首页|ZmCYP90D1 regulates maize internode development by modulating brassinosteroid-mediated cell division and growth
ZmCYP90D1 regulates maize internode development by modulating brassinosteroid-mediated cell division and growth
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Plant height(PH)is associated with lodging resistance and planting density,which is regulated by a com-plicated gene network.In 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 cloning.ZmCYP90D1 was constitutively expressed and showed highest expression in basal internodes,and its pro-tein was targeted to the nucleus.A G-to-A substitution was identified to be the causal mutation,which resulted in a truncated protein in m30.Loss of function of ZmCYP90D1 changed expression of hormone-responsive genes,in particular brassinosteroid(BR)-responsive genes which is mainly involved in cell cycle regulation and cell wall extension and modification in plants.The concentration of typhasterol(TY),a downstream intermediate of ZmCYP90D1 in the BR pathway,was reduced.A haplotype conferring dwarfing without reducing yield was identified.ZmCYP90D1 was inferred to influence plant height and stalk diameter via hormone-mediated cell division and cell growth via the BR pathway.
Key Laboratory of Wheat and Maize Crops Science/Collaborative Innovation Center of Henan Grain Crops/College of Agronomy,Henan Agricultural University,Zhengzhou 450046,Henan,China
Hebi Academy of Agricultural Sciences,Hebi 458030,Henan,China
The Shennong Laboratory,Zhengzhou 450002,Henan,China
Yunnan Tang Jihua Expert Workstation/Zhaotong Academy of Agricultural Sciences,Zhaotong 657000,Yunnan,China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Technologies R & D Program of Henan ProvinceYunnan Academician Expert Workstation
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