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Classical cytokinin signal transduction depends on the histidine receptor kinase HK, histidine phosphotransferase HP, and the histidine (H) and aspartic acid (D) in the cytokinin response factor RR.
Researcher Chu Chengcai's group of Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, researcher Zhang Jinsong/Chen Shouyi's research group, and Chinese Academy of Agricultural Sciences researcher Tong Hongning's research group jointly found that PPKL1, which controls grain size, is a new component of cytokinin signaling, D364 of PPKL1 The dot induces the phosphate group on the cytokinin phosphotransfer protein AHP2 to reduce the phosphate relay efficiency from AHP2 to the cytokinin response factor RR21 protein and inhibit rice grain development
Through large-scale mutagenesis, the researchers screened a large-grain mutant s48 and cloned the mutant gene PPKL1.
The PPKL family in rice contains three members, all of which can interfere with the cytokinin phosphate relay signal and have redundant functions
The PPKL family is an important component in the main signaling pathway of brassinolide, and the phosphatase region of its carboxyl terminal is necessary for brassinolide signaling
The related research results are titled A Cryptic Inhibitor of Cytokinin Phosphorelay Controls Rice Grain Size and published online on Molecular Plant
