Self-incompatibility in Papaver: advances in integrating the signalling network
Deborah J Eaves1, Carlos Flores-Ortiz1, Tamanna Haque1
1*School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.
Biochemical Society Transactions
|March 21, 2014
Summary
Self-incompatibility (SI) prevents self-fertilization in plants like poppy. The pistil PrsS protein interacts with pollen PrpS, triggering a signaling network that causes programmed cell death (PCD) in incompatible pollen.
Area of Science:
- Plant reproductive biology
- Molecular genetics
- Cell signaling
Background:
- Self-fertilization reduces offspring fitness in hermaphrodite angiosperms.
- Self-incompatibility (SI) is a genetic mechanism preventing self-fertilization, regulated by the S-locus.
- In poppy (Papaver rhoeas), SI involves pistil (PrsS) and pollen (PrpS) S-determinants.
Purpose of the Study:
- To review the integration of signals within the SI/programmed cell death (PCD) network in poppy.
- To discuss the functional expression of the pollen S-determinant (PrpS) in Arabidopsis thaliana.
Main Methods:
- Review of existing literature on SI and PCD pathways.
- Functional expression of PrpS in a heterologous system (Arabidopsis thaliana).
Main Results:
- Interaction of matching PrsS and PrpS initiates a calcium-dependent signaling cascade in incompatible pollen.
- Downstream events include cytoskeletal changes, protein phosphorylation, increased reactive oxygen species (ROS) and nitric oxide (NO), and caspase-like activities.
- These events lead to pollen tube growth inhibition, preventing self-fertilization via PCD.
Conclusions:
- The SI/PCD network in poppy involves complex signal integration.
- Understanding this network is crucial for plant breeding and reproductive biology.
- Successful expression of PrpS in Arabidopsis provides a model for further functional studies.
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