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SiMYB56Confers Drought Stress Tolerance in Transgenic Rice by Regulating Lignin Biosynthesis and ABA Signaling Pathway

文献类型： 外文期刊

作者： Xu, Weiya 1 ; Tang, Wensi 1 ; Wang, Chunxiao 1 ; Ge, Linhao 1 ; Sun, Jianchang 2 ; Qi, Xin 1 ; He, Zhang 1 ; Zhou, Yongbi 1 ;

作者机构： 1.Chinese Acad Agr Sci, Natl Key Facil Crop Genet Resources & Genet Impro, Key Lab Crop Genet & Breeding, Minist Agr,Inst Crop Sci, Beijing, Peoples R China

2.Ningxia Acad Agr & Forestry Sci, Inst Crop Sci, Yongning, Peoples R China

关键词： foxtail millet; drought tolerance; lignin biosynthesis; ABA signaling pathway

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2020 年 11 卷

页码：

收录情况： SCI

摘要： Foxtail millet (Setaria italica) originated in China and is generally cultivated in arid and barren soil. Through long-term harsh environmental selection, foxtail millet has acquired significant drought resistance. However, the molecular mechanism of foxtail millet drought resistance is still unknown. Here, we identified a drought-induced R2R3-MYB transcription factorSiMYB56in foxtail millet. Overexpression ofSiMYB56significantly enhances tolerance to drought stress in transgenic rice plants at both the vegetative and the reproductive stage and has no adverse effect on its normal growth. Compared with wild-type controls,SiMYB56-overexpressing rice plants had lower MDA content and higher lignin content under drought conditions. Quantitative real-time PCR and Transcriptional activity assays demonstrated thatSiMYB56could activate expression of lignin biosynthesis genes under drought conditions. Also, we found that overexpression ofSiMYB56can led to ABA accumulation in the seeds transgenic rice plants. Further experiments showed that Overexpression ofSiMYB56can upregulate the expression of ABA synthesis and response related genes under drought conditions. In conclusion,SiMYB56may enhance the drought resistance of transgenic rice plants by regulating lignin biosynthesis and ABA signaling pathway, makingSiMYB56a candidate gene for drought resistance improvement in gramineous crops.

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