Assessment of Genetic Divergence in among Yard Long Bean (Vigna unguiculata subsp. sesquipedalis [L.]) Genotypes  

Siva Kumar Vavilapalli1 , Celine V.A.2 , Vahab A.M2
1. Department of Horticulture, Dr. Y.S.R. Horticultural University, Tadepalligudem, West Godavari- 534101, A.P., India
2. Department of Olericulture, Kerala Agricultural University, College of Agriculture, Vellayani-695522, Trivandrum, Kerala, India
Author    Correspondence author
Legume Genomics and Genetics, 2014, Vol. 5, No. 1   doi: 10.5376/lgg.2014.05.0001
Received: 12 Jan., 2014    Accepted: 13 Mar., 2014    Published: 14 Jun., 2014
© 2014 BioPublisher Publishing Platform
This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract

Forty four genotypes of yard long bean (Vigna unguiculata subsp. sesquipedalis (L.) Verd.) were investigated to understand the extent of genetic diversity through twelve quantitative traits. Mahalanobis’s D2 analysis established the presence of wide genetic diversity among these genotypes by the formation of 3 clusters. Cluster I had the maximum number of genotypes i.e 34 and cluster III had only four genotypes. Intra cluster distance analysis revealed that the minimum intra cluster distance was observed in the cluster I. The  inter-cluster  distance  (D)  was  found  to  be  the  maximum  between  the  clusters  II  and  III  and  the same  was minimum  between  clusters  I and  II. The results indicated that 100 seed weight contributed maximum to the total divergence followed by pod yield per plant. Intercrossing among the genotypes belonging to cluster II, V and IV was suggested to develop high yielding varieties with other desirable characters or may be used as potential donors for future hybridization programme to develop superior yard long bean variety with good consumer preference and high pod yield.

Keywords
D2 statistics; Genetic diversity; Vigna unguiculata ssp. sesquipedalis; Yard long bean
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