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1.
Lee GJ Carter TE Villagarcia MR Li Z Zhou X Gibbs MO Boerma HR 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2004,109(8):1610-1619
Deployment of salt tolerant cultivars is an effective approach to minimize yield loss in a saline soil. In soybean, Glycine max (L.) Merr., substantial genetic variation exists for salt response. However, breeding for salt tolerance is hampered because no economically viable screening method has been developed for practical breeding. To facilitate the development of an effective screening method for salt tolerance in soybean, the present study was conducted to determine the heritability of salt tolerance and to identify associated quantitative trait loci (QTL). F2:5 lines from the cross of S-100 (salt tolerant) × Tokyo (salt sensitive) were evaluated in a saline field in Hyde County, N.C., USA, in 1999 and in a greenhouse located in Raleigh, N.C., USA, in 2001. S-100 and Tokyo are ancestors of popular soybean cultivars released for the southern USA. The visual salt tolerance ratings of the F2:5 lines ranged from 0 (complete death) to 5 (normal healthy appearance). The entry-mean heritability for salt tolerance was 0.85, 0.48, and 0.57 in the field (four replications), greenhouse (two replications), and combined environments, respectively. The genotypic correlation between field and greenhouse ratings was 0.55, indicating reasonably good agreement between the two screening environments. To identify QTL associated with salt tolerance, each line was characterized with RFLP markers and an initial QTL single-factor analysis was completed. These results were used to identify genomic regions associated with the trait and to saturate the selected genomic regions with SSR markers to improve mapping precision. Subsequently, a major QTL for salt tolerance was discovered near the Sat_091 SSR marker on linkage group (LG) N, accounting for 41, 60, and 79% of the total genetic variation for salt tolerance in the field, greenhouse, and combined environments, respectively. The QTL allele associated with tolerance was derived from S-100. Pedigree tracking was used to examine the association between the salt tolerance QTL and flanking SSR marker alleles in U.S. cultivars descended from S-100 or Tokyo through 60 years of breeding. The presence of alleles from S-100 at the Sat_091 and Satt237 marker loci was always associated with salt tolerance in descendants. Alleles from Tokyo for these same markers were generally associated with salt sensitivity in descendent cultivars. The strong relationship between the SSR marker alleles and salt tolerance suggests that these markers could be used for marker-assisted selection in commercial breeding.An erratum to this article can be found at 相似文献
2.
Lee JM Nahm SH Kim YM Kim BD 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2004,108(4):619-627
Microsatellites or simple sequence repeats are highly variable DNA sequences that can be used as informative markers for the genetic analysis of plants and animals. For the development of microsatellite markers in Capsicum, microsatellites were isolated from two small-insert genomic libraries and the GenBank database. Using five types of oligonucleotides, (AT)15, (GA)15, (GT)15, (ATT)10 and (TTG)10, as probes, positive clones were isolated from the genomic libraries, and sequenced. Out of 130 positive clones, 77 clones showed microsatellite motifs, out of which 40 reliable microsatellite markers were developed. (GA)
n
and (GT)
n
sequences were found to occur most frequently in the pepper genome, followed by (TTG)
n
and (AT)
n
. Additional 36 microsatellite primers were also developed from GenBank and other published data. To measure the information content of these markers, the polymorphism information contents (PICs) were calculated. Capsicum microsatellite markers from the genomic libraries have shown a high level of PIC value, 0.76, twice the value for markers from GenBank data. Forty six microsatellite loci were placed on the SNU-RFLP linkage map, which had been derived from the interspecific cross between Capsicum annuum TF68 and Capsicum chinense Habanero. The current SNU2 pepper map with 333 markers in 15 linkage groups contains 46 SSR and 287 RFLP markers covering 1,761.5 cM with an average distance of 5.3 cM between markers.Communicated by J. Dvorak 相似文献
3.
Automated sizing of fluorescent-labeled simple sequence repeat (SSR) markers to assay genetic variation in soybean 总被引:15,自引:0,他引:15
N. Diwan P. B. Cregan 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1997,95(5-6):723-733
Simple Sequence Repeat (SSR) allele sizing provides a useful tool for genotype identification, pedigree analysis, and for
estimating genetic distance between organisms. Soybean [Glycine max (L.) Merr.] cultivars are identified for Plant Variety Protection (PVP) purposes by standard pigmentation and morphological
traits. However, many commercial soybeans arise from a limited number of elite lines and are often indistinguishable based
on these traits. A system based on SSR markers would provide unique DNA profiles of cultivars. Fluorescent labeling of alleles
combined with automated sizing with internal size standards in each gel lane was used as an alternative to standard [32P] labeling to assess genetic variability in soybean. Allelic frequencies at 20 SSR loci were determined in 35 soybean genotypes
that account for greater than 95% of the alleles in North American soybean cultivars based upon pedigree analysis. An average
of 10.1 alleles per locus (range: 5–17), with a mean gene diversity of 0.80 (range: 0.50 to 0.87) were observed at the 20
SSR loci. The 20 loci successfully distinguished modern soybean cultivars that are identical for morphological and pigmentation
traits, as well as 7 soybean genotypes reported to be indistinguishable using 17 RFLP probes. Pedigrees of 7 cultivars were
studied to estimate stability of SSRs in soybean across generations. Of the 7 pedigrees 6 had one locus in the progeny with
an allele(s) that was not present in either parent. These new alleles are most likely the result of mutation. The mutation
rate of SSR alleles in soybean was similar to that reported in humans. To avoid difficulty associated with mutation, DNA fingerprint
data should be determined from the bulk of 30-50 plants of a cultivar.
Received: 24 March 1997 / Accepted: 4 April 1997 相似文献
4.
Cleavage of lambda repressor and synthesis of RecA protein induced by transferred UV-damaged F sex factor 总被引:9,自引:0,他引:9
Summary Transfer of a UV-damaged F sex factor to a recipient lysogen induces prophage development. Under these conditions RecA protein synthesis was induced and repressor cleaved, as observed upon direct induction, that is, when the recipient lysogen was directly exposed to UV-light. The efficiency of induction of RecA protein synthesis in recipient bacteria which had received an irradiated F-lac factor was about 80% of that measured upon direct induction. We observed the simultaneous disappearance of repressor and a slight production of cleavage fragments; quantitation by densitometric scanning of the autoradiogram after correction for the efficiency of transfer indicated that 55% of repressor was cleaved. Transfer of UV-damaged Hfr DNA failed to induce RecA protein synthesis. A phage vector carrying oriF, the cloned origin of F plasmid replication, after exposure to UV-light and infection of a recipient lysogen, induced RecA protein synthesis and a moderate but significant cleavage of repressor. Indirect induction by UV-damaged F sex factor or phage oriF resulted in biochemical cellular reactions similar to those observed upon direct induction. LexA repressor that negatively controls RecA protein synthesis appeared more susceptible to cleavage than did repressor. 相似文献
5.
D. Dimitrova O. Georgiev C. Valkova B. Atanassova L. Karagyozov 《Biologia Plantarum》2008,52(1):149-152
Seven clones containing (CTG)n/(CAG)n repeats (n ≥ 4) were isolated by screening Lycopersicon esculentum genomic DNA. Four of the clones contained more than one simple sequence repeat (SSR). The SSRs were analyzed in several L. esculentum cultivars after polymerase chain reaction (PCR) amplification. No length variations were observed, suggesting considerable
locus stability. Five clones are from transcribed regions, which might explain the lack of cultivar variations. However the
conservation of CTG repeats was limited as differences in some transcribed loci were registered between L. pennellii and other Lycopersicon species. It is noted that in Lycopersicon trinucleotide repeat variation might be used for species identification. 相似文献
6.
Z.-W. Liu R. L. Jarret S. Kresovich R. R. Duncan 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1995,91(1):47-52
A size-fractionated TaqI genomic library of seashore paspalum (Paspalum vaginatum Swartz) was screened for the presence of (GA)
n
and (CA)
n
simple sequence repeats (SSRs). A total of 54 clones with a positive signal were detected among 13,000 clones screened. Forty-seven clones having repeats of n 3 were identified, of which 85% were perfect, 13% were imperfect and 2% were compound repeat sequences. Five of ten primer pairs synthesized to amplify selected loci resulted in a product in the expected size range and were subsequently used to examine SSR polymorphisms among 46 ecotypes of P. vaginatum. The number of alleles resolved on agarose or polyacrylamide gels were similar and ranged from 6 to 16 with an average of 14 per locus. Phenetic analysis of SSR polymorphisms revealed genetic relationships among the P. vaginatum ecotypes that were in general agreement with relationships determined previously by RAPD analysis of the same plant materials. Further screening of the genomic library did not identify (AT)
n
, trimeric or tetrameric repeats. Hybridization of an (ATT)8 oligonucleotide probe to genomic DNA isolated from I. batatas, E. coli, Citrullis lanatus and P. vaginatum suggested that the P. vaginatum genome contained significantly fewer ATT repeats than either the I. batatas or C. lanatus genome. 相似文献
7.
Characterization of trinucleotide SSR motifs in wheat 总被引:21,自引:0,他引:21
Song QJ Fickus EW Cregan PB 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2002,104(2-3):286-293
Length differences among trinucleotide-based microsatellite alleles can be more easily detected and frequently produce fewer
”stutter bands” as compared to dinucleotide-based microsatellite markers. Our objective was to determine which trinucleotide
motif(s) would be the most-polymorphic and abundant source of trinucleotide microsatellite markers in wheat (Triticum aestivum L.). Four genomic libraries of cultivar ’Chinese Spring’ were screened with nine trinucleotide probes. Based on the screening
of 28550 clones, the occurrences of (CTT/GAA)
n
, (GGA/CCT)
n
, (TAA/ATT)
n
, (CAA/GTT)
n
, (GGT/CCA)
n
, (CAT/GTA)
n
, (CGA/GCT)
n
, (CTA/GAT)
n
, and (CGT/GCA)
n
repeats were estimated to be 5.4×104, 3.5×104, 3.2×104, 1.2×104, 6.3×103, 4.9×103, 4.5×103, 4.5×103 and 3.6×103, i.e., once every 293 kbp, 456 kbp, 500 kbp, 1.3 Mbp, 2.6 Mbp, 3.2 Mbp, 3.6 Mbp, 3.6 Mbp and 4.5 Mbp in the wheat genome,
respectively. Of 236 clones selected for sequencing, 38 (93%) (TAA/ATT)
n
, 30 (43%) (CTT/GAA)
n
, 16 (59%) (CAA/GTT)
n
, 3 (27%) (CAT/GTA)
n
and 2 (4%) (GGA/CCT)
n
clones contained microsatellites with eight or more perfect repeats. From these data, 29, 27 and 16 PCR primer sets were
designed and tested to the (TAA/ATT)
n
, (CTT/GAA)
n
and (CAA/GTT)
n
microsatellites, respectively. A total of 12 (41.4%) primers designed to (TAA/ATT)
n
, four (14.8%) to (CTT/GAA)
n
, and two (12.5%) to (CAA/GTT)
n
resulted in polymorphic markers. The results indicated that (TAA/ATT)
n
microsatellites would provide the most-abundant and the most-polymorphic source of trinucleotide microsatellite markers in
wheat.
Received: 17 February 2001 / Accepted: 31 May 2001 相似文献
8.
Zou JJ Singh RJ Hymowitz T 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2004,109(4):769-774
Wild perennial Glycine species are an invaluable gene resource for the cultivated soybean [Glycine max (L.) Merr., 2n=40]. However, these wild species have been largely unexplored in soybean breeding programs because of their extremely low crossability with soybean and the need to employ in vitro embryo rescue methods to produce F1 hybrids. The objective of this study was to develop molecular markers to identify gene introgression from G. tomentella, a wild perennial Glycine species, to soybean. A selection of 96 soybean simple sequence repeat (SSR) markers was evaluated for cross-specific amplification and polymorphism in G. tomentella. Thirty-two SSR markers (33%) revealed specific alleles for G. tomentella PI 483218 (2n=78). These SSR markers were further examined with an amphidiploid line (2n=118) and monosomic alien addition lines (MAALs), each with 2n=40 chromosomes from soybean and one from G. tomentella. The results show that the use of SSR markers is a rapid and reliable method to detect G. tomentella chromosomes in MAALs. We also developed a cleaved amplification polymorphism sequence (CAPS) marker according to the sequences of internal transcribed spacer (ITS) regions in soybean and G. tomentella. Four MAALs that carry the ITS (rDNA) locus from G. tomentella were identified. The SSR and ITS-CAPS markers will greatly facilitate the introgression and characterization of gene transfer from G. tomentella to soybean.Communicated by F.J. Muehlbauer 相似文献
9.
Kishore VK Velasco P Shintani DK Rowe J Rosato C Adair N Slabaugh MB Knapp SJ 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2004,108(3):450-457
The Limnanthaceae (Order Brassicales) is a family of 18 taxa of Limnanthes (meadowfoam) native to California, Oregon, and British Columbia. Cultivated meadowfoam (L. alba Benth.), a recently domesticated plant, has been the focus of research and development as an industrial oilseed for three decades. The goal of the present research was to develop several hundred simple sequence repeat (SSR) markers for genetic mapping, molecular breeding, and genomics research in wild and cultivated meadowfoam taxa. We developed 389 SSR markers for cultivated meadowfoam by isolating and sequencing 1,596 clones from L. alba genomic DNA libraries enriched for AG
n
or AC
n
repeats, identifying one or more unique SSRs in 696 clone sequences, and designing and testing primers for 624 unique SSRs. The SSR markers were screened for cross- taxa utility and polymorphisms among ten of 17 taxa in the Limnanthaceae; 373 of these markers were polymorphic and 106 amplified loci from every taxon. Cross-taxa amplification percentages ranged from 37.3% in L. douglasii ssp. rosea (145/389) to 85.6% in L. montana (333/389). The SSR markers amplified 4,160 unique bands from 14 genotypes sampled from ten taxa (10.7 unique bands per SSR marker), of which 972 were genotype-specific. Mean and maximum haplotype heterozygosities were 0.71 and 0.90, respectively, among six L. alba genotypes and 0.63 and 0.93, respectively, among 14 genotypes (ten taxa). The SSR markers supply a critical mass of high-throughput DNA markers for biological and agricultural research across the Limnanthaceae and open the way to the development of a genetic linkage map for meadowfoam (x = 5).Electronic Supplementary Material Supplementary material is available in the online version of this article at
Communicated by O. Savolainen 相似文献
10.
We report the construction and characterization of the first soybean yeast artificial chromosome (YAC) library using high-molecular weight DNA isolated from leaf nuclei of the cultivar Conrad 94 that carries Phytophthora resistance genes Rps1-k and Rps6. The quality of this library has been evaluated through analysis of 393 randomly selected YAC clones. The library consists of 36,864 clones, of which 19,956 carry single soybean YACs with an average size of about 285 kb. The library represents approximately five soybean genome equivalents. The probability of finding any soybean sequences from this library is about 0.99. The library was screened for 43 SSR markers representing the whole soybean genome. We were able to identify positive YAC pools for 95% of the SSR markers. Two YAC clones carrying molecular markers linked to the Rps6 gene were identified. The YAC library reported here would be a useful resource for map-based cloning of agronomically important soybean genes and also to complement the effort towards construction of the physical map for the soybean genome. 相似文献
11.
Construction of BAC and BIBAC libraries and their applications for generation of SSR markers for genome analysis of chickpea, Cicer arietinum L. 总被引:3,自引:0,他引:3
Lichtenzveig J Scheuring C Dodge J Abbo S Zhang HB 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2005,110(3):492-510
Large-insert bacterial artificial chromosome (BAC) libraries, plant-transformation-competent binary BAC (BIBAC) libraries, and simple sequence repeat (SSR) markers are essential for many aspects of genomics research. We constructed a BAC library and a BIBAC library from the nuclear DNA of chickpea, Cicer arietinum L., cv. Hadas, partially digested with HindIII and BamHI, respectively. The BAC library has 14,976 clones, with an average insert size of 121 kb, and the BIBAC library consists of 23,040 clones, with an average insert size of 145 kb. The combined libraries collectively cover ca. 7.0× genomes of chickpea. We screened the BAC library with eight synthetic SSR oligos, (GA)10, (GAA)7, (AT)10, (TAA)7, (TGA)7, (CA)10, (CAA)7, and (CCA)7. Positive BACs were selected, subcloned, and sequenced for SSR marker development. Two hundred and thirty-three new chickpea SSR markers were developed and characterized by PCR, using chickpea DNA as template. These results have demonstrated that BACs are an excellent source for SSR marker development in chickpea. We also estimated the distribution of the SSR loci in the chickpea genome. The SSR motifs (TAA)n and (GA)n were much more abundant than the others, and the distribution of the SSR loci appeared non-random. The BAC and BIBAC libraries and new SSR markers will provide valuable resources for chickpea genomics research and breeding (the libraries and their filters are available to the public at ).J. Lichtenzveig and C. Scheuring contributed equally to this study. 相似文献
12.
Chengcheng Tan Yanqi Wu Charles M. Taliaferro Greg E. Bell Dennis L. Martin Mike W. Smith 《Molecular genetics and genomics : MGG》2014,289(4):523-531
Simple sequence repeat (SSR) markers are a major molecular tool for genetic and genomic research that have been extensively developed and used in major crops. However, few are available in African bermudagrass (Cynodon transvaalensis Burtt-Davy), an economically important warm-season turfgrass species. African bermudagrass is mainly used for hybridizations with common bermudagrass [C. dactylon var. dactylon (L.) Pers.] in the development of superior interspecific hybrid turfgrass cultivars. Accordingly, the major objective of this study was to develop and characterize a large set of SSR markers. Genomic DNA of C. transvaalensis ‘4200TN 24-2’ from an Oklahoma State University (OSU) turf nursery was extracted for construction of four SSR genomic libraries enriched with [CA] n , [GA] n , [AAG] n , and [AAT] n as core repeat motifs. A total of 3,064 clones were sequenced at the OSU core facility. The sequences were categorized into singletons and contiguous sequences to exclude redundancy. From the two sequence categories, 1,795 SSR loci were identified. After excluding duplicate SSRs by comparison with previously developed SSR markers using a nucleotide basic local alignment tool, 1,426 unique primer pairs (PPs) were designed. Out of the 1,426 designed PPs, 981 (68.8 %) amplified alleles of the expected size in the donor DNA. Polymorphisms of the SSR PPs tested in eight C. transvaalensis plants were 93 % polymorphic with 544 markers effective in all genotypes. Inheritance of the SSRs was examined in six F1 progeny of African parents ‘T577’ × ‘Uganda’, indicating 917 markers amplified heritable alleles. The SSR markers developed in the study are the first large set of co-dominant markers in African bermudagrass and should be highly valuable for molecular and traditional breeding research. 相似文献
13.
Shengrui Liu Yanlin An Fangdong Li Saijun Li Linlin Liu Qiying Zhou Shiqi Zhao Chaoling Wei 《Molecular breeding : new strategies in plant improvement》2018,38(5):59
The tea plant (Camellia sinensis (L.) O. Kuntze) is one of the most popular non-alcoholic beverage crops worldwide. The availability of complete genome sequences for the Camellia sinensis var. ‘Shuchazao’ has provided the opportunity to identify all types of simple sequence repeat (SSR) markers by genome-wide scan. In this study, a total of 667,980 SSRs were identified in the ~?3.08 Gb genome, with an overall density of 216.88 SSRs/Mb. Dinucleotide repeats were predominant among microsatellites (72.25%), followed by trinucleotide repeats (15.35%), while the remaining SSRs accounted for less than 13%. The motif AG/CT (49.96%) and AT/TA (40.14%) were the most and the second most abundant among all identified SSR motifs, respectively; meanwhile, AAT/ATT (41.29%) and AAAT/ATTT (67.47%) were the most common among trinucleotides and tetranucleotides, respectively. A total of 300 primer pairs were designed to screen six tea cultivars for polymorphisms of SSR markers using the five selected repeat types of microsatellite sequences. The resulting 96 SSR markers that yielded polymorphic and unambiguous bands were further deployed on 47 tea cultivars for genetic diversity assessment, demonstrating high polymorphism of these SSR markers. Remarkably, the dendrogram revealed that the phylogenetic relationships among these tea cultivars are highly consistent with their genetic backgrounds or places of origin. The identified genome-wide SSRs and newly developed SSR markers will provide a powerful means for genetic researches in tea plant, including genetic diversity and evolutionary origin analysis, fingerprinting, QTL mapping, and marker-assisted selection for breeding. 相似文献
14.
An integrated genetic linkage map of avocado 总被引:5,自引:0,他引:5
D. Sharon P. B. Cregan S. Mhameed M. Kusharska J. Hillel E. Lahav U. Lavi 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1997,95(5-6):911-921
An avocado genomic library was screened with various microsatellite repeats. (A/T)n and (TC/AG)n sequences were found to be the most frequent repeats. One hundred and seventy-two positive clones were sequenced successfully
of which 113 were found to contain simple sequence repeats (SSR). Polymerase chain reaction primers were designed to the regions
flanking the SSR in 62 clones. A GenBank search of avocado DNA sequences revealed 1 sequence containing a (CT)10 repeat. A total of 92 avocado-specific SSR markers were screened for polymorphism using 50 offspring of a cross between the
avocado cultivars ‘Pinkerton’ and ‘Ettinger’. Both are standard avocado cultivars which are normally outcrossed and highly
heterozygous. Fifty polymorphic SSR loci, 17 random amplified polymorphic DNA (RAPD) and 23 minisatellite DNA Fingerprint
(DFP) bands were used to construct the avocado genetic map. The resulting data were analyzed with various mapping programs
in order to assess which program best accommodated data from progeny of heterozygous parents. The analyses resulted in 12
linkage groups with 34 markers (25 SSRs, 3 RAPDs and 6 DFP bands) covering 352.6 cM. This initial map can serve as a basis
for developing a detailed genomic map and for detection of linkage between markers and quantitative trait loci.
Received: 2 April 1996 / Accepted: 28 February 1997 相似文献
15.
Akio Ohyama Kenta Shirasawa Hiroshi Matsunaga Satomi Negoro Koji Miyatake Hirotaka Yamaguchi Tsukasa Nunome Hiroyoshi Iwata Hiroyuki Fukuoka Takeshi Hayashi 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2017,130(8):1601-1616
Key message
Using newly developed euchromatin-derived genomic SSR markers and a flexible Bayesian mapping method, 13 significant agricultural QTLs were identified in a segregating population derived from a four-way cross of tomato.Abstract
So far, many QTL mapping studies in tomato have been performed for progeny obtained from crosses between two genetically distant parents, e.g., domesticated tomatoes and wild relatives. However, QTL information of quantitative traits related to yield (e.g., flower or fruit number, and total or average weight of fruits) in such intercross populations would be of limited use for breeding commercial tomato cultivars because individuals in the populations have specific genetic backgrounds underlying extremely different phenotypes between the parents such as large fruit in domesticated tomatoes and small fruit in wild relatives, which may not be reflective of the genetic variation in tomato breeding populations. In this study, we constructed F2 population derived from a cross between two commercial F1 cultivars in tomato to extract QTL information practical for tomato breeding. This cross corresponded to a four-way cross, because the four parental lines of the two F1 cultivars were considered to be the founders. We developed 2510 new expressed sequence tag (EST)-based (euchromatin-derived) genomic SSR markers and selected 262 markers from these new SSR markers and publicly available SSR markers to construct a linkage map. QTL analysis for ten agricultural traits of tomato was performed based on the phenotypes and marker genotypes of F2 plants using a flexible Bayesian method. As results, 13 QTL regions were detected for six traits by the Bayesian method developed in this study.16.
SSR mapping and confirmation of the QTL from PI96354 conditioning soybean resistance to southern root-knot nematode 总被引:6,自引:0,他引:6
Z. Li L. Jakkula R. S. Hussey J. P. Tamulonis H. R. Boerma 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2001,103(8):1167-1173
Root-knot nematodes (Meloidogyne spp.) can cause severe yield loss of soybean [Glycine max (L.) Merr.] in the southern production region of the USA. Planting root-knot nematode-resistant cultivars is the most effective
method of preventing yield loss. DNA marker-assisted breeding may accelerate the development of root-knot nematode-resistant
cultivars. RFLP markers have previously been used to identify quantitative trait loci (QTLs) conferring resistance to southern
root-knot nematode [Meloidogyne incognita (Kofoid and White) Chitwood] (Mi) in a F2:3 soybean population created by crossing the resistant PI96354 and the susceptible ’Bossier.’ A major QTL on linkage group
(LG) O conditioning 31% of the variation in Mi gall number and a minor QTL on LG-G conditioning 14% of the gall variation
were reported. With the development of SSR markers for soybean improvement, a higher level of mapping resolution and semi-automated
detection has become possible. The objectives of this research were: (1) to increase the marker density in the genomic regions
of the QTLs for Mi resistance on LG-O and LG-G with SSR markers; and (2) to confirm the effect of the QTLs in a second population
and a different genetic background. With SSR markers, the QTL on LG-O was flanked by Satt492 and Satt358, and on LG-G by Satt012
and Satt505. Utilizing SSR markers flanking the two QTLs, marker-assisted selection was performed in a second F2:3 population of PI96354× Bossier. Results confirmed the effectiveness of marker-assisted selection to predict the Mi phenotypes.
By screening the BC2F2 population of Prichard (3)×G93–9009 we confirmed that selection for the minor QTL on LG-G with flanking SSR markers would
enhance the resistance of lines containing the major QTL (which is most-likely Rmi1).
Received: 29 September 2000 / Accepted: 17 April 2001 相似文献
17.
Kumari Surbhi Krishna P. Singh Narendra K. Singh T. Aravind 《Journal of Phytopathology》2021,169(1):37-44
Forty‐seven genotypes and one wild relative of soybean, Glycine soja, were screened for resistance against aerial blight under epiphytotic conditions in the field during the Kharif season of two consecutive years viz., 2016 and 2017. Out of the 48 genotypes screened, only 18 genotypes exhibited a moderately resistant response to aerial blight during both the years of study. In order to perform molecular screening of the genotypes for aerial blight resistance, the genomic DNA obtained from the seedlings of the forty‐eight soybean genotypes was subjected to PCR amplification with 12 SSR markers. The SSR markers Satt 119, Sat_076, Satt 433, Satt 281, Satt 277, Satt 245 and Satt 520 were able to clearly amplify different banding pattern for resistant and susceptible genotypes, out of which Satt 433 and Satt 520 were found to exhibit a pattern, highly similar to the results of field screening of the genotypes with respect to resistant and susceptible reaction to the disease. The eighteen soybean genotypes that exhibited moderately resistant reaction to RAB under field conditions during both the years showed a banding pattern similar to resistant check PS‐1583 in the amplification profile produced by the SSR markers. The polymorphism information content (PIC) from the analysis of amplification profile of the SSR markers used in the study, ranged from 0.58 to 0.95. The dendrogram constructed using UPGMA cluster analysis clearly differentiated the resistant and susceptible genotypes of soybean into two separate groups. 相似文献
18.
A (GA)n and (GT)n microsatellite‐enriched library was constructed and 23 nuclear simple sequence repeat (SSR) loci were characterized in the guava species (Psidium guajava L.). All SSR loci were found to be polymorphic after screening for diversity in different cultivars, and across‐taxa amplification tests showed the potential transferability of most SSR markers in three other Psidium species. First to be published for P. guajava, this new SSR resource will be a powerful tool for genetic studies of guava, including cultivars identification and linkage mapping, as well as potentially for interspecific genetic studies within the genus Psidium. 相似文献
19.
Giriraj Kumawat Gourav Singh C. Gireesh M. Shivakumar Mamta Arya Dinesh K. Agarwal Syed Masroor Husain 《Physiology and Molecular Biology of Plants》2015,21(1):101-107
Molecular characterization and genetic diversity among 82 soybean accessions was carried out by using 44 simple sequence repeat (SSR) markers. Of the 44 SSR markers used, 40 markers were found polymorphic among 82 soybean accessions. These 40 polymorphic markers produced a total of 119 alleles, of which five were unique alleles and four alleles were rare. The allele number for each SSR locus varied between two to four with an average of 2.97 alleles per marker. Polymorphic information content values of SSRs ranged from 0.101 to 0.742 with an average of 0.477. Jaccard’s similarity coefficient was employed to study the molecular diversity of 82 soybean accessions. The pairwise genetic similarity among 82 soybean accessions varied from 0.28 to 0.90. The dendrogram constructed based on genetic similarities among 82 soybean accessions identified three major clusters. The majority of genotypes including four improved cultivars were grouped in a single subcluster IIIa of cluster III, indicating high genetic resemblance among soybean germplasm collection in India.
Electronic supplementary material
The online version of this article (doi:10.1007/s12298-014-0266-y) contains supplementary material, which is available to authorized users. 相似文献20.
Mian Wu Wen-Ping Wu Cheng-Chen Liu Ying-Na Liu Xiao-Yi Wu Fang-Fang Ma An-Qi Zhu Jia-Yin Yang Bin Wang Jian-Qun Chen 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2018,131(9):1851-1860