Review: Exocyst, exosomes, and autophagy in pollen-stigma interactions ($)

Some plants are able to suppress inbreeding through a system called self-incompatibility, in which “self”-pollen is unable to reach “self” eggs. Self-incompatibility has evolved multiple times and takes several forms. Goring reviews the cellular processes of self-incompatibility that occur in Brassicaseae in pollen-stigma interactions, the “first checkpoint in pollen selection”. Pollen coat proteins are involved in the recognition of compatible or incompatible pollen. Compatible pollen stimulates secretion from stigmatic papillae, which also involves changes in the actin cytoskeleton and calcium ion fluxes, making this system a useful model for studies of polarized secrection. J. Exp. Bot. 10.1093/jxb/erx340