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Genetic Patterns of Domestication in Pigeonpea (Cajanus cajan (L.) Millsp.) and Wild Cajanus Relatives

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Relation http://oar.icrisat.org/6018/
http://dx.doi.org/10.1371/journal.pone.0039563
 
Title Genetic Patterns of Domestication in Pigeonpea (Cajanus
cajan (L.) Millsp.) and Wild Cajanus Relatives
 
Creator Kassa, M T
Penmetsa, R V
Carrasquilla-Garcia, N
et al, .
 
Subject Pigeonpea
Genetics and Genomics
 
Description Pigeonpea (Cajanus cajan) is an annual or short-lived perennial food legume of acute regional importance, providing
significant protein to the human diet in less developed regions of Asia and Africa. Due to its narrow genetic base,
pigeonpea improvement is increasingly reliant on introgression of valuable traits from wild forms, a practice that would
benefit from knowledge of its domestication history and relationships to wild species. Here we use 752 single nucleotide
polymorphisms (SNPs) derived from 670 low copy orthologous genes to clarify the evolutionary history of pigeonpea (79
accessions) and its wild relatives (31 accessions). We identified three well-supported lineages that are geographically
clustered and congruent with previous nuclear and plastid sequence-based phylogenies. Among all species analyzed
Cajanus cajanifolius is the most probable progenitor of cultivated pigeonpea. Multiple lines of evidence suggest recent gene
flow between cultivated and non-cultivated forms, as well as historical gene flow between diverged but sympatric species.
Evidence supports that primary domestication occurred in India, with a second and more recent nested population
bottleneck focused in tropical regions that is the likely consequence of pigeonpea breeding. We find abundant allelic
variation and genetic diversity among the wild relatives, with the exception of wild species from Australia for which we
report a third bottleneck unrelated to domestication within India. Domesticated C. cajan possess 75% less allelic diversity
than the progenitor clade of wild Indian species, indicating a severe ‘‘domestication bottleneck’’ during pigeonpea
domestication.
 
Publisher PLoS ONE
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/6018/1/PloS_ONE_7_6_1-13_2012.pdf
Kassa, M T and Penmetsa, R V and Carrasquilla-Garcia, N and et al, . (2012) Genetic Patterns of Domestication in Pigeonpea (Cajanus cajan (L.) Millsp.) and Wild Cajanus Relatives. PLoS ONE, 7 (6). pp. 1-13. ISSN 1932-6203