S. Jena - Cytogenetics Laboratory, Regional Plant Resource Centre, Bhubaneswar ۷۵۱۰۱۵, Orissa, India
A. B. Das - Cytogenetics Laboratory, Regional Plant Resource Centre, Bhubaneswar ۷۵۱۰۱۵, Orissa, India

Chromosome number and karyotype analysis of five monocot mangrove associates from Dhamra and Paradeep coast of Orissa revealed ۲n=۴۸ in Porteresia coarctata; ۲n=۲۲ in Crinum defixum and Cryptocoryne ciliata and ۲n=۲۰ in Asparagus racemosus var. javanica and Cyperus cephalotes. Total chromosome length varied from ۴۲.۴۴ µm in A. racemosus var. javanica to ۹۳.۸۶ µm in C. defixum. Significant variation of chromosome volumes were also recorded among the species. The ۴C DNA content varied significantly from ۴۷.۱۵ pg in C. defixum to ۶.۳۱pg in C. cephalotes. A positive significant correlation between the chromosome volume and ۴C nuclear DNA content among five different species was revealed. The genome size was around ۱,۵۴۵ mbp in C. cephalotes to ۴,۰۷۴ mbp in P. coarctata with a highest size (۱۱,۵۵۱ mbp) in C. defixum that suggests the high repetitive DNA sequences in the Crinum with highest chromosome length and volume of this species.

genome size, Karyotype, somatic chromosome, Crinum, Cryptocoryne, Asparagus, Cyperus, Porteresia