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

文献类型： 外文期刊

作者： Yu, Xiaoling 1 ; Guo, Xin 2 ; Zhao, Pingjuan 2 ; Li, Shuxia 1 ; Zou, Liangping 2 ; Li, Wenbin 2 ; Xu, Ziyin 5 ; Peng, Ming 1 ; Ruan, Mengbin 1 ;

作者机构： 1.Natl Key Lab Trop Crop Breeding, Sanya 572025, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Key Lab Biol & Genet Resources Trop Crops, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China

3.Hainan Inst Trop Agr Resources, Key Lab Biol & Genet Resources Trop Crops Hainan P, Haikou 571101, Hainan, Peoples R China

4.Chinese Acad Trop Agr Sci, Sanya Res Inst, Sanya 572025, Hainan, Peoples R China

5.Hainan Univ, Coll Trop Crops, Haikou 570228, Hainan, Peoples R China

关键词： HD -Zip transcription factor; Drought; Internode elongation; Leaf rolling; Cassava

期刊名称：CROP JOURNAL （ 影响因子：6.6； 五年影响因子：6.5 ）

ISSN： 2095-5421

年卷期： 2023 年 11 卷 5 期

页码：

收录情况： SCI

摘要： Drought stress impairs plant growth and other physiological functions. MeHDZ14, a homeodomain-leucine 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-O-methyltransferase 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. (c) 2023 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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