Maize cryptochromes 1a1 and 1a2 promote seedling photomorphogenesis and shade resistance in Zea mays and Arabidopsis  

作　　者：Xiaocong Fan Shizhan Chen Wenjing Wu Meifang Song Guanghua Sun Shuaitao Yao Weimin Zhan Lei Yan Hongdan Li Yanpei Zhang Lijian Wang Kang Zhang Liangliang Jiang Jianping Yang Qinghua Yang 

机构地区：[1]College of Agronomy,State Key Laboratory of Wheat and Maize Crop Science,and Center for Crop Genome Engineering,Longzi Lake Campus,Henan Agricultural University,Zhengzhou 450046,Henan,China [2]Institute of Radiation Technology,Beijing Academy of Science and Technology,Beijing 100875,China [3]Institute of Crops,Jiangxi Academy of Agricultural Sciences,Nanchang 330200,Jiangxi,China [4]Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing 100081,China [5]Genovo Biotechnology Co.,Ltd.,Tianjin 301700,China [6]Henan Institute of Science and Technology,Xinxiang 453003,Henan,China

出　　处：《The Crop Journal》2023年第4期1192-1203,共12页作物学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (31871709);the Construction of Support System for National Agricultural Green Development Advance Region of Qushui County,Tibet,China (QYXTZX-LS2022-01);the Key Project of Beijing Natural Science Foundation (6151002);the Startup Grants of Henan Agricultural University (30501038,30500823)。

摘　　要：Maize growth and development are regulated by light quality,intensity and photoperiod.Cryptochromes are blue/ultraviolet-A light receptors involved in stem elongation,shade avoidance,and photoperiodic flowering.To investigate the function of cryptochrome 1(CRY1) in maize,where it is encoded by Zm CRY1,we obtained two Zm CRY1a genes(Zm CRY1a1 and Zm CRY1a2),both of which share the highest similarity with other gramineous plants,in particular rice CRY1a by phylogenetic analysis.In Arabidopsis,overexpression of Zm CRY1a genes promoted seedling de-etiolation under blue and white light,resulting in dwarfing of mature plants.In seedlings of the maize inbred line Zong 31(Zm CRY1aOE),overexpression of Zm CRY1a genes caused a reduction in the mesocotyl and first leaf sheath lengths due to down-regulation of genes influencing cell elongation.In mature transgenic maize plants,plant height,ear height,and internode length decreased in response to overexpression of Zm CRY1a genes.Expression of Zm CRY1a were insensitive to low blue light(LBL)-induced shade avoidance syndrome(SAS) in Arabidopsis and maize.This prompted us to investigate the regulatory role of the gibberellin and auxin metabolic pathways in the response of Zm CRY1a genes to LBL treatment.We confirmed a link between Zm CRY1a expression and hormonal influence on the growth and development of maize under LBL-induced SAS.These results reveal that Zm CRY1a has a relatively conservative function in regulating maize photomorphogenesis and may guide new strategies for breeding high density-tolerant maize cultivars.

关 键 词：Zea mays L.Cryptochrome PHOTOMORPHOGENESIS Shade avoidance syndrome Hormone 

分 类 号：S513[农业科学—作物学]