黄化
生物
隐色素
下胚轴
拟南芥
赤霉素
苗木
光形态发生
突变体
拟南芥
光敏色素
细胞生物学
植物
基因
遗传学
生物化学
生物钟
酶
红灯
作者
Shizhan Chen,Xiaocong Fan,Meifang Song,Shuaitao Yao,T.G. Liu,Wusi Ding,Lei Liu,Menglan Zhang,Weimin Zhan,Lei Yan,Guanghua Sun,Hongdan Li,Lijian Wang,K. Zhang,Xiaolin Jia,Qinghua Yang,Jianping Yang
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2023-11-02
卷期号:194 (2): 902-917
标识
DOI:10.1093/plphys/kiad546
摘要
Maize (Zea mays L.) is one of the most important crops worldwide. Photoperiod, light quality, and light intensity in the environment can affect the growth, development, yield, and quality of maize. In Arabidopsis (Arabidopsis thaliana), cryptochromes are blue-light receptors that mediate the photocontrol of stem elongation, leaf expansion, shade tolerance, and photoperiodic flowering. However, the function of maize cryptochrome ZmCRY in maize architecture and photomorphogenic development remains largely elusive. The ZmCRY1b transgene product can activate the light signaling pathway in Arabidopsis and complement the etiolation phenotype of the cry1-304 mutant. Our findings show that the loss-of-function mutant of ZmCRY1b in maize exhibits more etiolation phenotypes under low blue light and appears slender in the field compared with wild-type plants. Under blue and white light, overexpression of ZmCRY1b in maize substantially inhibits seedling etiolation and shade response by enhancing protein accumulation of the bZIP transcription factors ELONGATED HYPOCOTYL 5 (ZmHY5) and ELONGATED HYPOCOTYL 5-LIKE (ZmHY5L), which directly upregulate the expression of genes encoding gibberellin (GA) 2-oxidase to deactivate GA and repress plant height. More interestingly, ZmCRY1b enhances lodging resistance by reducing plant and ear heights and promoting root growth in both inbred lines and hybrids. In conclusion, ZmCRY1b contributes blue-light signaling upon seedling de-etiolation and integrates light signals with the GA metabolic pathway in maize, resulting in lodging resistance and providing information for improving maize varieties.
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