Down-regulation of MeMYB2 leads to anthocyanin accumulation and increases chilling tolerance in cassava (Manihot esculenta Crantz)

文献类型： 外文期刊

第一作者： Guo, Xin

作者： Guo, Xin;Guo, Xin;Li, Shuxia;Yu, Xiaoling;Peng, Ming;Ruan, Mengbin;Guo, Xin;Zhao, Pingjuan;Wang, Bin;Zou, Liangping;Li, Shuxia;Yu, Xiaoling;Ruan, Mengbin;Guo, Xin;Zhao, Pingjuan;Wang, Bin;Zou, Liangping;Li, Shuxia;Ruan, Mengbin;Yu, Xiaohui;Lin, Chenyu;Chen, Yinhua;Li, Shuxia;Peng, Ming;Ruan, Mengbin;Zhang, Peng

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关键词： Cassava; Early chilling stress; Anthocyanins; MeMYB2; bHLH transcription factor

期刊名称：CROP JOURNAL （ 影响因子：6.6； 五年影响因子：6.5 ）

ISSN： 2095-5421

年卷期： 2023 年 11 卷 4 期

页码：

收录情况： SCI

摘要： Chilling-induced accumulation of reactive oxygen species (ROS) is harmful to plants, which usually produce anthocyanins to scavenge ROS as protection from chilling stress. As a tropical crop, cassava is hypersensitive to chilling, but the biochemical basis of this hypersensitivity remains unclear. We previously generated MeMYB2-RNAi transgenic cassava with increased chilling tolerance. Here we report that MeMYB2-RNAi transgenic cassava accumulated less ROS but more cyanidin-3-O-glucoside than the wild type under early chilling stress. Under this stress, the anthocyanin biosynthesis pathway was more active in MeMYB2-RNAi lines than in the wild type, and several genes involved in the pathway, including MeTT8, were up-regulated by MeMYB2-RNAi in the transgenic cassava. MeMYB2 bound to the MeTT8 promoter and blocked its expression under both normal and chilling conditions, thereby inhibiting anthocyanin accumulation. MeTT8 was shown to bind to the promoter of Dihydroflavonol 4-reductase (MeDFR-2) and increased MeDFR-2 expression. MeMYB2 appears to act as an inhibitor of chilling-induced anthocyanin accumulation during the rapid response of cassava to chilling stress. (c) 2023 Crop Science Society of China and Institute of Crop Science, CAAS. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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