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The endo-beta mannase man7 contributes to cadmium tolerance by modulating root cell wall binding capacity in Arabidopsis thaliana

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Journal of Integrative Plant Biology 2023年第7期65卷 1670-1686页

作者： Qi Wu Yu Ting Meng Zhi Hang Feng Ren Fang Shen Xiao Fang Zhu State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310058China

The heavy metal cadmium(Cd) is detrimental to crop growth and threatens human health through the food chain. To cope with Cd toxicity,plants employ multiple strategies to decrease Cd uptake and its root-to-shoot translocation. However, genes that participate in the Cd-induced transcriptional regulatory network, including those encoding transcription factors, remain largely unidentified. In this study, we demonstrate that ENDO-BETA-manNASE 7(man7) is necessary for the response of Arabidopsis thaliana to toxic Cd levels. We show that man7 is responsible for mannase activity and modulates mannose content in the cell wall, which plays a role in Cd compartmentalization in the cell wall under Cd toxicity conditions. Additionally,the repression of root growth by Cd was partially reversed via exogenous application of mannose,suggesting that man7-mediated cell wall Cd redistribution depends on the mannose ***, we identified a basic leucine zipper(bZIP) transcription factor, bZIP44, that acts upstream of man7 in response to Cd *** dual-luciferase assays indicated that bZIP44 directly binds to the man7 promoter region and activates its transcription. Loss of bZIP44 function was associated with greater sensitivity to Cd treatment and higher accumulation of the heavy metal in roots and ***, man7 overexpression relieved the inhibition of root elongation seen in the bzip44mutant under Cd toxicity conditions. This study thus reveals a pathway showing that man7-associated Cd tolerance in Arabidopsis is controlled by bZIP44 upon Cd exposure.

关键词： Arabidopsis thaliana bZIP44 cadmium cell wall man7 mannose

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