Single nucleotide polymorphisms for assessing genetic diversity in castor bean (Ricinus communis)
- Northern Arizona Univ., Flagstaff, AZ (United States). Center for Microbial Genetics and Genomics; DOE/OSTI
- Northern Arizona Univ., Flagstaff, AZ (United States). Dept. of Biological Sciences. Environmental Genetics and Genomics Lab.
- J. Craig Venter Inst., Inc., Rockville, MD (United States)
- J. Craig Venter Inst., Inc., Rockville, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). School of Medicine. Inst. for Genome Sciences; Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). School of Medicine. Dept. of Biochemistry Molecular Biology
- J. Craig Venter Inst., Inc., Rockville, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). School of Medicine. Inst. for Genome Sciences; Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). School of Medicine. Dept. of Microbiology Immunology
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Defense Biology Division
- Northern Arizona Univ., Flagstaff, AZ (United States). Center for Microbial Genetics and Genomics
Background: Castor bean (Ricinus communis) is an agricultural crop and garden ornamental that is widely cultivated and has been introduced worldwide. Understanding population structure and the distribution of castor bean cultivars has been challenging because of limited genetic variability. We analyzed the population genetics of R. communis in a worldwide collection of plants from germplasm and from naturalized populations in Florida, U.S. To assess genetic diversity we conducted survey sequencing of the genomes of seven diverse cultivars and compared the data to a reference genome assembly of a widespread cultivar (Hale). We determined the population genetic structure of 676 samples using single nucleotide polymorphisms (SNPs) at 48 loci. Results: Bayesian clustering indicated five main groups worldwide and a repeated pattern of mixed genotypes in most countries. High levels of population differentiation occurred between most populations but this structure was not geographically based. Most molecular variance occurred within populations (74%) followed by 22% among populations, and 4% among continents. Samples from naturalized populations in Florida indicated significant population structuring consistent with local demes. There was significant population differentiation for 56 of 78 comparisons in Florida (pairwise population ΦPT values, p < 0.01). Conclusion: Low levels of genetic diversity and mixing of genotypes have led to minimal geographic structuring of castor bean populations worldwide. Relatively few lineages occur and these are widely distributed. Our approach of determining population genetic structure using SNPs from genome-wide comparisons constitutes a framework for high-throughput analyses of genetic diversity in plants, particularly in species with limited genetic diversity.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1626501
- Journal Information:
- BMC Plant Biology, Journal Name: BMC Plant Biology Journal Issue: 1 Vol. 10; ISSN 1471-2229
- Publisher:
- BioMed CentralCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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