Heterochromatin distribution and comparative karyo-morphological studies in Vigna umbellata Thunberg, 1969 and V. aconitifolia Jacquin, 1969 (Fabaceae) accessions

By

Shamurailatpam, Anju
Madhavan, Latha
Yadav, Shrirang Ramachandra
Bhat, Kangila Venkatraman
Rama Rao, Satyawada

Type

Article

Date of Publication

2015

Original Publication

Comparative cytogenetics : international journal of plant & animal cytogenetics, karyosystematics and molecular systematics

Volume

9

Series / Issue

Issue: 1

Pages

119-132

Subjects

asymmetry index , C-heterochromatin , Fabaceae , karyotype , NOR-chromosomes , Vigna

Contributed by

Pensoft Publishers

Language

English

Published by

St. Petersburg, Russia [Published] with technical support of Zoological Institute RAS [2007]-

Identifiers

DOI: https://doi.org/10.3897/CompCytogen.v9i1.9012

 

Abstract

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 V. 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 V. aconitifolia as compared to V. umbellata. However, AT content was found to be comparatively higher in V. umbellata which perhaps play a role in species interrelationships.