Self-incompatibility in Papaver: advances in integrating the signalling network

Deborah J Eaves, Carlos Flores-Ortiz, Tamanna Haque, Zongcheng Lin, Nianjun Teng, Vernonica E Franklin-Tong

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)
239 Downloads (Pure)

Abstract

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 is determined by the multi-allelic S-locus, that allows discrimination between self (incompatible) and non-self (compatible) pollen by the pistil. In poppy (Papaver rhoeas), the pistil S-determinant (PrsS) is a small secreted protein which interacts with the pollen S-determinant PrpS, a ~20 kDa novel transmembrane protein. Interaction of matching pollen and pistil S-determinants results in self-recognition, initiating a Ca²⁺-dependent signalling network in incompatible pollen. This triggers several downstream events, including alterations to the cytoskeleton, phosphorylation of sPPases (soluble inorganic pyrophosphatases) and an MAPK (mitogen-activated protein kinase), increases in ROS (reactive oxygen species) and nitric oxide (NO), and activation of several caspase-like activities. This results in the inhibition of pollen tube growth, prevention of self-fertilization and ultimately PCD (programmed cell death) in incompatible pollen. The present review focuses on our current understanding of the integration of these signals with their targets in the SI/PCD network. We also discuss our recent functional expression of PrpS in Arabidopsis thaliana pollen.

Original languageEnglish
Pages (from-to)370-376
Number of pages7
JournalBiochemical Society Transactions
Volume42
Issue number2
DOIs
Publication statusPublished - Apr 2014

Bibliographical note

Deborah Ricci published under Deborah J. Eaves

Keywords

  • cytoskeleton
  • nitric oxide (NO)
  • Papaver
  • pollen
  • programmed cell death (PCD)
  • reactive oxygen species (ROS)
  • self-incompatibility

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