Population structure and diversity in Valencia peanut germplasm collection

Kottapalli, P and Upadhyaya, H D and Kottapalli, K R and Payton, P and Dwivedi, S L and Burow, M and David, K O and Sanogo, S and Puppala, N (2011) Population structure and diversity in Valencia peanut germplasm collection. Crop Science, 51 (3). pp. 1089-1100.

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Valencia peanuts [Arachis hypogaea L. subsp. fastigiata Waldron var. fastigiata (Waldron) Krapov. & W. C. Greg.] are well known for their in-shell market value. Assessment of genetic diversity is key to the success of developing improved cultivars with desirable agronomic and quality traits. Seventy-eight U.S. Valencia core collection accessions together with 36 Valencia accessions representing the global peanut mini-core collection were used to study population structure and diversity and to identify genetically diverse Valencia germplasm for use in peanut breeding. Fifty-two simple sequence repeats loci amplifi ed 683 alleles, with an average of 13 alleles per locus. The mean polymorphism information content and gene diversity, respectively, were 0.270 and 0.335. The pairwise genetic distance ranged from 0.143 to 0.474, with an average of 0.631. Neighbor-joining clustering, principal coordinate analysis, and STRUCTURE analysis consistently separated the Valencia germplasm into fi ve clusters with two distinct major groups. The fi rst major group consisted of genotypes from South America (64%) with few accessions from Africa, North America, Caribbean, and European regions. The second group consisted of accessions mostly from diverse regions of Africa, North and South America, Asia, and the Caribbean. However, the structuring was not related to the geographic origin and several admixtures were observed. The information generated in this study and phenotyping of this material for biotic and abiotic stress responses and yield-quality traits will facilitate selection of trait-specifi c, genetically diverse parents for developing Valencia peanut cultivars with a broad genetic base.

Item Type: Article
Agro Tags: <b>Agrotags</b> - genetics | groundnuts | crops | germplasm | alleles | dna | planting | tillage equipment | genotypes | breeds (animals) <br><b>Fishtags</b> - NOT-AVAILABLE<br><b>Geopoliticaltags</b> - americas | south america | brazil | africa | paraguay | bolivia | asia | india | peru | caribbean
Subjects: Mandate crops > Groundnut
Depositing User: Users 6 not found.
Date Deposited: 25 Jul 2011 11:56
Last Modified: 28 Jul 2011 10:19
URI: http://oar.icrisat.org/id/eprint/110
Official URL: http://dx.doi.org/10.2135/cropsci2010.08.0452
Funders: New Mexico Peanut Research Board
Acknowledgement: The authors wish to thank Roy N. Pitman, USDA-ARS Plant Genetic Resources Unit, Griffi n, GA, for the germplasm. The authors also thank Halee Hughes, Jacob Sanchez, and Marie Syapin for their technical assistance. This research was supported in part by National Peanut Board, New Mexico Peanut Research Board, New Mexico Agricultural Experiment Station, USDA-ARS CRIS 6208-21000-012-00D, and USAID-Peanut CRSP through University of Georgia ECGA- 00-0700001-00.
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