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Actin Depolymerization Factor ADF1 Regulated by MYB30 Plays an Important Role in Plant Thermal Adaptation

文献类型： 外文期刊

作者： Wang, Lu 1 ; Cheng, Jianing 1 ; Bi, Shuangtian 1 ; Wang, Jinshu 1 ; Cheng, Xin 1 ; Liu, Shihang 1 ; Gao, Yue 1 ; Lan, Qingkuo 2 ; Shi, Xiaowei 2 ; Wang, Yong 2 ; Zhao, Xin 2 ; Qi, Xin 2 ; Xu, Shiyong 2 ; Wang, Che 1 ;

作者机构： 1.Shenyang Agr Univ, Coll Biosci & Biotechnol, Shenyang 110866, Peoples R China

2.Tianjin Acad Agr Sci, Inst Germplasm Resource & Biotechnol, Tianjin 300384, Peoples R China

3.Tianjin Acad Agr Sci, State Key Lab Vegetable Biobreeding, Tianjin 300392, Peoples R China

关键词： ADF1; MYB30; actin filaments; thermal adaptation; Arabidopsis; Chinese cabbage

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.6； 五年影响因子：6.2 ）

ISSN：

年卷期： 2023 年 24 卷 6 期

页码：

收录情况： SCI

摘要： Actin filaments are essential for plant adaptation to high temperatures. However, the molecular mechanisms of actin filaments in plant thermal adaptation remain unclear. Here, we found that the expression of Arabidopsis actin depolymerization factor 1 (AtADF1) was repressed by high temperatures. Compared with wild-type seedlings (WT), the mutation of AtADF1 and the overexpression of AtADF1 led to promoted and inhibited plant growth under high temperature conditions, respectively. Further, high temperatures induced the stability of actin filaments in plants. Compared with WT, Atadf1-1 mutant seedlings showed more stability of actin filaments under normal and high temperature conditions, while the AtADF1 overexpression seedlings showed the opposite results. Additionally, AtMYB30 directly bound to the promoter of AtADF1 at a known AtMYB30 binding site, AACAAAC, and promoted the transcription of AtADF1 under high temperature treatments. Genetic analysis further indicated that AtMYB30 regulated AtADF1 under high temperature treatments. Chinese cabbage ADF1 (BrADF1) was highly homologous with AtADF1. The expression of BrADF1 was inhibited by high temperatures. BrADF1 overexpression inhibited plant growth and reduced the percentage of actin cable and the average length of actin filaments in Arabidopsis, which were similar to those of AtADF1 overexpression seedlings. AtADF1 and BrADF1 also affected the expression of some key heat response genes. In conclusion, our results indicate that ADF1 plays an important role in plant thermal adaptation by blocking the high-temperature-induced stability of actin filaments and is directly regulated by MYB30.

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