Chromosome number and meiotic behaviour of two populations of Onobrychis chorassanica Bunge (O. sect. Hymenobrychis) in Iran

Journal of Cell and Molecular Research

Article 7, Volume 2, Issue 1 - Serial Number 3, January 0, Pages 49-55   

DOI: 10.22067/jcmr.v2i1.7449

Authors

Masoud Ranjbar^* ; Roya Karamian; Fatemeh Hajmoradi

Abstract

The genus Onobrychis belongs to family Fabaceae and has about 130 species throughout the world.
Onobrychis sect. Hymenobrychis with nearly 14 species in Iran is one of the important sections of the genus.
The chromosome number and meiotic behaviour were studied in two populations of Onobrychis chorassanica
belonging to this section native to Iran. This report is the first cytogenetic analysis of this taxon. Both
populations are diploid and possess 2n = 2x = 14 chromosome number, consistent with the proposed base
number of x = 7. Although these taxa displayed regular bivalent pairing and chromosome segregation at
meiosis, some meiotic abnormalities were observed. The meiotic abnormalities included varied degrees of
chromosome stickiness including B-chromosome, cytomixis, asynchronous nucleus, fragmented chromosomes,
occurrence of laggard chromosomes, chromosome bridges, desynapsis, micronucleous and tripolar cells.

Keywords

chromosome number; Fabaceae; meiotic behaviour; Onobrychis chorassanica; O. sect. Hymenobrychis