SYP72 interacts with the mechanosensitive channel MSL8 to protect pollen from hypoosmotic shock during hydration

Xuemei Zhou, Yifan Zheng, Ling Wang, Haiming Li, Yingying Guo, Mengdi Li, Meng-xiang Sun and Peng Zhao ()
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Xuemei Zhou: Wuhan University
Yifan Zheng: Wuhan University
Ling Wang: Wuhan University
Haiming Li: Wuhan University
Yingying Guo: Wuhan University
Mengdi Li: Wuhan University
Meng-xiang Sun: Wuhan University
Peng Zhao: Wuhan University

Nature Communications, 2022, vol. 13, issue 1, 1-14

Abstract: Abstract In flowering plants, hydration of desiccated pollen grains on stigma is a prerequisite for pollen germination, during which pollen increase markedly in volume through water uptake, requiring them to survive hypoosmotic shock to maintain cellular integrity. However, the mechanisms behind the adaptation of pollen to this hypoosmotic challenge are largely unknown. Here, we identify the Qc-SNARE protein SYP72, which is specifically expressed in male gametophytes, as a critical regulator of pollen survival upon hypoosmotic shock during hydration. SYP72 interacts with the MSCS-LIKE 8 (MSL8) and is required for its localization to the plasma membrane. Intraspecies and interspecies genetic complementation experiments reveal that SYP72 paralogs and orthologs from green algae to angiosperms display conserved molecular functions and rescue the defects of Arabidopsis syp72 mutant pollen facing hypoosmotic shock following hydration. Our findings demonstrate a critical role for SYP72 in pollen resistance to hypoosmotic shock through the MSL8 cascade during pollen hydration.

Date: 2022
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DOI: 10.1038/s41467-021-27757-9

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