rlb mutant phenotype image courtesy of Rice Research Institute, Chinese Academy of Agricultural Sciences
rlb mutant phenotype image courtesy of Rice Institute, Chinese Academy of Agricultural Sciences rlb mutant phenotype image courtesy of Rice Institute, Chinese Academy of Agricultural Sciences
RLB-EMF2b-OsCKX4 module regulates the molecular mechanism of rice lateral branches.
RLB-EMF2b-OsCKX4 module regulates the molecular mechanism of rice lateral branches.
Recently, Zhang Jian’s team, a researcher at the State Key Laboratory of Rice Biology, China National Rice Research Institute, discovered that the nuclear-localized KNOX homeobox protein RLB (OsH15) can recruit the polycomb complex PRC2 to the promoter region of the cytokinin oxidase gene OsCKX4 , Implement histone modification inhibition, regulate the steady state of rice cytokinin, and then regulate the growth and development of lateral organs such as tillers, spikelets and glume protection
Plant Physiology According to Zhang Jian, the corresponding author of the thesis, similar to the limbs of humans and animals, higher plants can also differentiate into branches at the main stem parts such as roots, branches, and florets
The production of branches can strengthen the competition of plants for resources such as nutrients, sunlight and space, and increase the number of progeny reproduction, which has positive evolutionary significance
The team used the lateral branch development mutant rlb in the rice Zhonghua 11 background as materials to carry out phenotypic identification, gene cloning, regulatory mechanism and improved application research
The study found that the expression level of the cytokinin oxidase gene OsCKX4 was significantly up-regulated in the mutant rlb
RLB interacts with the PRC2 member EMF2b of the polycomb complex, and co-localizes with the PRC2-mediated histone suppression modification H3K27me3 in the OsCKX4 promoter
This study provides a new perspective for the study of the relationship between rice cytokinin homeostasis and plant lateral branches, and also provides genetic resources for rice genetic improvement
The research was supported by the National Natural Science Foundation of China and the special support for basic scientific research operations of central public welfare scientific research institutes
Related paper information: https://doi.
https://doi.
org/10.
1093/plphys/kiab494
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