Current status of crop plant germplasm

Wilkes, Garrison; Williams, J. T.

doi:10.1080/07352688309382175

Cited by 77 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The loss of genetic diversity, due to conventional breeding modern agricultural practices that promote monoculture has been dramatic for many cultivated species (Wilkes, 1983). As a better performing crop varieties are released by research institutions and agencies, farmers are encouraged to adopt the latter by extension services because of their higher profitability.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Genetic Variation of Cowpea Landraces (Vigna unguiculata) from Western Cameroon Using Qualitative Traits

et al. 2017

View full text Add to dashboard Cite

Characterization of the genetic diversity and analysis of the genetic relationship between accessions of a crop species is a key step in breeding superior cultivars. The main objective of the hereby study was to determine the genetic variation between 30 cowpea accessions collected throughout the eight divisions of the Western Region of Cameroon using qualitative traits. Phenotypic variation of these accessions was evaluated using diversity indices and cluster analyses. A total of twenty qualitative traits were used for the study. Fifteen of them (75%) were polymorphic, displaying each at least two phenotypic classes. The monomorphic characters were growth pattern, leaf color, leaf hairiness, plant hairiness and pod hairiness, each with only one phenotypic class. Results showed a relatively significant level of genetic diversity among the studied cowpea accessions. Overall, the average of the observed and effective number of phenotypic classes per qualitative trait were Na = 2.350 and Ne = 1.828 respectively. The Nei's genetic diversity and the Shannon weaver diversity index were He = 0.369, ranging from zero (monomorphic trait) to 0.655 (growth habit) and H' = 0.609, ranging from zero (monomorphic trait) to 0.996 (seed crowding), respectively. The dendrogram constructed from the twenty qualitative traits revealed 05 accessions clusters with the number of accessions in each cluster varying from one to eleven. Information obtained from this study is likely be useful for future cowpea breeding program.

show abstract

Section: Discussionmentioning

confidence: 99%

Evaluation of the Genetic Variation of Cowpea Landraces (Vigna unguiculata) from Western Cameroon Using Qualitative Traits

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The alarming rate of genetic erosion worldwide during the last half century has triggered national and international steps to collect and conserve genetic diversity of crop plants for future use (Wilkes, 1983;Williams, 1984;Frankel, 1985). Among others was the establishment of the International Board of Plant Genetic Resources (IBPGR) in 1974 which became the International Plant Genetic Resources Institute in 1994.…”

Section: Cul Tiv Ated Germplasmmentioning

confidence: 99%

Plant Evolution under Domestication

Ladizinsky

1998

214

127

View full text Add to dashboard Cite

“…The overall effect of plant breeding on genetic diversity has been a long‐standing concern in the evolutionary biology of crop plants (Simmonds, 1962). The loss of genetic diversity, in part due to the conventional breeding programs associated with modern agricultural practices, has been dramatic for many cultivated species (Wilkes, 1983). In consequence, the narrow genetic base of the elite germplasm has increased the potential vulnerability to pests and abiotic stress.…”

mentioning

confidence: 99%

Determining Genetic Similarities and Relationships among Cowpea Breeding Lines and Cultivars by Microsatellite Markers

et al. 2001

View full text Add to dashboard Cite

Cowpea [Vigna unguiculata (L.) Walp] is an important grain legume crop grown for its protein rich grains. It is an inexpensive source of protein in the diets of people in sub‐Saharan Africa. The International Institute of Tropical Agriculture (IITA) has been working on the improvement of cowpea for more than 30 yr. Over 60 countries receive cowpea cultivars improved by IITA for testing and adoption where needed. Many of these cultivars have identical parentage but look very different morphologically when grown in the field. Forty‐six microsatellite DNA markers were used to evaluate genetic similarities among 90 cowpea breeding lines developed at IITA. Twenty‐seven primer pairs could amplify polymorphic single‐locus microsatellites from all of these materials. Two to seven alleles per primer were detected with a polymorphic information content varying from 0.02 to 0.73. By means of only five polymorphic microsatellite primers, 88 of the 90 cowpea lines could be distinguished. A dendrogram based on the microsatellite polymorphisms generally agreed with the pedigree of the cowpea lines.

show abstract

Current status of crop plant germplasm

Cited by 77 publications

References 29 publications

Evaluation of the Genetic Variation of Cowpea Landraces (Vigna unguiculata) from Western Cameroon Using Qualitative Traits

Evaluation of the Genetic Variation of Cowpea Landraces (Vigna unguiculata) from Western Cameroon Using Qualitative Traits

Plant Evolution under Domestication

Determining Genetic Similarities and Relationships among Cowpea Breeding Lines and Cultivars by Microsatellite Markers

Contact Info

Product

Resources

About