A homeodomain-leucine zipper I transcription factor, MeHDZ14,regulates internode elongation and leaf rolling in cassava(Manihot esculenta Crantz)  

作　　者：Xiaoling Yu Xin Guo Pingjuan Zhao Shuxia Li Liangping Zou Wenbin Li Ziyin Xu Ming Peng Mengbin Ruan 

机构地区：[1]National Key Laboratory for Tropical Crop Breeding,Sanya 572025,Hainan,China [2]Key Laboratory of Biology and Genetic Resources of Tropical Crops,Institute of Tropical Bioscience and Biotechnology,Chinese Academy of Tropical Agricultural Sciences,Haikou 571101,Hainan,China [3]Key Laboratory for Biology and Genetic Resources of Tropical Crops of Hainan Province,Hainan Institute for Tropical Agricultural Resources,Haikou 571101,Hainan,China [4]Sanya Research Institute,Chinese Academy of Tropical Agricultural Sciences,Sanya 572025,Hainan,China [5]College of Tropical Crops,Hainan University,Haikou 570228,Hainan,China

出　　处：《The Crop Journal》2023年第5期1419-1430,共12页作物学报（英文版）

基　　金：supported by the China Agriculture Research System (CARS11-HNCX);the Major Science and Technology Plan of Hainan Province (ZDKJ2021012);the Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences (1630052022008);the National Key Research and Development Program of China (2018YFD1000501);the National Natural Science Foundation of China (31501378);the Hainan Yazhou Bay Seed Lab (B21HJ0303)。

摘　　要：Drought stress impairs plant growth and other physiological functions. MeHDZ14, a homeodomainleucine zipper I transcription factor, is strongly induced by drought stress in various cassava cultivars.However, the role of MeHDZ14 in cassava growth regulation has remained unclear. Here we report that MeHDZ14 affected plant height, such that a dwarf phenotype and altered internode elongation were observed in transgenic cassava lines. MeHDZ14 was found to negatively regulate the biosynthesis of lignin. Its overexpression resulted in abaxially rolled leaves. The morphogenesis of leaf epidermal cells was inhibited by overexpression of MeHDZ14, with decreased auxin and gibberellin and increased cytokinin contents. MeHDZ14 was found to regulate many drought-responsive genes, including genes involved in cell wall synthesis and expansion. MeHDZ14 bound to the promoter of caffeic acid 3-Omethyltransferase 1(MeCOMT1), acting as a transcriptional repressor of genes involved in cell wall development. MeHDZ14 appears to act as a negative regulator of internode elongation and epidermal cell morphogenesis during cassava leaf development.

关 键 词：HD-Zip transcription factor DROUGHT Internode elongation Leaf rolling CASSAVA 

分 类 号：S533[农业科学—作物学]