共查询到20条相似文献,搜索用时 15 毫秒
1.
Scott M. Lacy David A. Cleveland Daniela Soleri 《Human ecology: an interdisciplinary journal》2006,34(3):331-353
In southern Mali and throughout the semiarid tropics, small-scale family farmers are faced with the challenge of producing adequate harvests in difficult biophysical and socioeconomic environments. Professional plant breeders have had much difficulty developing modern varieties that outperform farmers’ traditional varieties in these environments, in part because of an incomplete understanding of why farmers choose the varieties they grow. Improved understanding of farmers’ varietal choices can contribute to collaboration between farmers and formal plant breeders. Based on a 15-month field study in Dissan, Mali, we examine farmer's choices among their traditional sorghum varieties in terms of one or more than one variety, and short-cycle or long-cycle varieties, and the interaction between these two choices. Results support our general hypothesis that farmers choose varieties to optimize outputs in the face of variation in the growing environment and in human managed inputs such as labor and tools. 相似文献
2.
A. M. Thro W. M. Roca J. Restrepo H. Caballero S. Poats R. Escobar G. Mafla C. Hernandez 《In vitro cellular & developmental biology. Plant》1999,35(5):382-387
Summary Cassava is uniquely suited for food security and economic development in unfavored areas of the tropics. Development research
for cassava is an urgent need. In 1998, the Cassava Biotechnology Network (CBN) convened a workshop of cassava stakeholder
groups in Latin America. After hearing an opening statement from representatives of small-scale cassava producers and processors,
stakeholders formulated a consensus set of research and development (R&D) priorities. An adequate supply of good-quality planting
material of desired varieties was clearly the most urgent, followed by R&D on market-value traits; yield losses due to pests,
diseases, and drought; and cropping system flexibility.
Two new projects are using in vitro techniques to address priorities of small-scale cassava farmers in Latin America. One
project in Colombia combines a nongovernmental organization, a local farmers’ association, and the international research
center, CIAT, to explore affordable micropropagation. Findings to date show that most culture medium components can be replaced
with local products, and a rustic growth room permits good culture growth without electricity or air conditioning. Low-costs
system(s) developed will be assessed as a local microenterprise.
A second project, in Ecuador, couples local cassava germplasm (with oral histories and an in vitro back-up collection) and
elite clones (introduced in vitro) with new concepts in agribusiness development, to restart local farmers’ cooperatives after
the disastrous 1998–99 el Ni?o floods. The project was developed through group planning by the cooperatives, the local technical
university, the national agricultural research program, and CIAT.
Research to improve in vitro tools focuses on safe and stable conservation and exchange of cassava genetic resources, long-term,
less expensive conservation, rapid clonal propagation, and ultimately, genetic transformation technologies to add desired
traits to useful cassava varieties. 相似文献
3.
Alice G. Laborte Neale C. Paguirigan Piedad F. Moya Andrew Nelson Adam H. Sparks Glenn B. Gregorio 《PloS one》2015,10(8)
Many modern rice varieties (MVs) have been released but only a few have been widely adopted by farmers. To understand farmers’ preferences, we characterized MVs released in the Philippines from 1966 to 2013 and identified important characteristics of the varieties that were widely adopted in Central Luzon using farm surveys conducted in 1966–2012. We found that farmers adopt MVs that are high yielding, mature faster, and have long and slender grains, high milling recovery, and intermediate amylose content. The amylose content of adopted varieties has been declining, suggesting value in developing softer rice. To have a high potential for adoption, new MVs should have characteristics within the ranges of values observed for the adopted MVs. In addition, new MVs should have higher head rice recovery, less chalky grains, and better resistance to pests and diseases. Most MVs released in 2005–2013 compared poorly in these three traits. To reduce the risk of severe outbreaks, broad spectrum resistance should be incorporated into new MVs. This analysis of five decades of farm surveys provides insights into the varietal characteristics preferred by farmers which could contribute to the establishment of a product profile for developing improved MVs that are more targeted and, hence, would have high potential for adoption by farmers in Central Luzon and similar areas. We recommend a similar analysis be done in other major rice growing regions to aid the development of MVs that are more responsive to farmers’ needs and preferences. 相似文献
4.
Vulnerability in farmer seed systems: Farmer practices for coping with seed insecurity for sorghum in Eastern Ethiopia 总被引:2,自引:0,他引:2
Shawn J. McGuire 《Economic botany》2007,61(3):211-222
Many interventions try to address farmers’ seed insecurity, though few assess the causes of farmers’ vulnerability or understand
their coping strategies. This paper analyzes farmers’ practices for maintaining sorghum seed security in a specific season
(1998–99) in Ethiopia, which provides a richer picture of coping strategies than accounts of “general” practices, as it shows
how responses reflect events unfolding over time and household-specific situations. High seeding rates ensure against environmental
uncertainty, but not everyone has sufficient seed for repeated sowing should stands fail to establish. Off-farm seed fills
this gap, though payment is usually required for substantial quantities; only 20% of seed from other farmers came for free
in 1998. Differences between seed suppliers and recipients suggest indicators for chronic seed insecurity. The discussion
explores implications for supporting farmers’ coping strategies. Helping the poorest farmers access off-farm seed, from other
farmers or from merchants, can reduce their vulnerability. 相似文献
5.
Local cultivars adapted to specific environmental conditions are the chief source of seed for farmers in Ethiopia and deserve
research priority. The aim of this study was, therefore, to determine the genetic relationships between different barley landraces,
from north Shewa in Ethiopia so as to differentiate genotypes known by different local names and facilitate their conservation
and use in breeding new varieties. Five AFLP primer combinations were analyzed for 19 barley landraces and five malting varieties.
The number of scoreable fragments amplified by each AFLP primer combination varied from 49 to 118 with an average of 84.5
and polymorphic fragments for each primer combination varied from 27 to 77 with an average of 58.5. The average percent polymorphism
was 69.9% with values ranging from 55.1% to 75.8%. Cluster analysis placed the accessions and malting varieties into one main
group while all the farmers’ cultivars, with the exception of two, were in the other main group. It was shown that sampling
of germplasm at a given locality might not represent the whole array of genetic variability of locally grown famers’ cultivars.
A comprehensive study of all the farmers’ barley cultivars, grown in different parts of Ethiopia, is required to maximize
the efforts of germplasm conservation and utilization in national and regional breeding programs. 相似文献
6.
Avrum J. Shriar 《Human ecology: an interdisciplinary journal》2007,35(3):275-287
This article is based on a 2003 case study of the Special Program for Food Security in two dry, upland regions of Honduras
and Nicaragua. In particular the research sought to identify factors influencing farmers’ interest in various “best practices”
being promoted as alternatives to the use of fire in cropping and ranching systems. The economic feasibility and/or affordability
of several of these practices are questionable in light of most farmers’ priorities, risk concerns, or limited resources.
The technical feasibility of several of the practices is unclear, at least in the marginal agroecological environments in
which most of the farmers in these regions operate. The study highlights the weaknesses of agricultural development initiatives
designed without a sufficient understanding of existing agricultural strategies and their purposes. It also reveals the limitations
of technological approaches to problems of food insecurity and land degradation, and the need for broader, more integrated
rural development strategies. The findings support critiques regarding the biases of many development professionals that may
prevent them from giving sufficient attention to local knowledge and perspectives.
相似文献
Avrum J. ShriarEmail: |
7.
Scarcelli N Tostain S Vigouroux Y Luong V Baco MN Agbangla C Daïnou O Pham JL 《Genetica》2011,139(8):1055-1064
The relative role of sexual reproduction and mutation in shaping the diversity of clonally propagated crops is largely unknown.
We analyzed the genetic diversity of yam—a vegetatively-propagated crop—to gain insight into how these two factors shape its
diversity in relation with farmers’ classifications. Using 15 microsatellite loci, we analyzed 485 samples of 10 different
yam varieties. We identified 33 different genotypes organized in lineages supported by high bootstrap values. We computed
the probability that these genotypes appeared by sexual reproduction or mutation within and between each lineage. This allowed
us to interpret each lineage as a product of sexual reproduction that has evolved by mutation. Moreover, we clearly noted
a similarity between the genetic structure and farmers’ classifications. Each variety could thus be interpreted as being the
product of sexual reproduction having evolved by mutation. This highly structured diversity of farmer-managed varieties has
consequences for the preservation of yam diversity. 相似文献
8.
Taking into account local practices and indigenous knowledge in an emergency conservation context in Madagascar 总被引:1,自引:0,他引:1
Chloé N. Marie Nicole Sibelet Michel Dulcire Minah Rafalimaro Pascal Danthu Stéphanie M. Carrière 《Biodiversity and Conservation》2009,18(10):2759-2777
At the 5th World Parks Congress, held in Durban, South Africa in 2003, the President of Madagascar committed his government
to tripling the country’s protected zones over the next 5 years. The announcement reflected a desire to combine rapid conservation
efforts with sustainable development. Conservationists in Madagascar focused their attention on the endemic baobab tree, Adansonia grandidieri. This paper aims to identify the contradictions between the political emergency of the biodiversity conservation effort and
local development needs. Eighty-three semi-structured interviews were conducted in two villages near the protected area of
“Baobab Alley” in the Menabe region. Malagasy conservationists believed the area’s protected status would benefit the local
economy through eco-tourism. However, the conservation actions undertaken there display limited understanding of local dynamics
and conflict with farmers’ needs. To protect the baobabs, the government has prohibited rice cultivation without providing
compensation. We show that the multifunctional baobab tree is integrated into an agroforestry system and protected by farmers.
Based on these results, we address the issue of how to combine conservation and local development objectives through the involvement
of farmers and the recognition of local knowledge in tree management. We also demonstrate that an emergency approach to conservation
is not conducive to the successful integration of conservation and development. 相似文献
9.
Dynamic Management of Maize Landraces in Central Mexico 总被引:1,自引:0,他引:1
Conservationists of crop genetic resources have feared that in situ conservation was not viable for agriculture precisely
because of changes resulting from introduction of new varieties of existing crops, new crops, and new farm practices. In addition,
conservation within farming systems necessarily implies a constantly changing crop population resulting from the processes
of crop evolution. Even though in situ conservation of crop genetic resources is now generally understood to be dynamic, there
are few examples of how evolution takes place in farmers fields. This study describes several changes in maize landraces in
four communities along an altitude transect in Central Mexico (1200 to 2400 masl). While true modern varieties have not been
widely adopted in the study region, farmer management results in numerous changes in maize landrace populations. Five types
of dynamic management were observed: (1) purposeful hybridization between traditional and modern maize types, (2) possible
creation of a new maize landrace by directional selection of the progeny of hybridization between two traditional landraces,
(3) displacement of a local landrace by the introduction of a modern variety and a non-local landrace, (4) maintenance of
stable populations of a locally dominant landrace, and (5) market-driven selection for a minor variety. We concur that in
situ conservation of crops must be conceived as an open process where the objective is not to maintain historic varieties
or static genetic conditions. Rather, in situ conservation of crops is totally in the hands of the farmer, although interventions
may be designed to influence farmers’ management of agrobiodiversity. 相似文献
10.
In the sub-humid part of Burkina Faso, population growth, migrations and new marketing opportunities have induced rapid land-use
changes and social reorganization, leading to new approaches to natural resource management. The objective of this study was
to evaluate tree biodiversity parameters in agroforestry parklands (scattered trees in crop land) as population increases
and fallows become shorter. Out of about 100 tree species existing in the area, and 50 commonly found in traditional parklands,
only 3 indigenous and 2 non-native species hold a significant importance for farmers, all for their fruits. No indigenous
tree species are planted, but a few are protected when clearing the land. Planted cashew nut orchards develop rapidly and
are seen as a land tenure guarantee and an important source of income. Given these facts, the perspectives for tree biodiversity
management in farmers’ land may appear bleak. Yet, the importance given by farmers to specific tree products demonstrates
that trees do play a part in land development and farmers’ strategies. Existing practices of farmers show potential for improved
land-use and spatial patterning of the land, as revealed by emerging parklands and orchards. Our data do not confirm common
statements that migrant farmers do not manage the land as sustainably as native farmers do. Rather than trying to conserve
tree biodiversity as it is, researchers and developers should identify with farmers the complementarities between trees and
farms and promote tree biodiversity through existing practices. 相似文献
11.
Traditional and small-scale farmers may know of practices that control weedy species. When these species are also problematic
in restored or managed areas, a collection of this knowledge might assist control efforts. However, past criticisms of using
local ecological knowledge (LEK) from small-scale farmers state that small sample sizes and highly variable responses among
informants hinders LEK’s utility in management. Here I document weed-control knowledge held by New Jersey salt-hay farmers
to control common reed and adapt strategies to control its invasion in two restoration settings. Accounts indicated that repeated
cutting could eradicate the invasive, and subsequent experimental treatments in restoration settings demonstrated this technique
to be very effective. However, only one farmer knew of this technique, and this farmer’s accounts seemingly contradicted other
farmers’ accounts of cutting. This study demonstrates that small sample sizes and highly variable responses are more problematic
to studies of knowledge, per se, than in finding valuable knowledge, which simply must be held by a community member rather
than be common or well-distributed. 相似文献
12.
The role of local knowledge in determining shade composition of multistrata coffee systems in Chiapas,Mexico 总被引:2,自引:0,他引:2
Lorena Soto-Pinto Víctor Villalvazo-López Guillermo Jiménez-Ferrer Neptalí Ramírez-Marcial Guillermo Montoya Fergus L. Sinclair 《Biodiversity and Conservation》2007,16(2):419-436
This research explores interactions between farmers’ knowledge and socioeconomic circumstances and the floristic composition
of multistrata coffee plantations in Chiapas, Mexico. Interviews with 24 individual farmers with accompanying vegetation transects
and two community level participatory workshops were carried out. The frequency, density, dominance, utility and importance
value for all tree species surveyed were obtained. Farmers were grouped by cluster analysis on the basis of their land area,
time producing coffee and the age of their coffee farms but the dominant shade species in their coffee plantations was not
influenced by socioeconomic status (p<0.05). A total of 74 shade species were recorded and classified as temporary, suitable, or unsuitable as shade species by
farmers, based on attributes such as leaf phenology, foliage density, crown shape and the amount and timing of litter decomposition,
as well as their overall impact on coffee yield. Principal component and cluster analysis using these attributes confirmed
the consistency of the farmers’ classification system. A group of preferred species was identified, but less than half the
trees recorded on farms were of these species, showing that farmers retained a wide range of trees and shrubs in their plantations,
taking into account not only commercial interests but also their contribution to ecosystem functions. Farmers harnessed the
forces of secondary succession by retaining pioneers as temporary shade, knowing that they would naturally be succeeded, while
at the same time promoting and tolerating other longer living native species that they considered more suitable as coffee
shade. Managing diverse secondary succession instead of establishing monospecific shade was an efficient way for farmers to
achieve acceptable coffee yields while contributing to biodiversity and landscape conservation that could allow them access
to niche markets. 相似文献
13.
This study was undertaken to contribute to the sustainable management of yam (Dioscorea sp.) diversity in Benin. We surveyed 220 farms from eight different villages in the north part of Benin. We hypothesized
that the richness of yam cultivars is more related to farmers’ ethnic group than to their geographical location. Cultivar
diversity may differ from one ethnic group to another within a given area, but remains constant for a given ethnic group independent
of its geographical location. This study identified 182 yam cultivars in the region; however, only a few farmers on a very
small scale marginally produce more than 50% of that total richness. Cultivation practices as well as historical and socio-cultural
determinants played important roles in the creation and maintenance of yam diversity within each ethnic group. The Bariba
and the Gando ethnic groups, having developed yam cultivation since time immemorial, still hold the most diverse collection
of yam varieties. The access of farmers to main roads and the availability of arable and in a given village greatly influenced
the overall yam diversity in the region. This study highlighted the need to combine social determinants and geographical patterns
in the conservation of agricultural diversity in Benin. 相似文献
14.
Peter O. Aikpokpodion Juan C. Motamayor Victor O. Adetimirin Yaw Adu-Ampomah Ivan Ingelbrecht Albertus B. Eskes Raymond J. Schnell Maria Kolesnikova-Allen 《Tree Genetics & Genomes》2009,5(4):699-711
Knowledge of genebank and on-farm genetic diversity, particularly in an introduced crop species, is crucial to the management
and utilization of the genetic resources available. Microsatellite markers were used to determine genetic diversity in 574
accessions of cacao, Theobroma cacao L., representing eight groups covering parental populations in West Africa, genebank, and farmers’ populations in Nigeria.
From the 12 microsatellite markers used, a total of 144 alleles were detected with a mean allelic richness of 4.39 alleles/locus.
The largest genetic diversity was found in the Upper Amazon parent population (H
nb
= 0.730), followed by the 1944 Posnette’s Introduction (H
nb
= 0.704), and was lowest in the Local parent population (H
nb
= 0.471). Gene diversity was appreciably high in the farmers’ populations (H
nb
= 0.563–0.624); however, the effective number of alleles was lower than that found in the genebank’s Posnette’s population.
Fixation index estimates indicated deficiency of heterozygotes in the Upper Amazon and the Local parent populations (F
is
= 0.209 and 0.160, respectively), and excess of heterozygotes in the Trinitario parent population (F
is
= −0.341). The presence of inbreeding in the Local parent populations and substructure (Wahlund effect) in the Upper Amazon
were suggested for the deficiency of heterozygotes observed. Non-significant genetic differentiation observed between the
genebank’s and farmers’ populations indicated significant impact of national breeding programs on varieties grown in farmers’
plantations. From this study, we showed that appreciable genetic diversity was present in on-farm and field genebank collections
of cacao that can be exploited for crop improvement in West Africa. Suggestions for future conservation of on-farm genetic
diversity and local landraces are further discussed. 相似文献
15.
Kenji Asano Ko Hirano Miyako Ueguchi-Tanaka Rosalyn B. Angeles-Shim Toshiro Komura Hikaru Satoh Hidemi Kitano Makoto Matsuoka Motoyuki Ashikari 《Molecular genetics and genomics : MGG》2009,281(2):223-231
sd1 is known as the ‘green revolution’ gene in rice because its application in rice breeding has dramatically increased rice
yield. Since the ‘green revolution,’ sd1 has been extensively used to produce modern semi-dwarf varieties. The extensive use of limited dwarfing sources may, however,
cause a bottleneck effect in the genetic background of rice varieties. To circumvent this problem, novel and useful sources
of dwarf genes must be identified. In this study, we identified three semi-dominant dwarf mutants. These mutants were categorized
as dn-type dwarf mutants according to the elongation pattern of internodes. Gibberellin (GA) response tests showed that the mutants
were still responsive to GA, although at a reduced rate. Map-based cloning revealed that the dwarf phenotype in these mutants
was caused by gain-of-function mutations in the N-terminal region of SLR1. Degradation of the SLR1 protein in these mutants
occurred later than in the wild type. Reduced interaction abilities of the SLR1 protein in these mutants with GID1 were also
observed using the yeast two-hybrid system. Crossing experiments indicated that with the use of an appropriate genetic background,
the semi-dominant dwarf alleles identified in this study could be used to alleviate the deficiency of dwarfing genes for breeding
applications. 相似文献
16.
农作物遗传多样性农家保护的现状及前景 总被引:31,自引:1,他引:31
农作物地方品种的有效保护是农业生物多样性的可持续利用的基础。由于现代农业的集约化生产方式使大量农作物地方品种被少数高产改良品种所取代,造成农作物基因库的严重“基因流失”(genetic erosion)。农家保护是在农业生态系统中进行的动态保护,被保护的生物多亲性可在其生境中继续进化而产生新的遗传变异,在而是农业生物多样性就地保护的重要途径。然而,尽管人们对作物品种资源农家保护的兴趣不断增长,也有大量有关农家的保护的研究和案例分析,但目前为止还没有比较成功的农家保护实例报道。因此,对农家保护的机制及科学问题进行深入的研究,并寻求一条新的途径来充分发挥农家保护应有的作用,显得格外重要。利用生物多样性布局的水稻混合间栽的生产模式,不仅解决了病害控制的问题,而且也保护了水稻地方品种的多样性。这种混合间栽的生物多样性布局和生产方式可能成为农保护的一条新途径。 相似文献
17.
M. D. Bezugliy Yu. M. Sivolap A. V. Galaev V. V. Dudchenko R. A. Vozhegova 《Cytology and Genetics》2011,45(1):27-32
Genetic diversity assessment in 11 rice varieties of the Rice Research Institute’ (Ukrainian Academy of Agrarian Sciences)
and also differentiation and identification of 11 rice varieties were conducted by the analysis of 25 SSR-markers. Based on
the allele composition of 12 polymorphic microsatellite loci, genetic formulas of examined varieties were developed. UPGMA cluster analysis, with the use of the genetic distances method, allowed for the calculation of differentiation of rice varieties
and showed that the Ukrainian rice varieties are genetically similar. As a whole, the use of the SSR-markers was revealed
as an effective tool for the assessment of genetic diversity and genotyping within rice varieties of Ukrainian breeding. 相似文献
18.
Localization of the rice stripe disease resistance gene, Stv-bi, by graphical genotyping and linkage analyses with molecular markers 总被引:4,自引:0,他引:4
Y. Hayano-Saito T. Tsuji K. Fujii K. Saito M. Iwasaki A. Saito 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1998,96(8):1044-1049
We used graphical genotyping and linkage analyses with molecular markers to determine the chromosomal location of the rice
stripe disease resistance gene, Stv-b
i
. The stripe resistance gene from the indica rice (Oryza sativa) cv ‘Modan’ was introgressed into several Japanese rice varieties. We found 4 RFLP markers in ‘Modan’, five susceptible parental
rice varieties (‘Norin No. 8’, ‘Sachihikari’, ‘Kanto No. 98’, ‘Hokuriku No.103’ and ‘Koganebare’) and four resistant progeny
varieties (‘St. No. 1’, ‘Aichi No. 6’, ‘Aoisora’ and ‘Asanohikari’). Graphical genotyping of the resistant progeny revealed
a chromosomal segment ascribable to ‘Modan’ and associated with stripe resistance. The chromosomal segment from ‘Modan’ was
located at 35.85 cM on chromosome 11. Linkage analysis using 120 F2 individuals from a cross between ‘Koshihikari’ (susceptible) and ‘Asanohikari’ (resistant) revealed another 8 RFLP markers
in the same chromosome. We performed a bioassay for rice stripe resistance in F3 lines of the F2 individuals using infective small brown planthoppers and identified an 1.8-cM segment harboring the rice stripe disease resistance
gene, Stv-b
i
, between XNpb220 and XNpb257/ XNpb254. Furthermore, Stv-b
i
was linked by 0.0 cM to a RFLP marker, ST10, which was developed on the basis of the results of RAPD analysis. These DNA
markers near the Stv-b
i
locus may be useful in marker-assisted selection and map-based cloning of the Stv-b
i
gene.
Received: 26 September 1997 / Accepted: 4 November 1997 相似文献
19.
Béla Teeken Edwin Nuijten Marina Padr?o Temudo Florent Okry Alfred Mokuwa Paul C. Struik Paul Richards 《Human ecology: an interdisciplinary journal》2012,40(6):879-892
Rice breeding and crop research predominantly emphasize adaptation to ecological conditions. Based on qualitative and quantitative research conducted between 2000 and 2012 we show how ecological factors, combined with socioeconomic variables, cultural norms and values, shape the use and development of local technologies related to the cultivation of African rice (Oryza glaberrima Steud.) in seven West African countries (Ghana, Guinea, Guinea-Bissau, Senegal, Sierra Leone, The Gambia and Togo). In this region the role of African rice is diverse across ethnic groups. Findings suggest that farmers, through various pathways, are active in the development of promising new varieties based on genetic resources of Asian rice, African rice, or both, as well as in the adoption of modern varieties. These findings require further research into interactions among ecological, genetic, socioeconomic and cultural factors within farmers?? innovation systems and recognition of emergent knowledge and technologies resulting from such interactions. 相似文献
20.
A. H. Price A. D. Tomos D. S. Virk 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1997,95(1-2):132-142
Root growth is an important component of the adaptation of rice to drought-prone environments. A hydroponic screen was used
to study root growth of 28 rice varieties. Both maximum root length and adventitious root thickness varied widely between
varieties. In general, japonica varieties had larger root systems than indica varieties. Two F2 populations involving the thick- and long-rooted upland japonica variety ‘Azucena’ and two poor-rooting varieties, namely the upland indica‘Bala’ and the Italian japonica‘Maratelli’, were made and screened in hydroponics. Generation means analysis revealed significant additive and dominance
main effects for the root length traits with a prevalence of dominance gene effects in both crosses. The dominance×dominance
type of non-allelic interactions were important for maximum root length from day 7 to day 28, root volume, root thickness
and root cell length in the cross ‘Bala’בAzucena’. The heritability (broad-sense) estimates varied from low to high for the
traits and displayed differences between populations. This suggested that recombinant lines with improved root traits can
be developed from the two crosses with selection methods that involve some form of progeny evaluation. In a companion paper,
we report the mapping of quantitative trait loci (QTLs) for root growth traits in the ‘Bala’בAzucena’ population using restriction
fragment length polymorphisms (RFLPs).
Received: 5 May 1996 / Accepted: 14 February 1997 相似文献