A schematic diagram of peptide inhibition of stigma receptor kinase signaling pathway regulating hydration
The research group of Li Chao from the School of Life Sciences, East China Normal University took the model plant Arabidopsis as the research object, and revealed that the small PCP-B peptide in the mulch of the pollen competes with the RALF33 small peptide in the stigma, thereby inhibiting the RALF33-FER/ in the stigma.
The stigma of flowering plants can specifically recognize the pollen of this species and reject pollen of other species, ensuring the hydration and germination of the compatible pollen of this species, while preventing the germination of distant pollen and fungal spores.
In this study, Li Chao’s research team found that the papillary cells of the pistil stigma of Arabidopsis thaliana accumulated active oxygen before pollination, and pollination caused a decrease in the level of active oxygen.
It was further discovered that the small RALF33 peptide secreted by the stigma papillary cells caused the production of reactive oxygen species through the FER/ANJ-LLG1-ROP2-RBOHD signaling pathway.
Li Chao, the corresponding author of the paper, told the Chinese Journal of Science that the study showed that stigma papillary cells produce reactive oxygen species through the RALF33-FER/ANJ-LLG1-ROP2-RBOHD signaling pathway before pollination, and PCP-Bγ peptides from pollen after pollination Competitively with the stigma autocrine RALF33 small peptide to combine with FER/ANJ, block the active oxygen generation pathway in the papillary cells, reduce the level of active oxygen in the papillary cells, and promote the hydration of pollen.
"From the perspective of plant developmental biology, this discovery is an example of receptor kinase sensing and switching different types of small peptide ligands to precisely regulate plant development.
Related paper information: org/10.
org/10.
1126/science.
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org/10.
1126/science.
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