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A peptide chain release factor 2a gene regulates maize kernel development by modulating mitochondrial function

The Crop Journal 2023年第6期11卷 1731-1741页

作者： Hui Zhang Yijian Feng Kunyang Song Guofang Li Jiao Jin Jingjing Gao Yongtian Qin Hongqiu Wang Jinpeng Cheng Zonghua Liu Jihua Tang Zhiyuan Fu Key Laboratory of Wheat and Maize Crops Science/Collaborative Innovation Center of Henan Grain Crops/College of Agronomy Henan Agricultural UniversityZhengzhou 450046HenanChina The Shennong Laboratory Zhengzhou 450002HenanChina Hebi Academy of Agricultural Sciences Hebi 458030HenanChina Yunnan Tang Jihua Expert Workstation/Zhaotong Academy of Agricultural Sciences Zhaotong 657000YunnanChina

Mitochondrial protein translation that is essential for aerobic energy production includes four essential steps of the mitochondrial ribosome cycle,namely,initiation,elongation,termination of the polypeptide,and ribosome *** termination initiates when a stop codon enters the A site of the mitochondrial ribosome where it is recognized by a dedicated peptide release factor(RF).However,RFs and mechanisms involved in translation in plant mitochondria,especially in monocotyledons,remain largely ***,we identified a crumpled kernel(crk5 allele)mutant,with significantly decreased kernel size,100-kernel weight,and an embryo-lethal *** Crk5 allele was isolated using map-based cloning and found to encode a mitochondrial localization *** it is an ortholog of Arabidopsis mitochondrial RF2a,we named the gene ***2a is missing the 5th–7th exons in the crk5 resulting in deletion of domains containing motifs GGQ and SPF that are essential for release activity of RF,mitochondrial ribosome binding,and stop codon *** blot and qRT-PCR analyses indicate that the crk5 mutation results in abnormal mitochondrion structure and ***,we observed a feedback loop in the crk5 with up-regulated transcript levels detected for several mitochondrial ribosome and mitochondrial-related components,in particular mitochondrial complexes CI,CIV,and a ribosome assembly related ***,our data support a crucial role for ZmmtRF2a in regulation of mitochondrial structure and function in maize.

关键词： Embryo lethality Mitochondrion peptide release factor 2 Zea mays

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