different stages. 相似文献
10.
Magdalena Wójcik-Jagła Marcin Rapacz Mirosław Tyrka Janusz Kościelniak Katarzyna Crissy Katarzyna Żmuda 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2013,126(12):3021-3034
Key message
An effective approach for the further evolution of QTL markers, may be to create mapping populations for locally adapted gene pools, and to phenotype the studied trait under local conditions.Abstract
Mapping populations of Polish fodder and malting spring barleys (Hordeum vulgare L.) were used to analyze traits describing short-time drought response at the seedlings stage. High-throughput genotyping (Diversity Array Technology (DArT) markers) and phenotyping techniques were used. The results showed high genetic diversity of the studied populations which allowed the creation of high-density linkage maps. There was also high diversity in the physiological responses of the barleys. Quantitative trait locus (QTL) analysis revealed 18 QTLs for nine physiological traits on all chromosomes except 1H in malting barley and 15 QTLs for five physiological traits on chromosomes 2H, 4H, 5H and 6H in fodder barley. Chromosomes 4H and 5H contained QTLs which explained most of the observed phenotypic variations in both populations. There was a major QTL for net photosynthetic rate in the malting barley located on chromosome 5H and two major QTLs for overall photochemical performance (PI) located on 5H and 7H. One major QTL related to photochemical quenching of chlorophyll fluorescence was located on chromosome 4H in fodder barley. Three QTL regions were common to both mapping populations but the corresponding regions explained different drought-induced traits. One region was for QTLs related to PSII photosynthetic activity stress index in malting barley, and the corresponding region in fodder barley was related to the water content stress index. These results are in accordance with previous studies which showed that different traits were responsible for drought tolerance variations in fodder and malting barleys. 相似文献11.
Selecting a set of wild barley introgression lines and verification of QTL effects for resistance to powdery mildew and leaf rust 总被引:4,自引:3,他引:1
Schmalenbach I Körber N Pillen K 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2008,117(7):1093-1106
A set of 59 spring barley introgression lines (ILs) was developed from the advanced backcross population S42. The ILs were
generated by three rounds of backcrossing, two to four subsequent selfings, and, in parallel, marker-assisted selection. Each
line includes a single marker-defined chromosomal segment of the wild barley accession ISR42-8 (Hordeum vulgare ssp. spontaneum), whereas the remaining part of the genome is derived from the elite barley cultivar Scarlett (H. vulgare ssp. vulgare). Based on a map containing 98 SSR markers, the IL set covers so far 86.6% (1041.5 cM) of the donor genome. Each single line
contains an average exotic introgression of 39.2 cM, representing 3.2% of the exotic genome. The utility of the developed
IL set is illustrated by verification of QTLs controlling resistance to powdery mildew (Blumeria
graminis f. sp. hordei L.) and leaf rust (Puccinia hordei L.) which were previously identified in the advanced backcross population S42. Altogether 57.1 and 75.0% of QTLs conferring
resistance to powdery mildew and leaf rust, respectively, were verified by ILs. The strongest favorable effects were mapped
to regions 1H, 0–85 cM and 4H, 125–170 cM, where susceptibility to powdery mildew and leaf rust was decreased by 66.1 and
34.7%, respectively, compared to the recurrent parent. In addition, three and one new QTLs were localized, respectively. A
co-localization of two favorable QTLs was identified for line S42IL-138, which holds an introgressed segment in region 7H,
166–181. Here, a reduction effect was revealed for powdery mildew as well as for leaf rust severity. This line might be a
valuable resource for transferring new resistance alleles into elite cultivars. In future, we aim to cover the complete exotic
genome by selecting additional ILs. We intend to conduct further phenotype studies with the IL set in regard to the trait
complexes agronomic performance, malting quality, biotic stress, and abiotic stress. 相似文献
12.
Cassandra K. Walker J. F. Panozzo R. Ford P. Eckermann D. Moody A. Lehmensiek R. Appels 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2011,122(1):151-162
A breeding objective for the malting barley industry is to produce lines with softer, plumper grain containing moderate protein
content (9–12%) as they are more likely to imbibe water readily and contain more starch per grain, which in turn produces
higher levels of malt extract. In a malting barley mapping population, ‘Arapiles’ × ‘Franklin’, the most significant and robust
quantitative trait locus (QTL) for endosperm hardness was observed on the short arm of chromosome 1H, across three environments
over two growing seasons. This accounted for 22.6% (Horsham 2000), 26.8% (Esperance 2001), and 12.0% (Tarranyurk 2001) of
the genetic variance and significantly increased endosperm hardness by 2.06–3.03 SKCS hardness units. Interestingly, Arapiles
and Franklin do not vary in Ha locus alleles. Therefore, this region, near the centromere on chromosome 1H, may be of great importance when aiming to manipulate
endosperm hardness and malting quality. Interestingly, this region, close to the centromere on chromosome 1H, in our study,
aligns with the region of the genome that includes the HvCslF9 and the HvGlb1 genes. Potentially, one or both of these genes could be considered to be candidate genes that influence endosperm hardness
in the barley grain. Additional QTLs for endosperm hardness were detected on chromosomes 2H, 3H, 6H and 7H, confirming that
the hardness trait in barley is complex and multigenic, similar to many malting quality traits of interest. 相似文献
13.
ABSTRACT: BACKGROUND: Land plants have evolved several measures to maintain their life against abiotic stresses. The accumulation of proline is the most generalized response of plants under drought, heat or salt stress conditions. It is known as an osmoprotectant which also acts as an instant source of energy during drought recovery process. But, both its role and genetic inheritance are poorly understood in agriculture crops. In the present work, advanced backcross quantitative trait locus (AB-QTL) analysis was performed to elucidate genetic mechanisms controlling proline accumulation and leaf wilting in barley under drought stress conditions. RESULTS: The analysis revealed eight QTL associated to proline content (PC) and leaf wilting (WS). QTL for PC were localized on chromosome 3 H, 4 H, 5 H and 6 H. The strongest QTL effect QPC.S42.5 H was detected on chromosome 5 H where drought inducible exotic allele was associated to increase PC by 54%. QTL effects QPC.S42.3 H, QPC.S42.4 H and QPC.S42.6 H were responsible to heighten PC due to the preeminence of elite alleles over the exotic alleles which ranged from 26% to 43%. For WS, QTL have been localized on chromosome 1 H, 2 H, 3 H and 4 H. Among these, QWS.S42.1 H and QWS.S42.4 H were associated to decrease in WS due to the introgression of exotic alleles. In addition, two digenic epistatic interaction effects were detected for WS where the additive effect of exotic alleles imparted a favorable increase in the trait value. CONCLUSIONS: The present data represents a first report on whole-genome mapping of proline accumulation and leaf wilting in barley. The detected QTL are linked to new alleles from both cultivated and wild accessions which bring out an initial insight on the genetic inheritance of PC and WS. These QTL alleles are fixed in the isogenic background of Scarlett, which will allow for positional cloning of underlying genes and to develop drought resilient barley cultivars. 相似文献
14.
Md. Arifuzzaman Mohammed A. Sayed Shumaila Muzammil Klaus Pillen Henrik Schumann Ali Ahmad Naz Jens Léon 《Molecular breeding : new strategies in plant improvement》2014,34(3):1373-1387
Shoot and root attributes are essential for plant performance in agriculture. Here, we report detection and validation of quantitative trait loci (QTL) for shoot and root traits in 301 BC2DH lines achieved by crossing cultivar Scarlett and wild barley accession ISR42-8. Phenotypic evaluations were made for six traits across 3 years under control and drought conditions. QTL analysis was performed using 371 DNA markers genotyped by different protocols, such as sequence repeats, diversity array technology as well as gene-specific markers. Marker by trait analysis revealed 33 QTL of which 15 and 18 QTL showed trait-improving effects of the exotic and elite alleles, respectively. Two major QTL for plant height (PH) were found on chromosome 2H (QPh.S42.2H) and 3H (QPh.S42.3H.b). The strongest QTL QSdw.S42.5H for increasing shoot dry weight was associated with an exotic allele on chromosome 5H. QTL QTkw.S42.1H underlie a novel exotic allele that improved thousand kernel weight. Seven QTL were associated with root dry weight of which at four loci introgression of exotic alleles enhanced traits values. The strongest QTL QRdw.S42.7H was linked to a gene-specific marker VrnH3 on chromosome 7H. At QRl.S42.5H, the exotic allele accounted for a 9 % increase in root length. In addition, 18 epistatic interactions were linked to PH, shoot and root dry weights. QTL validation was performed with 53 introgression lines (ILs) carrying ISR42-8 introgressions in the Scarlett background. Nine novel QTL alleles of exotic origin were validated in the isogenic background. These QTL-bearing ILs provide valuable genetic resources for plant breeding and positional cloning of the underlying genes. 相似文献
15.
F. Han S. E. Ullrich A. Kleinhofs B. L. Jones P. M. Hayes D. M. Wesenberg 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1997,95(5-6):903-910
Current techniques for quantitative trait locus (QTLs) analyses provide only approximate locations of QTLs on chromosomes.
Further resolution of identified QTL regions is often required for detailed characterization. An important region containing
malting-quality QTLs on barley (Hordeum vulgare L.) chromosome 1 was identified by previous QTL analyses in a Steptoe×Morex cross. This region contains two putative adjacent
overlapping QTLs, each of which has effects on malt-extract percentage, α-amylase activity, diastatic power, and malt β-glucan
content. All favorable alleles for these traits are attributed to Morex. The objective of the present study was fine structure
mapping of this complex QTL region to elucidate whether these two putative overlapping QTLs are really one QTL. Another question
was whether the apparently overlapping QTLs are due to the pleiotropic effects of a single gene, or the independent effects
of several genes. A high-resolution map in the target region was developed which spans approximately 27 cM. Molecular-marker-assisted
backcrossing was employed to create isogenic lines with a Steptoe background differing only in the region containing the QTLs
of interest. A total of 32 different recombinants were identified, of which eight most-informative isogenic lines plus one
reconstructed Steptoe control were selected for field testing. The additive effects on malt-extract percentage, α-amylase
activity, diastatic power, and malt β-glucan content from eight isogenic lines were calculated based on malting data from
three locations. By comparing the significant additive effects among isogenic lines carrying different Morex fragments, two
QTLs each for malt extract and for α-amylase, and two to three for diastatic power were identified in certain environments
and resolved into 1–8-cM genome fragments. There was a significant QTL×environment interaction for diastatic power, and there
are indications that epistatic interactions for malt β-glucan content occur between the QTLs on chromosome 1 and QTLs on other
chromosomes.
Received : 4 June 1997 / Accepted : 19 June 1997 相似文献
16.
von Korff M Wang H Léon J Pillen K 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2006,112(7):1221-1231
The objective of the present study was to identify favourable exotic Quantitative Trait Locus (QTL) alleles for the improvement
of agronomic traits in the BC2DH population S42 derived from a cross between the spring barley cultivar Scarlett and the wild barley accession ISR42-8 (Hordeum vulgare ssp. spontaneum). QTLs were detected as a marker main effect and/or a marker × environment interaction effect (M × E) in a three-factorial ANOVA. Using field data of up to eight environments and genotype data of 98 SSR loci, we detected 86
QTLs for nine agronomic traits. At 60 QTLs the marker main effect, at five QTLs the M × E interaction effect, and at 21 QTLs both the effects were significant. The majority of the M × E interaction effects were due to changes in magnitude and are, therefore, still valuable for marker assisted selection across
environments. The exotic alleles improved performance in 31 (36.0%) of 86 QTLs detected for agronomic traits. The exotic alleles
had favourable effects on all analysed quantitative traits. These favourable exotic alleles were detected, in particular on
the short arm of chromosome 2H and the long arm of chromosome 4H. The exotic allele on 4HL, for example, improved yield by
7.1%. Furthermore, the presence of the exotic allele on 2HS increased the yield component traits ears per m2 and thousand grain weight by 16.4% and 3.2%, respectively. The present study, hence, demonstrated that wild barley does harbour
valuable alleles, which can enrich the genetic basis of cultivated barley and improve quantitative agronomic traits. 相似文献
17.
V TALAMÉ M C SANGUINETI E CHIAPPARINO H BAHRI M BEN SALEM B P FORSTER R P ELLIS S RHOUMA W ZOUMAROU R WAUGH R TUBEROSA 《The Annals of applied biology》2004,144(3):309-319
Advanced backcross QTL (AB-QTL) analysis was deployed to identify allelic variation in wild barley (Hordeum vulgare ssp. spontaneum) of value in the improvement of grain yield and other agronomically important traits in barley (Hordeum vulgare ssp. vulgare) grown under conditions of water deficit in Mediterranean countries. A population of 123 double haploid (DH) lines obtained from BC1F2 plants derived from a cross between Barke (European two-row cultivar) and HOR11508 (wild barley accession) were tested in replicated field trials, under varying conditions of water availability in Italy, Morocco and Tunisia, for seven quantitative traits. Significant QTL effects at one (P 0.001) or more trial sites (P 0.01) were identified for all traits. At 42 (52%) of the 80 putative QTLs identified, the allele increasing a “traits' value” was contributed by H. spontaneum. For example, though the majority (67%) of QTL alleles increasing grain yield were contributed by H. vulgare, H. spontaneum contributed the alleles increasing grain yield at six regions on chromosomes 2H, 3H, 5H and 7H. Among them, two QTLs (associated to Bmac0093 on chromosome 2H and to Bmac0684 on chromosome 5H) were identified in all three locations and had the highest additive effects. The present study shows the validity of deploying AB-QTL analysis for identifying favourable QTL alleles from wild germplasm and indicates its potential as an enhancement strategy for the genetic improvement of cultivars better adapted to drought-prone environments. 相似文献
18.
L. A. Marquez-Cedillo P. M. Hayes B. L. Jones A. Kleinhofs W. G. Legge B. G. Rossnagel K. Sato S. E. Ullrich D. M. Wesenberg North American Barley Genome Mapping Project 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2000,101(1-2):173-184
Characterization of the determinants of economically important phenotypes showing complex inheritance should lead to the more
effective use of genetic resources. This study was conducted to determine the number, genome location and effects of QTLs
determining malting quality in the two North American barley quality standards. Using a doubled-haploid population of 140
lines from the cross of Harrington×Morex, malting quality phenotype data sets from eight environments, and a 107-marker linkage
map, QTL analyses were performed using simple interval mapping and simplified composite interval mapping procedures. Seventeen
QTLs were associated with seven grain and malting quality traits (percentage of plump kernels, test weight, grain protein
percentage, soluble/total protein ratio, α-amylase activity, diastatic power and malt-extract percentage). QTLs for multiple
traits were coincident. The loci controlling inflorescence type [vrs1 on chromosome 2(2H) and int-c on chromosome 4(4H)] were coincident with QTLs affecting all traits except malt-extract percentage. The largest effect QTLs,
for the percentage of plump kernels, test weight protein percentage, S/T ratio and diastatic power, were coincident with the
vrs1 locus. QTL analyses were conducted separately for each sub-population (six-rowed and two-rowed). Eleven new QTLs were detected
in the subpopulations. There were significant interactions between the vrs1 and int-c loci for grain-protein percentage and S/T protein ratio. Results suggest that this mating of two different germplasm groups
caused a disruption of the balance of traits. Information on the number, position and effects of QTLs determining components
of malting quality may be useful for maintaining specific allele configurations that determine target quality profiles.
Received: 28 May 1999 / Accepted: 9 November 1999 相似文献
19.
Kiyosumi Hori Kazuhiro Sato Nami Nankaku Kazuyoshi Takeda 《Molecular breeding : new strategies in plant improvement》2005,16(4):295-311
Recombinant chromosome substitution lines (RCSLs) were developed in BC3 generation to introduce segments of a wild barley strain ‘H602’ (Hordeum vulgare ssp. spontaneum) into a barley cultivar ‘Haruna Nijo’ (H. vulgare ssp. vulgare) genetic background. One hundred thirty four RCSLs were genotyped by 25 SSR and 60 EST markers, which were localized on a
linkage map of doubled haploid lines (DHLs) derived from the same cross combination. Graphical genotyping revealed that the
observed average substitution ratio of H602 segment (12.9%) agreed with the expected substitution ratio (12.5%), and a minimum
set of 19 RCSLs represented the entire H602 genome. Phenotypes of five qualitative and nine quantitative traits were scored
in both the RCSLs and DHLs. Five qualitative traits were localized as morphological markers on the linkage map of the DHLs,
and these molecular markers were aligned on the respective chromosomal regions in the RCSLs. Simple and composite interval
mapping procedures detected a total of 18 and 24 QTLs for nine qualitative traits on the RCSLs and DHLs, respectively. Several
QTLs were localized at coincident or very close regions on both linkage maps. In spite of general inferior agronomic performances
in wild barley, several H602 QTL alleles showed agronomically positive effects. These RCSLs should contribute to substitution
of favorable alleles from wild barley into cultivated barley. These RCSLs are also available as sources of near isogenic lines,
with which we can apply advanced genetic analysis methods such as isolation of QTLs and detection of epistatic interactions
among QTLs. 相似文献
20.
Drought is one of the most severe stresses, endangering crop yields worldwide. In order to select drought tolerant genotypes, access to exotic germplasm and efficient phenotyping protocols are needed. In this study the high-throughput phenotyping platform “The Plant Accelerator”, Adelaide, Australia, was used to screen a set of 47 juvenile (six week old) wild barley introgression lines (S42ILs) for drought stress responses. The kinetics of growth development was evaluated under early drought stress and well watered treatments. High correlation (r = 0.98) between image based biomass estimates and actual biomass was demonstrated, and the suitability of the system to accurately and non-destructively estimate biomass was validated. Subsequently, quantitative trait loci (QTL) were located, which contributed to the genetic control of growth under drought stress. In total, 44 QTL for eleven out of 14 investigated traits were mapped, which for example controlled growth rate and water use efficiency. The correspondence of those QTL with QTL previously identified in field trials is shown. For instance, six out of eight QTL controlling plant height were also found in previous field and glasshouse studies with the same introgression lines. This indicates that phenotyping juvenile plants may assist in predicting adult plant performance. In addition, favorable wild barley alleles for growth and biomass parameters were detected, for instance, a QTL that increased biomass by approximately 36%. In particular, introgression line S42IL-121 revealed improved growth under drought stress compared to the control Scarlett. The introgression line showed a similar behavior in previous field experiments, indicating that S42IL-121 may be an attractive donor for breeding of drought tolerant barley cultivars. 相似文献