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A LlMYB305-LlC3H18-LlWRKY33 module regulates thermotolerance in lily

文献类型： 外文期刊

作者： Wu, Ze 1 ; Liang, Jiahui 5 ; Li, Ting 1 ; Zhang, Dehua 1 ; Teng, Nianjun 1 ;

作者机构： 1.Nanjing Agr Univ, Natl Forestry & Grassland Adm, Key Lab Biol Ornamental Plants East China, Key Lab Landscaping,Coll Hort,Minist Agr & Rural A, Nanjing 210095, Peoples R China

2.Nanjing Agr Univ, Jiangsu Grad Workstat, Nanjing 210043, Peoples R China

3.Nanjing Oriole Isl Modern Agr Dev Co Ltd, Nanjing 210043, Peoples R China

4.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China

5.Beijing Acad Agr & Forestry Sci, Inst Grassland Flowers & Ecol, Beijing 100097, Peoples R China

关键词： CCCH-zinc finger protein; Lilium longiflorum; LlMYB305; LlWRKY33; Thermotolerance

期刊名称：MOLECULAR HORTICULTURE （ 影响因子：8.1； 五年影响因子：11.0 ）

ISSN： 2730-9401

年卷期： 2023 年 3 卷 1 期

页码：

收录情况： SCI

摘要： The CCCH proteins play important roles in plant growth and development, hormone response, pathogen defense and abiotic stress tolerance. However, the knowledge of their roles in thermotolerance are scarce. Here, we identified a heat-inducible CCCH gene LlC3H18 from lily. LlC3H18 was localized in the cytoplasm and nucleus under normal conditions, while it translocated in the cytoplasmic foci and co-located with the markers of two messenger ribonucleoprotein (mRNP) granules, processing bodies (PBs) and stress granules (SGs) under heat stress conditions, and it also exhibited RNA-binding ability. In addition, LlC3H18 exhibited transactivation activity in both yeast and plant cells. In lily and Arabidopsis, overexpression of LlC3H18 damaged their thermotolerances, and silencing of LlC3H18 in lily also impaired its thermotolerance. Similarly, Arabidopsis atc3h18 mutant also showed decreased thermotolerance. These results indicated that the appropriate expression of C3H18 was crucial for establishing thermotolerance. Further analysis found that LlC3H18 directly bound to the promoter of LlWRKY33 and activated its expression. Besides, it was found that LlMYB305 acted as an upstream factor of LlC3H18 and activated its expression. In conclusion, we demonstrated that there may be a LlMYB305-LlC3H18-LlWRKY33 regulatory module in lily that is involved in the establishment of thermotolerance and finely regulates heat stress response.

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