期刊
CURRENT BIOLOGY
卷 22, 期 2, 页码 154-159出版社
CELL PRESS
DOI: 10.1016/j.cub.2011.12.006
关键词
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资金
- Biotechnology and Biological Sciences Research Council (BBSRC)
- CONACYT-Mexico
- China Scholarship Council
- Huazhong Agricultural University
- Biotechnology and Biological Sciences Research Council [BB/C501325/1] Funding Source: researchfish
Many angiosperms use specific interactions between pollen and pistil proteins as self recognition and/or rejection mechanisms to prevent self-fertilization. Self-incompatibility (SI) is encoded by a multiallelic S locus, comprising pollen and pistil S-determinants [1, 2]. In Papaver rhoeas, cognate pistil and pollen S-determinants, PrpS, a pollen-expressed transmembrane protein, and PrsS, a pistil-expressed secreted protein [3, 4], interact to trigger a Ca2+-dependent signaling network [5-10], resulting in inhibition of pollen tube growth, cytoskeletal alterations [11-13], and programmed cell death (PCD) [14, 15] in incompatible pollen. We introduced the PrpS gene into Arabidopsis thaliana, a self-compatible model plant. Exposing transgenic A. thaliana pollen to recombinant Papaver PrsS protein triggered remarkably similar responses to those observed in incompatible Papaver pollen: S-specific inhibition and hallmark features of Papaver SI [11-15]. Our findings demonstrate that Papaver PrpS is functional in a species with no SI system that diverged similar to 140 million years ago [16]. This suggests that the Papaver SI system uses cellular targets that are, perhaps, common to all eudicots and that endogenous signaling components can be recruited to elicit a response that most likely never operated in this species. This will be of interest to biologists interested in the evolution of signaling networks in higher plants.
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