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Theoretical and Applied Genetics

, Volume 41, Issue 8, pp 360–364 | Cite as

The mechanism of sex determination in Rumex acetosella

  • R. B. Singh
  • Ben W. Smith
Article

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

Present Approach Cytogenetic Study Single Pair Dioecious Species Male Effect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • R. B. Singh
    • 1
  • Ben W. Smith
    • 1
    • 2
  1. 1.Division of Plant Sciences, Institute of Advanced StudiesMeerut UniversityMeerutIndia
  2. 2.North Carolina State UniversityRaleighUSA

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