'A life or death decision' for pollen tubes in S-RNase-based self-incompatibility.

Abstract:

:Mate choice is an essential process during sexual plant reproduction, in which self-incompatibility (SI) is widely adopted as an intraspecific reproductive barrier to inhibit self-fertilization by many flowering plants. Genetic studies show that a single polymorphic S-locus, encoding at least two components from both the pollen and pistil sides, controls the discrimination of self and non-self pollen. In the Solanaceae, Plantaginaceae, and Rosaceae, an S-RNase-based SI mechanism is involved in such a discrimination process. Recent studies have provided some important clues to how a decision is made to accept cross pollen or specifically to reject self pollen. In this review, the molecular features of the pistil and pollen S-specificity factors are briefly summarized and then our current knowledge of the molecular control of cross-pollen compatibility (CPC) and self-pollen incompatibility (SPI) responses, respectively, is presented. The possible biochemical mechanisms of the specificity determinant between the pistil and pollen S factors are discussed and a hypothetical S-RNase endosome sorting model is proposed to illustrate the distinct destinies of pollen tubes following compatible and incompatible pollination.

journal_name

J Exp Bot

authors

Chen G,Zhang B,Zhao Z,Sui Z,Zhang H,Xue Y

doi

10.1093/jxb/erp381

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

2027-37

issue

7

eissn

0022-0957

issn

1460-2431

pii

erp381

journal_volume

61

pub_type

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