FFGA1 Protein Is Essential for Regulating Vegetative Growth, Cell Wall Integrity, and Protection against Stress in Flammunina filiformis

文献类型： 外文期刊

第一作者： Du, Muyun

作者： Du, Muyun;Xie, Yongbo;Wang, Meng;Yang, Huan;Hu, Banghui;Liu, Yuanyuan;Tao, Yongxin;Liu, Fang;Xie, Baogui;Du, Muyun;Mukhtar, Irum

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关键词： Flammunina filiformis; signal transduction; G alpha i; RNA interference; overexpression; stress resistance

期刊名称：JOURNAL OF FUNGI （ 影响因子：5.724； 五年影响因子：6.413 ）

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年卷期： 2022 年 8 卷 4 期

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收录情况： SCI

摘要： Flammulina filiformis is a popular mushroom which has been regarded as a potential model fungus for mycelium growth, fruiting body development, and stress response studies. Based on a genome-wide search, four genes encoding heterotrimeric G protein alpha subunits were identified in F. filiformis. The data of conserved domain analysis showed that these genes contain only one subgroup I of G alpha subunit (G alpha d), similar to many other fungi. To explore the function of G alpha i, FfGa1 over-expression (OE) and RNA interference (RNAi) strains were generated using the Agrobacterium tumefaciens-mediated transformation (ATMT) approach. RNAi transformant strains showed remarkably reduced growth on PDA medium and added sensitivity to cell wall-enforcing agents with maximum growth inhibition, but showed better growth in response to hypertonic stress-causing agents, while OE strains exhibited more resistance to thermal stress and mycoparasite Trichoderma as compared to the wild-type and RNAi strains. Taken together, our results indicated that FfGa1 positively regulates hyphal extension, and is crucial for the maintenance of cell wall integrity and protection against biotic and abiotic (hypertonic and thermal) stress.

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