It was found that SRL10 of rice leaf roll gene co-regulated heat tolerance

SRL10 interacted with CATB to improve the heat tolerance of rice. Photo courtesy of rice

Recently, the team of Zhang Guangheng/Academician Qian, a researcher at the State Key Laboratory of Rice Biology of the China Rice Research Institute, published a research paper online in the Plant biotechnology journal. In this study, SRL10 was cloned by the double-stranded RNA-binding protein-coding gene that simultaneously regulated the formation of rice plant morphology and yield and heat tolerance, and revealed the molecular mechanism of its interaction with catalase CATB to synergistically regulate the heat tolerance of rice, and identified the allele variation of SRL10 with excellent heat tolerance in rice.

Rice plant type is closely related to yield and stress tolerance, and the two “green revolutions” and super rice breeding of rice are accompanied by the continuous improvement of plant type and the gradual improvement of resistance. In recent years, with the intensification of the greenhouse effect, the frequency of extreme weather events has posed a serious threat to global food production. The mining and mechanism analysis of genes for the establishment of rice plant morphology, yield and heat tolerance co-regulation, is conducive to further improving the genetic network of co-regulation of rice plant type and stress resistance, and provides new theoretical basis and genetic resources for the collaborative improvement of multiple traits and stress resistance breeding of rice.

The research team used rice leaf curl and heat-sensitive mutant SRL10, chromosome fragment replacement line and natural germplasm genetic population to complete the map cloning of the target gene SRL10, which encodes a double-stranded RNA-binding protein, through forward genetics methods. It was found that SRL10 affected miRNA biosynthesis, positively regulated the development of nearaxial vesicular cells, affected plant morphology and yield, and participated in miRNA-mediated heat tolerance regulation process.

It was found that SRL10 participated in ROS metabolism under high temperature stress, which reduced the damage of high temperature stress to plants and improved heat tolerance. Genotypes carrying SRL10 Hap3 alleles may be excellent alleles to improve heat tolerance in rice.

Wang Jiajia, a doctoral student at the China Rice Research Institute, and Xu Jing, a postdoctoral fellow and associate researcher at the Yalin Institute of the Chinese Academy of Forestry, are co-first authors of the paper, and Qian Qian and Zhang Guangheng are co-corresponding authors.

The research was supported by the National Natural Science Foundation of China, the Talent Special Project of the Chinese Academy of Agricultural Sciences, and the Key Project of the National Nanfan Research Institute of the Chinese Academy of Agricultural Sciences in Sanya. (Source: Li Chen, China Science News)

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