SSR genetic diversity assessment of popular pigeonpea varieties in Malawi reveals unique fingerprints

Njung'e, V and Deshpande, S and Siambi, M and Jones, R and Silim, S and De Villiers, S (2016) SSR genetic diversity assessment of popular pigeonpea varieties in Malawi reveals unique fingerprints. Electronic Journal of Biotechnology, 21. pp. 65-71. ISSN 0717-3458

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Abstract

Background: Pigeonpea (Cajanus cajan (L.) Millsp.) is a drought tolerant legume of the Fabaceae family and the only cultivated species in the genus Cajanus. It is mainly cultivated in the semi-arid tropics of Asia and Oceania, Africa and America. In Malawi, it is grown as a source of food and income and for soil improvement in intercropping systems. However, varietal contamination due to natural outcrossing causes significant quality reduction and yield losses. In this study, 48 polymorphic SSR markers were used to assess the diversity among all pigeonpea varieties cultivated in Malawi to determine if a genetic fingerprint could be identified to distinguish the popular varieties. Results A total of 212 alleles were observed with an average of 5.58 alleles per marker and a maximum of 14 alleles produced by CCttc019 (Marker 40). Polymorphic information content (PIC), ranged from 0.03 to 0.89 with an average of 0.30. A neighbor-joining tree produced 4 clusters. The most commonly cultivated varieties, which include released varieties and cultivated land races, were well-spread across all the clusters observed, indicating that they generally represented the genetic diversity available in Malawi, although substantial variation was evident that can still be exploited through further breeding. Conclusion Screening of the allelic data associated with the five most popular cultivated varieties, revealed 6 markers – CCB1, CCB7, Ccac035, CCttc003, Ccac026 and CCttc019 – which displayed unique allelic profiles for each of the five varieties. This genetic fingerprint can potentially be applied for seed certification to confirm the genetic purity of seeds that are delivered to Malawi farmers.

Item Type: Article
Divisions: RP-Grain Legumes
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: Genetic variation; Genotyping; Microsatellites; Seed purity; Pigeonpea; SSR genetic diversity; Malawi
Subjects: Mandate crops > Pigeonpea
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 13 May 2016 09:05
Last Modified: 02 Feb 2017 09:07
URI: http://oar.icrisat.org/id/eprint/9517
Official URL: http://dx.doi.org/10.1016/j.ejbt.2016.02.004
Projects: UNSPECIFIED
Funders: Open Access funded by Pontificia Universidad Católica de Valparaíso
Acknowledgement: This project was funded by Irish Aid under the “Malawi Seed Industry Development Project” (2010/2011). The authors acknowledge technical assistance from Wilson Kimani and Geoffrey Meru.
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