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Theoretical and Applied Genetics

, Volume 94, Issue 3–4, pp 493–497 | Cite as

Sex determination and sex ratio in the dioecious shrub Salix viminalis L.

  • C. Alström-Rapaport
  • M. Lascoux
  • U. Gullberg

Abstract

 Various ecological factors (e.g. herbivory, difference between males and females in colonising ability) have been invoked to explain female-biased sex ratios in populations of willow species. It was implicitly assumed that genetic factors would lead to a balanced sex ratio in the absence of ecological disturbances. In an experiment carried out in a homogeneous environment and in the absence of herbivores the progeny sex ratio of 13 crosses of basket willow (Salix viminalis L.) was observed to range from extreme female bias to extreme male bias. The observed sex ratio cannot be explained by the presence of sex chromosomes without assuming that additional loci are also involved in the sex determination. Alternatively, the sex ratios in this study can be explained by a sex determination mechanism governed by multiple independent loci.

Key words Sex determination sex ratio Dioecy Salix viminalis 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • C. Alström-Rapaport
    • 1
  • M. Lascoux
    • 1
  • U. Gullberg
    • 1
  1. 1.Department of Plant Breeding, Swedish University of Agricultural Sciences. Box 7003, S-750 07 Uppsala, SwedenSE

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