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PtoMYB142, a poplar R2R3-MYB transcription factor, contributes to drought tolerance by regulating wax biosynthesis

文献类型： 外文期刊

作者： Song, Qin 1 ; Kong, Lingfei 1 ; Yang, Xuerui 1 ; Jiao, Bo 1 ; Hu, Jian 1 ; Zhang, Zhichao 1 ; Xu, Changzheng 1 ; Luo, Keming 1 ;

作者机构： 1.Southwest Univ, Sch Life Sci, Chongqing Key Lab Plant Resource Conservat & Germ, Chongqing 400715, Peoples R China

2.Southwest Univ, Sch Life Sci, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Minist Educ, Chongqing 400715, Peoples R China

3.Hebei Acad Agr & Forestry Sci, Inst Biotechnol & Food Sci, Shijiazhuang 050051, Hebei, Peoples R China

关键词： cuticular wax; drought stress; Poplar; PtoMYB142; transcriptional regulation

期刊名称：TREE PHYSIOLOGY （ 影响因子：4.561； 五年影响因子：5.121 ）

ISSN： 0829-318X

年卷期：

页码：

收录情况： SCI

摘要： Drought is one of the main environmental factors that limit plant development and growth. Accordingly, plants have evolved strategies to prevent water loss under drought stress, such as stomatal closure, maintenance of root water uptake, enhancement of stem water transport, and synthesis and deposition of cuticular wax. However, the molecular evidence of cuticular wax biosynthesis regulation in response to drought is limited in woody plants. Here, we identified an MYB transcription factor, Populus tomentosa Carr. MYB transcription factor (PtoMYB142), in response to drought stress from P. tomentosa. Over-expression of PtoMYB142 (PtoMYB142-OE) resulted in increased wax accumulation in poplar leaves, and significantly enhanced drought resistance. We found that the expression of wax biosynthesis genes CER4 and 3-ketoacyl CoA synthase (KCS) were markedly induced under drought stress, and significantly up-regulated in PtoMYB142-OE lines. Biochemical analysis confirmed that PtoMYB142 could directly bind to the promoter of CER4 and KCS6, and regulate their expression in P. tomentosa. Taken together, this study reveals that PtoMYB142 regulates cuticular wax biosynthesis to adapt to water-deficient conditions.

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