DIVERSITY ANALYSIS AND ESTABLISHMENT OF CORE SUBSETS OF HYACINTH BEAN COLLECTION OF BANGLADESH
Md. Nazirul Islam*, M. Z. Rahman**, R. Ali***, A. K. Azad**** and M. K. Sultan**
Plant Genetic Resource Centre, Bangladesh Agricultural Research Institute, Gazipur, Bangladesh, maintained 484 hyacinth bean (Lablab purpureus L.) accessions. Distribution of vine colors, flower and pod colors, pod curvature and beak position on pod noticed the presence of substantial variation in the collection. Shannon Diversity Index also revealed high phenotypic diversity in vine and pod characters. High diversities were estimated in quantitative characters of inflorescence and pod characters. Considering a core collection strategy, the accessions were stratified into two groups based on vine colors: green and purple. Maximum genotypes of the collection were of green vine. Each of two subgroups were divided into three groups according to colors of pod i.e., green, white and red. Each group again divided itself into two according to beak position as central and marginal of pod. High diversity was also found regarding pod curvature and beak position on it. Strategically, a core subset consisting of 36 accessions out of 484 accessions was determined. Diversity Indices of different characters of the core accessions were of equal or higher magnitudes to the respective characters of base collection indicating the better representation of core to the original collection.