Population Genetic Aspects of Gametophytic Self-incompatibility(Differentiation Patterns of Plant Populations-Modern Approaches and Recent Progress)(INTERNATIONAL SYMPOSIUM : Differentiation Patterns of Plant Populations and Adaptive Mechanisms)(<Special

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概要

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• In gametophytic self-incompatibility, the S-locus encodes an S-protein whose expression results in successful pollination only when the pollen allele differs from both maternal alleles. Analysis of nucleotide and amino acid sequences of a number of S-alleles has revealed extraordinary allelic sequence divergence and an excess of interspecific shared polymorphism. Population genetic theory and analysis of the distribution of the number of shared polymorphic sites verifies that the sequence diversity is consistent with the alleles being extraordinarily old. Theory also predicts that S-alleles will exhibit less population structuring in a subdivided population than will a neutral locus, and data are being collected to test this. Self-incompatibility must involve two features -a pollen component that specifies the identity of the pollen and a pistil component that recognizes and elicits a response to self-pollen. The S-locus clearly determines the pistil component, but lack of expression of S in pollen leaves open the possibility that there may be another pollen factor. Experiments with transgenic plants have demonstrated that the S-protein expression in the pistil is necessary and sufficient to determine the pistil phenotype. However, several lines of evidence suggest that the degree of elimination of self-pollen in plants with gametophytic self-incompatibility depends on additional genetic factors besides the S-locus. Modifiers may affect self-incompatibility by affecting either the pollen component, the pistil component or both. Population genetic models that test the consequences of modification of these two components are reviewed and extended. Conditions for invasion of reduced degree of self-incompatibility depend in part on the level of inbreeding depression.

• 種生物学会の論文

著者

• Clark A

  Institute Of Molecular Evolutionary Genetics Department Of Biology Pennsylvania State University

• CLARK ANDREW

  Institute of Molecular Evolutionary Genetics, Department of Biology, Pennsylvania State University

関連論文

• Population Genetic Aspects of Gametophytic Self-incompatibility(Differentiation Patterns of Plant Populations-Modern Approaches and Recent Progress)(INTERNATIONAL SYMPOSIUM : Differentiation Patterns of Plant Populations and Adaptive Mechanisms)(

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