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

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.

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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.

Item Type: Article
Uncontrolled Keywords: Pigeonpea; genetic diversity; simple sequence repeat; India; East Africa
Agro Tags: <b>Agrotags</b> - alleles | genetics | locus | crops | genes | dna | population genetics | polymorphism | biodiversity | germplasm <br><b>Fishtags</b> - NOT-AVAILABLE<br><b>Geopoliticaltags</b> - india | africa | near east | east africa | uganda | kenya | tanzania | andhra pradesh | tamil nadu | gujarat
Subjects: Mandate crops > Pigeonpea
Depositing User: Users 6 not found.
Date Deposited: 14 Jun 2011 15:01
Last Modified: 02 Sep 2011 05:52
Official URL:
Funders: International Crops Research Institute for the Semi-Arid Tropics
Acknowledgement: The authors are grateful to ICRISAT for supplying seed and for financial support. This work was conducted at BioSciences Eastern and Central Africa / International Livestock Research Institute in Nairobi, Kenya.
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