Karyo-morphological characterization of natural genetic variation in some threatened Cymbidium species of Northeast India

摘要

Karyo-morphological studies have been carried out in three different species of the genus Cymbid-ium from North-eastern India. The somatic chromosome number (2n = 40) has been recorded in all the three species with distinct inter-specific variation in the arm ratio of few homologous pairs in the complements. The karyotypes of the species were more or less symmetrical. The significance of karyotypic variation in speciation of the genus Cymbidium has been discussed.