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

IF 6 1区农林科学 Q1 AGRONOMY Crop Journal Pub Date : 2023-10-01 DOI:10.1016/j.cj.2023.03.001

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

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引用次数: 1

Abstract

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.

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同源结构域亮氨酸拉链I转录因子MeHDZ14调控木薯节间伸长和叶片卷曲

干旱胁迫损害植物生长和其他生理功能。MeHDZ14是一种同源结构域亮氨酸拉链I转录因子，在干旱胁迫下受到强烈的诱导。然而，MeHDZ14在木薯生长调控中的作用尚不清楚。在这里，我们报道了MeHDZ14影响植株高度，因此在转基因木薯品系中观察到矮化表型和节间伸长的改变。发现MeHDZ14负向调节木质素的生物合成。其过表达导致叶片向背面卷曲。过度表达MeHDZ14抑制了叶片表皮细胞的形态发生，生长素和赤霉素含量降低，细胞分裂素含量升高。MeHDZ14被发现调控许多干旱响应基因，包括参与细胞壁合成和扩增的基因。MeHDZ14与咖啡酸3- o -甲基转移酶1 (MeCOMT1)启动子结合，作为参与细胞壁发育的基因的转录抑制因子。在木薯叶片发育过程中，MeHDZ14对节间伸长和表皮细胞形态发生起负调控作用。

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来源期刊

Crop Journal Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

9.90

自引率

3.00%

发文量

638

审稿时长

41 days

期刊介绍： The major aims of The Crop Journal are to report recent progresses in crop sciences including crop genetics, breeding, agronomy, crop physiology, germplasm resources, grain chemistry, grain storage and processing, crop management practices, crop biotechnology, and biomathematics. The regular columns of the journal are Original Research Articles, Reviews, and Research Notes. The strict peer-review procedure will guarantee the academic level and raise the reputation of the journal. The readership of the journal is for crop science researchers, students of agricultural colleges and universities, and persons with similar academic levels.