JINU DEVI RAJKUMARI, KASHYAP DAS AND WERINA INGTIPI
Department of Botany, Faculty of Life Sciences, Cotton University, Guwahati-781 001 (Assam), India
*(e-mail : werinaingtipi@gmail.com; Mobile : 9435850443)
(Received: December 24, 2022; Accepted: February 2, 2023)
ABSTRACT
Karyotype analysis of three species of Zephyranthes Herb. showed extensive variation in chromosome numbers. Basic chromosome number was reported as x = 6. Somatic chromosome number 2n = 66, 72, 92 in Z. candida (Lindl.) Herb. and 2n = 14, 24, 32, 44 in Z. carinata Herb. were reported. While Z. tubispatha (LHer.) Herb. showed 2n = 44 and 2n = 75 chromosome numbers. Chromosomes in these three species of Zephyranthes Herb. differed in terms of their chromosome length (CL), centromeric index (CI), relative length percentage (RL%), etc. Chromosomes with secondary constrictions were found. Asymmetric indices like TF%, Ask%, A1, A2, A, CVCL, CVCI and AI were calculated and an attempt was made to infer the evolutionary status of the species.
Key words : Zephyranthes Herb., chromosome morphology, numerical chromosomal variation, karyotype asymmetry