THE EVOLUTION OF DIOECY, HETERODICHOGAMY, AND LABILE SEX EXPRESSION IN ACER

@inproceedings{Renner2007THEEO,
  title={THE EVOLUTION OF DIOECY, HETERODICHOGAMY, AND LABILE SEX EXPRESSION IN ACER},
  author={Susanne S. Renner and Ludwig Beenken and Guido W. Grimm and Alexander Kocyan and Robert E. Ricklefs},
  booktitle={Evolution; international journal of organic evolution},
  year={2007}
}
Abstract The northern hemisphere tree genus Acer comprises 124 species, most of them monoecious, but 13 dioecious. [...] Key Method This hypothesis was based on phylogenetic analyses (Gleiser and Verdú, New Phytol. 165: 633–640. 2005) that included 29–39 species of Acer coded for five sexual strategies (duodichogamous monoecy, heterodichogamous androdioecy, heterodichogamous trioecy, dichogamous subdioecy, and dioecy) treated as ordered states or as a single continuous variable. When reviewing the basis for…Expand
Phylogenetic analysis of sexual systems in Inuleae (Asteraceae).
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It is found that peripheral female flowers and petaloid rays were phylogenetically correlated and empirical evidence shows that a causal relationship between these traits is not clear, and the number of transitions and the rate of change from monoecy to gynomonoecy were much higher than the opposite.
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The pattern of flowering observed in this species maximizes the level of outcrossing, since the temporal separation of male and female flowers on the same plant is precise enough for the species to be regarded as (obligatorily) xenogamous.
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The current focus is on the genetic mechanisms underlying unisexual flowers and individuals in plants' sedentary life style, which may often favor polygamous systems in which sexually inconstant individuals can persist.
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The analyses suggest that - at least for these genera with the currently available data - dioecy neither consistently places a strong brake on diversification nor is a strong driver.
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