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ZmMYB31, a R2R3-MYB transcription factor in maize, positively regulates the expression of CBF genes and enhances resistance to chilling and oxidative stress

文献类型： 外文期刊

作者： Li, Meng 1 ; Lin, Lin 4 ; Zhang, Yuanhu 3 ; Sui, Na 2 ;

作者机构： 1.Shandong Acad Agr Sci, Jinan, Shandong, Peoples R China

2.Shandong Normal Univ, Coll Life Sci, Shandong Prov Key Lab Plant Stress, Jinan 250014, Shandong, Peoples R China

3.Shandong Agr Univ, Coll Life Sci, State Key Lab Crop Biol, Tai An, Shandong, Peoples R China

4.Water Res Inst Shandong Prov, Jinan, Shandong, Peoples R China

关键词： ZmMYB31; Maize; Chilling stress; Oxidative stress

期刊名称：MOLECULAR BIOLOGY REPORTS （ 影响因子：2.316； 五年影响因子：2.357 ）

ISSN： 0301-4851

年卷期： 2019 年 46 卷 4 期

页码：

收录情况： SCI

摘要： Maize (Zea mays L.) is an important model plant with an important role in agriculture and national economies all over the world. The optimum growth temperature of maize is between 25 and 28 degrees C. At temperatures below 12 degrees C, maize is vulnerable to damage by chilling stress. MYB transcription factors play important roles in plants' response to low temperature stress. Maize ZmMYB31 encodes a R2R3-MYB transcription factor, ZmMYB31, which localized in the nucleus. ZmMYB31 expression was induced by chilling stress and the highest expression level was detected with the 24h chilling treatment. ZmMYB31 expression also increased in overexpressing Arabidopsis lines. The minimal fluorescence (Fo) with all photosystem II reaction centers open increased in wild type (WT) and transgenic plants under chilling stress, with the highest increase in WT. The maximal photochemical efficiency of photosystem II (Fv/Fm) decreased more in WT than in transgenic plants during chilling stress. Furthermore, the ZmMYB31-overexpressing lines showed higher superoxide dismutase and ascorbate peroxidase activity and lower reactive oxygen species (ROS) content than the WT. The expression of genes related to chilling stress was higher in transgenic plants than in WT. These results suggest that ZmMYB31 plays a positive regulatory role in chilling and peroxide stress by regulating the expression of chilling stress-related genes to reduce ion extravasation, ROS content, and low-temperature photoinhibition, thereby improving low temperature resistance.

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