The Diversity of Self-Incompatibility Systems in Flowering Plants

S. J. Hiscock; S. M. McInnis

doi:10.1055/s-2003-37981

Plant Biology, Table of Contents

Plant Biol (Stuttg) 2003; 5(1): 23-32
DOI: 10.1055/s-2003-37981

Review Article

Georg Thieme Verlag Stuttgart ·New York

The Diversity of Self-Incompatibility Systems in Flowering Plants

S. J. Hiscock, S. M. McInnis

School of Biological Sciences, University of Bristol, Bristol, UK

Abstract

Flowering plants are the most successful group of land plants and dominate the earth's vegetation with around 300 000 species. This success is, in part, the consequence of a set of unique reproductive innovations that evolved with the flower. Most notable of these innovations were the closed carpel and double fertilization. Closed carpels permitted the evolution of effective mechanisms for pollen selection and discrimination, while double fertilization leading to endosperm formation allowed for more efficient utilization of resources because reserves are only allocated to the seed after fertilization. This review will focus on the most important and best understood mechanism of pollen discrimination, self-incompatibility (SI), a genetically determined pollen recognition system that prevents self-fertilization and fertilization by other individuals with the same incompatibility phenotype. In recent years much progress has been made towards elucidating the molecular mechanisms of SI operating in three distinct SI systems found in the Brassicaceae, Solanaceae and Papaveraceae, respectively. More recent molecular data obtained from the Poaceae, Convolvulaceae and Asteraceae, however, suggest that other molecular mechanisms of SI exist. A survey of classical genetic studies of SI predicts yet further potential molecular mechanisms of SI. We discuss the evolutionary implications of this apparent diversity in molecular pathways leading to SI and stress the need for more molecular studies of different SI systems.

Key words

Self-incompatibility - S genes - S-RNase - S receptor kinase - S-protein

Full Text

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S. J. Hiscock

School of Biological Sciences
University of Bristol

Woodland Road
Bristol BS8 1UG
UK

Email: simon.hiscock@bristol.ac.uk

Section Editor: L. A. C. J. Voesenek