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Floral Polymorphisms and Their Functional Significance in the Heterostylous Syndrome

  • Chapter
Evolution and Function of Heterostyly

Part of the book series: Monographs on Theoretical and Applied Genetics ((GENETICS,volume 15))

Abstract

The emblem of the heterostylous syndrome is the positioning at equivalent levels of the stigmas of one floral morph and the anthers of one or two alternate morphs. Of less prominence in the syndrome are distinguishing characters of the pistils and stamens of the morphs, particularly of the stigmas and pollen grains. At the core of heterostyly there is typically a sporophytically controlled, diallelic incompatibility system which prevents or reduces self- and intra-morph fertilizations. Thus, in distyly the entire syndrome is controlled by a “supergene”, i.e., a tightly linked group of genes, each with two alleles and apparently controlling three groups of characters; in tristyly the control is by genes at two loci, each with two alleles and epistatic interaction.

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  1. Department of Botany, G.S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 69978, Israel

    Rivka Dulberger

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  1. Rivka Dulberger
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  1. Department of Botany, University of Toronto, Toronto, Ontario, M5S 3B2, Canada

    Spencer C. H. Barrett

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Dulberger, R. (1992). Floral Polymorphisms and Their Functional Significance in the Heterostylous Syndrome. In: Barrett, S.C.H. (eds) Evolution and Function of Heterostyly. Monographs on Theoretical and Applied Genetics, vol 15. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-86656-2_3

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  • DOI: https://doi.org/10.1007/978-3-642-86656-2_3

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