Ecological genetics of sex ratios in plant populations.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Spencer C H BarrettMelinda Pickup

Abstract

In many angiosperm species, populations are reproductively subdivided into distinct sexual morphs including females, males and hermaphrodites. Sexual polymorphism is maintained by frequency-dependent selection, leading to predictable sex ratios at equilibrium. Charles Darwin devoted much of his book 'The Different Forms of Flowers on Plants of the Same Species' (1877) to investigating plant sexual polymorphisms and laid the foundation for many problems addressed today by integrating theory with empirical studies of the demography and genetics of populations. Here, we summarize our recent work on the ecological and genetic mechanisms influencing variation in sex ratios and their implications for evolutionary transitions among sexual systems. We present the results of a survey of sex ratios from 126 species from 47 angiosperm families and then address two general problems using examples from diverse angiosperm taxa: (i) the mechanisms governing biased sex ratios in dioecious species; (ii) the origins and maintenance of populations composed of females, males and hermaphrodites. Several themes are emphasized, including the importance of non-equilibrium conditions, the role of life history and demography in affecting sex ratios, the...Continue Reading

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Citations

Jul 5, 2013·Proceedings. Biological Sciences·Spencer C H Barrett
Jul 21, 2010·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Michael Bonsall, Brian Charlesworth
Jul 22, 2015·Proceedings of the National Academy of Sciences of the United States of America·Spencer C H Barrett
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Jun 15, 2021·Ecology Letters·Yunyun WangZhiheng Wang
Jun 18, 2021·Tree Physiology·Haifeng SongSheng Zhang

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