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United States Department of Agriculture

Agricultural Research Service

Research Project: Conservation, Characterization, and Evaluation of Plant Genetic Resources and Associated Information

Location: Plant Genetic Resources Conservation Unit

Title: Genetic diversity and population structure of castor germplasm within the U.S. collection

Authors
item Wang, Ming
item Dzievit, Matt -
item Chen, Zhenbang -
item Morris, John
item Barkley, Noelle
item Tonnis, Brandon
item Pederson, Gary
item Yu, Jianming -

Submitted to: Plant and Animal Genome Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: November 22, 2013
Publication Date: January 13, 2014
Citation: Wang, M.L., Dzievit, M., Chen, Z., Morris, J.B., Barkley, N.L., Tonnis, B.D., Pederson, G.A., Yu, J. 2014. Genetic diversity and population structure of castor germplasm within the U.S. collection [abstract]. Plant and Animal Genome Conference Proceedings.January 10-15, 2014, San Diego, California. Poster No. 1117.

Interpretive Summary: Castor is an important oilseed crop and its oil is inedible but has multiple industrial and pharmaceutical applications. Castor germplasm collection is a useful genetic resource for improving seed quality and developing new cultivars. Seed oil content and fatty acid composition of the entire U.S. castor germplasm collection were previously screened and determined. Significant variability in oil content and fatty acid composition were identified. However, the genetic diversity and population structure of this collection are not well assessed. The missed information can hinder castor breeding and germplasm management programs. Based on the screening results of oil content and fatty acid composition, 574 accessions were selected and genotyped with 22 polymorphic EST-SSR markers. Phylogenetic analysis partitioned accessions into four main clusters and structure analysis revealed four subpopulations. The results from phylogenetic and structure analyses were consistent. Both divergent and redundant accessions were identified in this study. The results obtained here will be useful for choosing accessions as parents to make crosses in breeding programs, prioritizing regeneration of accessions for distribution, and establishing a core collection in germplasm managing programs.

Technical Abstract: Castor is an important oilseed crop and its oil is inedible but has multiple industrial and pharmaceutical applications. Castor germplasm collection is a useful genetic resource for improving seed quality and developing new cultivars. Seed oil content and fatty acid composition of the entire U.S. castor germplasm collection were previously screened and determined. Significant variability in oil content and fatty acid composition were identified. However, the genetic diversity and population structure of this collection are not well assessed. The missed information can hinder castor breeding and germplasm management programs. Based on the screening results of oil content and fatty acid composition, 574 accessions were selected and genotyped with 22 polymorphic EST-SSR markers. Phylogenetic analysis partitioned accessions into four main clusters and structure analysis revealed four subpopulations. The results from phylogenetic and structure analyses were consistent. Both divergent and redundant accessions were identified in this study. The results obtained here will be useful for choosing accessions as parents to make crosses in breeding programs, prioritizing regeneration of accessions for distribution, and establishing a core collection in germplasm managing programs.

Last Modified: 10/21/2014
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