The blue light receptor CRY1 interacts with GID1 and DELLA proteins to repress gibberellin signaling and plant growth  

作　　者：Baiqiang Yan Zongju Yang Guanhua He Yexing Jing Huixue Dong Lan Ju Yunwei Zhang Yingfang Zhu Yun Zhou Jiaqiang Sun 

机构地区：[1]National Key Facility for Crop Gene Resources and Genetic Improvement,Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing 100081,China [2]State Key Laboratory of Crop Stress Adaptation and Improvement,Key Laboratory of Plant Stress Biology,School of Life Sciences,Henan University,Kaifeng 475004,China

出　　处：《Plant Communications》2021年第6期82-95,共14页植物通讯（英文）

基　　金：This research was supported by the Central Public-interest Scientific Institution Basic Research Fund(S2021ZD02);the Open Project Funding of the State Key Laboratory of Crop Stress Adaptation and Improvement,the National Natural Science Foundation of China(grant nos.31971880 and 31991213);the Agricultural Science and Technology Innovation Program of CAAS.

摘　　要：Improvements in plant architecture,such as reduced plant height under high-density planting,are important for agricultural production.Light and gibberellin(GA)are essential external and internal cues that affect plant architecture.In this study,we characterize the direct interaction of distinct receptors that link light and GA signaling in Arabidopsis(Arabidopsis thaliana)and wheat(Triticum aestivum L.).We show that the light receptor CRY1 represses GA signaling through interaction with all five DELLA proteins and promotion of RGA protein accumulation in Arabidopsis.Genetic analysis shows that CRY1-mediated growth repression is achieved by means of the DELLA proteins.Interestingly,we find that CRY1 also directly interacts with the GA receptor GID1 to competitively inhibit the GID1-GAI interaction.We also show that overexpression of TaCRY1a reduces plant height and coleoptile growth in wheat and that TaCRY1a interacts with both TaGID1 and Rht1 to competitively attenuate the TaGID1-Rht1 interaction.Based on these findings,we propose that the photoreceptor CRY1 competitively inhibits the GID1-DELLA interaction,thereby stabilizing DELLA proteins and enhancing their repression of plant growth.

关 键 词：wheat plant height GIBBERELLIN cryptochrome 1 GID1 DELLA 

分 类 号：Q94[生物学—植物学]