Cytogenetic studies were made with particular emphasis on the sex-determining mechanism in Rumex acetosella (6 x = 42) and its hybrids (F 1, F 2, BC 1 and BC 2) with R. hastatulus (synthetic 4 x = 16 = 4 A +4 X = ♀ and 4 x = 18 = 4 A + 2 (X Y 1 Y 2) = ♂). 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 S M 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 S F S M and that of females was S F S F. The present approach is a new method for resolving the sex-determining mechanism in a dioecious species.
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Communicated by M. S. Swaminathan
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Singh, R.B., Smith, B.W. The mechanism of sex determination in Rumex acetosella . Theoret. Appl. Genetics 41, 360–364 (1971). https://doi.org/10.1007/BF00277336
- Present Approach
- Cytogenetic Study
- Single Pair
- Dioecious Species
- Male Effect