The mechanism of sex determination in Rumex acetosella |
| |
Authors: | R. B. Singh Ben W. Smith |
| |
Affiliation: | (1) Division of Plant Sciences, Institute of Advanced Studies, Meerut University, Meerut, India;(2) North Carolina State University, 27607 Raleigh, N. C., USA |
| |
Abstract: | Summary Cytogenetic studies were made with particular emphasis on the sex-determining mechanism in Rumex acetosella (6 x = 42) and its hybrids (F1, F2, BC1 and BC2) with R. hastatulus (synthetic 4 x = 16 = 4 A +4 X = and 4 x = 18 = 4 A + 2 (X Y1Y2) = ). Rumex acetosella was almost strictly dioecious with 50 50 male and female. Breeding tests revealed that the males were heterogametic. The longest chromosomes (S), usually two, are the sex chromosomes of this hexaploid species. The S chromosomes are homomorphic in both male and female. The sex chromosome: autosome ratios, and the strong epistatic male effect of the SM chromosome in the polyploid dioecious species and in the hybrids, are evidence of an X/Y Melandrium type sex-determining mechanism controlled by a single pair of homomorphic sex chromosomes. Thus, the sex chromosome formula of the males was SFSM and that of females was SFSF. The present approach is a new method for resolving the sex-determining mechanism in a dioecious species. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|