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An endophytic fungus interacts with the defensinlike protein OsCAL1 to regulate cadmium allocation in rice

文献类型： 外文期刊

作者： Gu, Tianyu 1 ; Qi, Ziai 1 ; Wang, Yating 1 ; Chen, Siying 1 ; Yan, Jing 1 ; Qiu, Huapeng 1 ; Yu, Yanxuan 1 ; Fang, Zijun 1 ; Wang, Junmin 6 ; Gong, Jiming 1 ;

作者机构： 1.Chinese Acad Sci, Shanghai Ctr Plant Stress Biol, CAS Ctr Excellence Mol Plant Sci, Natl Key Lab Plant Mol Genet, Shanghai 200032, Peoples R China

2.ShanghaiTech Univ, Sch Life Sci & Technol, Shanghai 201210, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Hunan Univ Sci & Technol, Coll Life Sci, Hunan Key Lab Econ Crops Genet Improvement & Integ, Xiangtan 411201, Peoples R China

5.Henan Univ, Sch Life Sci, State Key Lab Crop Stress Adaptat & Improvement, Kaifeng 475004, Peoples R China

6.Zhejiang Acad Agr Sci, Inst Crops & Nucl Technol Utilizat, Hangzhou 310021, Peoples R China

关键词： defensin-like protein; Fusarium oxysporum; endophyte; cadmium allocation

期刊名称：MOLECULAR PLANT （ 影响因子：27.5； 五年影响因子：22.6 ）

ISSN： 1674-2052

年卷期： 2024 年 17 卷 2 期

页码：

收录情况： SCI

摘要： Defensin-like proteins are conserved in multicellular organisms and contribute to innate immune responses against fungal pathogens. In rice, defensins play a novel role in regulating cadmium (Cd) efflux from the cytosol. However, whether the antifungal activity of defensins correlates with Cd-efflux function remains unknown. In this study, we isolated an endophytic Fusarium, designed Fo10, by a comparative microbiome analysis of rice plants grown in a paddy contaminated with Cd. Fo10 is tolerant to high levels of Cd, but is sensitive to the defensin-like protein OsCAL1, which mediates Cd efflux to the apoplast. We found that Fo10 symbiosis in rice is regulated by OsCAL1 dynamics, and Fo10 coordinates multiple plant processes, including Cd uptake, vacuolar sequestration, efflux to the environment, and formation of Fe plaques in the rhizosphere. These processes are dependent on the salicylic acid signaling pathway to keep Cd levels low in the cytosol of rice cells and to decrease Cd levels in rice grains without any yield penalty. Fo10 also plays a role in Cd tolerance in the poaceous crop maize and wheat, but has no observed effects in the eudicot plants Arabidopsis and tomato. Taken together, these findings provide insights into the mechanistic basis underlying how a fungal endophyte and host plant interact to control Cd accumulation in host plants by adapting defense responses to promote the establishment of a symbiosis that permits adaptation to high-Cd environments.

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