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Genetic diversity in pigeonpea [Cajanus cajan (L.) Millsp.] Landraces as revealed by simple sequence repeat markers

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Title Genetic diversity in pigeonpea [Cajanus cajan (L.)
Millsp.] Landraces as revealed by simple sequence
repeat markers
 
Creator Songok, S
Ferguson, M
Muigai, A W
Silim, S
 
Subject Pigeonpea
 
Description Genetic relationships among 88 pigeonpea accessions from a presumed centre of origin and diversity,
India and a presumed secondary centre of diversity in East Africa were evaluated using six
microsatellite markers. Forty-seven (47) alleles were detected in the populations studied, with a mean of
eight alleles per locus. Populations were defined by region (India and East Africa) and sub-populations
by country in the case of East Africa and State in the case of India. Substantial differentiation among
regions was evident from Roger’s modified distance and Wright’s F statistic. Greatest genetic diversity
in terms of number of alleles, number of rare alleles and Nei’s unbiased estimate of gene diversity (H)
was found in India as opposed to East Africa. This supports the hypothesis that India is the centre of
diversity and East Africa is a secondary centre of diversity. Within East Africa, germplasm from
Tanzania had the highest diversity according to Nei’s unbiased estimate of gene diversity, followed by
Kenya and Uganda. Germplasm from Kenya and Tanzania were more closely related than that of
Uganda according to Roger’s modified distance. Within India, results did not indicate a clear centre of
diversity. Values of genetic distance indicated that genetic relationships followed geographical
proximity.
 
Publisher Academic Journals
 
Date 2010
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/82/1/AfrJouBiot9_22_3231-3241_2010.pdf
Songok, S and Ferguson, M and Muigai, A W and Silim, S (2010) Genetic diversity in pigeonpea [Cajanus cajan (L.) Millsp.] Landraces as revealed by simple sequence repeat markers. African Journal of Biotechnology, 9 (22). pp. 3231-3241.