... as for pollen tube reception and sperm release. Moreover, a large number of genetic controls exist to prevent fertilization of egg and central cell by alien sperm cells. Two articles in this issue cover the molecular mechanisms of SI (self-incompatibility), a widespread phenomenon among angiosperms that permits...

...June B. Nasrallah; Mikhail E. Nasrallah SRK ( S -locus receptor kinase) is the receptor that allows stigma epidermal cells to discriminate between genetically related (‘self’) and genetically unrelated (‘non-self’) pollen in the self-incompatibility response of the Brassicaceae. SRK and its ligand...

...Deborah J. Eaves; Carlos Flores-Ortiz; Tamanna Haque; Zongcheng Lin; Nianjun Teng; Vernonica E. Franklin-Tong Self-fertilization, which results in reduced fitness of offspring, is a common problem in hermaphrodite angiosperms. To prevent this, many plants utilize SI (self-incompatibility), which...

...Thomas L. Sims; Avani Patel; Pratima Shrestha The recent identification of several proteins playing key roles in S -RNase-based gametophytic self-incompatibility has led both to a greater understanding of the molecular biology of this response, as well as to questions regarding the precise...

... mechanism called self-incompatibility (SI). When the male and female S -determinants match, self (incompatible) pollen is recognized and rejected before fertilization can occur. In poppy ( Papaver rhoeas ), the pistil S- determinant (PrsS) is a small secreted protein that interacts with incompatible pollen...

... molecular mechanisms including self-incompatibility in the Brassicaceae, Solanaceae and Papaveraceae are now well understood. However, the largest part of the pollen tube pathway inside the transmitting tract towards the ovule harbouring the female gametophyte still requires intensive investigations...