Affiliation:
1. National Key Laboratory of Wheat Improvement, College of Life Sciences Shandong Agricultural University Taian Shandong 271018 China
2. Donald Danforth Plant Science Center St Louis MO 63132 USA
Abstract
Summary
MicroRNAs (miRNAs) play crucial roles in regulating plant development and stress responses. However, the functions and mechanism of intronic miRNAs in plants are poorly understood.
This study reports a stress‐responsive RNA splicing mechanism for intronic miR400 production, whereby miR400 modulates reactive oxygen species (ROS) accumulation and improves plant tolerance by downregulating its target expression.
To monitor the intron splicing events, we used an intronic miR400 splicing‐dependent luciferase transgenic line. Luciferase activity was observed to decrease after high cadmium concentration treatment due to the retention of the miR400‐containing intron, which inhibited the production of mature miR400. Furthermore, we demonstrated that under Cd treatments, Pentatricopeptide Repeat Protein 1 (PPR1), the target of miR400, acts as a positive regulator by inducing ROS accumulation. Ppr1 mutation affected the Complex III activity in the electron transport chain and RNA editing of the mitochondrial gene ccmB.
This study illustrates intron splicing as a key step in intronic miR400 production and highlights the function of intronic miRNAs as a ‘signal transducer’ in enhancing plant stress tolerance.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Cited by
1 articles.
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