R2R3 MYB transcription factor SbMYBHv33 negatively regulates sorghum biomass accumulation and salt tolerance

文献类型： 外文期刊

第一作者： Zheng, Hongxiang

作者： Zheng, Hongxiang;Gao, Yinping;Dang, Yingying;Wu, Fenghui;Wang, Xuemei;Zhang, Fangning;Du, Xihua;Sui, Na;Sui, Yi

作者机构：

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.4； 五年影响因子：5.7 ）

ISSN： 0040-5752

年卷期： 2023 年 136 卷 1 期

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收录情况： SCI

摘要： Salt stress is one of the main types of environmental stress leading to a reduction in crop yield worldwide. Plants have also evolved a variety of corresponding regulatory pathways to resist environmental stress damage. This study aimed to identify a SbMYBHv33 transcription factor that downregulates in salt, drought, and abscisic acid (ABA) in the salt-tolerant inbred line sorghum M-81E. The findings revealed that overexpression of SbMYBHv33 in sorghum significantly reduced sorghum biomass accumulation at the seedling stage and also salinity tolerance. Meanwhile, a heterologous transformation of Arabidopsis with SbMYBHv33 produced a similar phenotype. The loss of function of the Arabidopsis homolog of SbMYBHv33 resulted in longer roots and increased salt tolerance. Under normal conditions, SbMYBHV33 overexpression promoted the expression of ABA pathway genes in sorghum and inhibited growth. Under salt stress conditions, the gene expression of SbMYBHV33 decreased in the overexpressed lines, and the promotion of these genes in the ABA pathway was attenuated. This might be an important reason for the difference in growth and stress resistance between SbMYBHv33-overexpressed sorghum and ectopic expression Arabidopsis. Hence, SbMYBHv33 is an important component of sorghum growth and development and the regulation of salt stress response, and it could negatively regulate salt tolerance and biomass accumulation in sorghum.

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