Iron limitation-induced endophytic Ammoniphilus assemblage promotes root apoplastic iron remobilization by attenuation of salicylic acid pathways

文献类型： 外文期刊

第一作者： Zhu, Lin

作者： Zhu, Lin;Zhang, Aijing;Liu, Huabing;Xie, Yue;Lu, Xiaomin;Wang, Jianfei;Zhu, Lin;Guo, Jiansheng;Yan, Congsheng;Zhou, Cheng

作者机构：

期刊名称：NPJ BIOFILMS AND MICROBIOMES （ 影响因子：9.2； 五年影响因子：9.9 ）

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年卷期： 2025 年 11 卷 1 期

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收录情况： SCI

摘要： Plants establish symbiotic associations with root-colonizing microbes to adapt to adverse conditions. However, how root-associated microbiota interacted with their hosts to improve plant growth under nutrient deficient conditions remains poorly understood. In this study, we explored an interaction between tomato plants and root-associated microbiota under iron (Fe) limitation, mediated by bacterial secretion of glutamine. 16S rRNA gene sequencing revealed that Fe-limited conditions altered the composition of root-associated microbiomes, resulting in the enrichment of Ammoniphilus sp. This taxon was isolated and shown to alleviate Fe deficiency symptoms. Moreover, Fe deficiency triggered salicylic acid (SA)-induced hydrogen peroxide (H2O2) burst, thereby inhibiting the exudation of Fe-mobilizing phenolics from the roots. However, bacterial secretion of Gln greatly attenuated the SA-induced H2O2 production in the roots, thereby enhancing bacterial colonization and promoting apoplastic Fe remobilization. Collectively, these results underscored a microbial strategy for orchestrating plant SA pathways to facilitate the reutilization of root apoplastic Fe.

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