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A life or death decision for pollen tubes in S-RNase-based self-incompatibility Chen G; Zhang B; Zhao Z; Sui Z; Zhang H; Xue YJ Exp Bot 2010[Apr]; 61 (7): 2027-37Mate 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.|*Inbreeding[MESH]|Alleles[MESH]|Crosses, Genetic[MESH]|Genetic Loci/*genetics[MESH]|Pollen Tube/*enzymology[MESH]|Ribonucleases/*metabolism[MESH] |
