GmNFYA3, a target gene of miR169, is a positive regulator of plant tolerance to drought stress

文献类型： 外文期刊

第一作者： Ni, Zhiyong

作者： Ni, Zhiyong;Hu, Zheng;Jiang, Qiyan;Zhang, Hui

作者机构：

关键词： ABA and salt sensitivity;Drought tolerance;GmNFYA3;miR169;Soybean

期刊名称：PLANT MOLECULAR BIOLOGY （ 影响因子：4.076； 五年影响因子：4.89 ）

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收录情况： SCI

摘要： Nuclear factor Y (NF-Y) is a heterotrimeric transcription factor composed of NF-YA, NF-YB and NF-YC proteins. In this study, we identified and characterized a gene, GmNFYA3, which encodes the NF-YA subunit of the NF-Y complex in soybeans (Glycine max L.). Real time RT-PCR analysis indicated that GmNFYA3 was induced by abscisic acid (ABA) and abiotic stresses, such as polyethylene glycol, NaCl and cold. Subcellular localization analysis suggested that GmNFYA3 may activate its specific targets in the nucleus. Histochemical β-glucuronidase (GUS) staining revealed that the expression of the GUS gene driven by the GmNFYA3 promoter occurred in various transgenic Arabidopsis tissues. Coexpression in Nicotiana benthamiana and 5′ RACE assays indicated that miR169 directs GmNFYA3 mRNA cleavage in vivo. Overexpression of GmNFYA3 resulted in Arabidopsis with reduced leaf water loss and enhanced drought tolerance. In addition, the transgenic Arabidopsis exhibited increased sensitivity to high salinity and exogenous ABA. Moreover, the transcript levels of ABA biosynthesis (ABA1, ABA2), ABA signaling (ABI1, ABI2) and stress-responsive genes, including RD29A and CBF3, were generally higher in GmNFYA3 plants than in wild-type controls under normal conditions. These results suggest that the GmNFYA3 gene functions in positive modulation of drought stress tolerance and has potential applications in molecular breeding to enhance drought tolerance in crops.

分类号： Q946

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