Chromosome studies along with heterochromatin distribution pattern analysis have been carried out in two domesticated species of Vigna Savi, 1824 which grow in contrasting geo-climatic conditions of India: Vigna
umbellata Thunberg, 1969, a legume well acclimatized to subtropical hilly regions of North-east India and Vigna
aconitifolia Jacquin, 1969, a species of arid and semi-arid regions in desert plains of Western India. Karyo-morphological studies in both species reveal 2n = 22 chromosomes without any evidence of numerical variation and the overall karyotype symmetry in chromosome morphology suggest that the diversification at intraspecific level in genus Vigna has occurred through structural alteration of chromosomes, rather than numerical changes. Heterochromatin distribution as revealed by fluorochrome binding pattern using CMA3 and DAPI, confirms the occurrence of relatively more GC content in Vigna
aconitifolia as compared to Vigna
umbellata. However, AT content was found to be comparatively higher in Vigna
umbellata which perhaps play a role in species interrelationships.
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