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ZmCYP90D1 regulates maize internode development by modulating brassinosteroid-mediated cell division and growth

The Crop Journal 2024年第1期12卷 58-67页

作者： Canran Sun Yang Liu Guofang Li Yanle Chen Mengyuan Li Ruihua Yang Yongtian Qin Yongqiang Chen Jinpeng Cheng 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

Plant height(PH)is associated with lodging resistance and planting density,which is regulated by a complicated gene *** this study,we identified a spontaneous dwarfing mutation in maize,m30,with decreased internode number and length but increased internode diameter.A candidate gene,ZmCYP90D1,which encodes a member of the cytochrome P450 family,was isolated by map-based ***90D1 was constitutively expressed and showed highest expression in basal internodes,and its protein was targeted to the nucleus.A G-to-A substitution was identified to be the causal mutation,which resulted in a truncated protein in *** of function of ZmCYP90D1 changed expression of hormoneresponsive genes,in particular brassinosteroid(BR)-responsive genes which is mainly involved in cell cycle regulation and cell wall extension and modification in *** concentration of typhasterol(TY),a downstream intermediate of ZmCYP90D1 in the BR pathway,was reduced.A haplotype conferring dwarfing without reducing yield was ***90D1 was inferred to influence plant height and stalk diameter via hormone-mediated cell division and cell growth via the BR pathway.

关键词： Maize ZmCYP90D1 BR biosynthesis Dwarf plant

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

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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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