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MYB transcription factor PdMYB118 directly interacts with bHLH transcription factor PdTT8 to regulate wound-induced anthocyanin biosynthesis in poplar

文献类型： 外文期刊

作者： Wang, Haihai 1 ; Wang, Xiaoqing 2 ; Yu, Chunyan 3 ; Wang, Cuiting 1 ; Jin, Yanli 1 ; Zhang, Hongxia 3 ;

作者机构： 1.Chinese Acad Sci, Shanghai Inst Plant Physiol & Ecol, Natl Key Lab Plant Mol Genet, 300 Fenglin Rd, Shanghai 200032, Peoples R China

2.Shanghai Acad Agr Sci, Forestry & Pomol Res Inst, 1000 Jinqi Rd, Shanghai, Peoples R China

3.Ludong Univ, Coll Agr, 186 Hongqizhong Rd, Yantai 264025, Peoples R China

4.Ludong Univ, Key Lab Mol Module Based Breeding High Yield & Ab, 186 Hongqizhong Rd, Yantai 264025, Peoples R China

关键词： Anthocyanin; JAZ1; PdMYB118; PdTT8; Poplar

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2020 年 20 卷 1 期

页码：

收录情况： SCI

摘要： Background R2R3-MYB transcription factors (TFs) play important roles in plant growth and development, and response to biotic and abiotic stresses. However, their regulatory mechanisms in wound-induced anthocyanin biosynthesis in woody plants are largely unknown. Results In this work, we report that expression of anthocyanin biosynthesis genes (ABGs) were activated by PdMYB118, a MYB TF encoding gene from Populus deltoids, and the activation of PdMYB118 was significantly enhanced by PdTT8, a bHLH protein, through its direct interaction with PdMYB118. PdMYB118 and some ABGs were evidently induced by wound induction and methyl jasmonate (MeJA) treatment. Overexpression of PdMYB118 promoted anthocyanin accumulation in transgenic poplar upon wound induction. Furthermore, a poplar JASMONATE ZIM-domain (JAZ) protein, PtrJAZ1, repressed the transcriptional function of PdMYB118/PdTT8 complex by binding to PdTT8, and wound stimulated the biosynthesis of jasmonic acid (JA) and the degradation of PtrJAZ1. Conclusions Based on these observations, we proposed that PtrJAZ1 degradation triggered the expression of ABGs, leading to increased biosynthesis of anthocyanins in the wounded leaves of transgenic poplar. Therefore, our findings not only illustrate the crucial role of PdMYB118 in wound-induced anthocyanin biosynthesis in poplar, but also provide a molecular basis for the genetic engineering of colorful tree species.

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