Floral Polymorphisms and Their Functional Significance in the Heterostylous Syndrome

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


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.


Pollen Tube Pollen Size Style Length Legitimate Pollination Floral Morph 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • Rivka Dulberger
    • 1
  1. 1.Department of Botany, G.S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael

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