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A MaizeZmAT6Gene Confers Aluminum ToleranceviaReactive Oxygen Species Scavenging

文献类型： 外文期刊

作者： Du, Hanmei 1 ; Huang, Ying 1 ; Qu, Min 1 ; Li, Yihong 1 ; Hu, Xiaoqi 1 ; Yang, Wei 1 ; Li, Hongjie 1 ; He, Wenzhu 2 ; Ding, Jianzhou 1 ; Liu, Chan 1 ; Gao, Shibin 1 ; Cao, Moju 1 ; Lu, Yanli 1 ; Zhang, Suzhi 1 ;

作者机构： 1.Sichuan Agr Univ, Key Lab Biol & Genet Improvement Maize Southwest, Minist Agr, Maize Res Inst,Agr Dept, Chengdu, Peoples R China

2.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu, Peoples R China

关键词： aluminum toxicity; ZmAT6; maize; reactive oxygen species; antioxidant

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： Aluminum (Al) toxicity is the primary limiting factor that affects crop yields in acid soil. However, the genes that contribute to the Al tolerance process in maize are still poorly understood. Previous studies have predicted that ZmAT6 is a novel protein which could be upregulated under Al stress condition. Here, we found thatZmAT6is expressed in many tissues and organs and can be dramatically induced by Al in both the roots and shoots but particularly in the shoots. The overexpression ofZmAT6in maize andArabidopsisplants increased their root growth and reduced the accumulation of Al, suggesting the contribution ofZmAT6to Al tolerance. Moreover, theZmAT6transgenic maize plants had lower contents of malondialdehyde and reactive oxygen species (ROS), but much higher proline content and even lower Evans blue absorption in the roots compared with the wild type. Furthermore, the activity of several enzymes of the antioxidant system, such as peroxidase (POD), superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX), increased inZmAT6transgenic maize plants, particularly SOD. Consistently, the expression ofZmSODin transgenic maize was predominant upregulated by Al stress. Taken together, these findings revealed thatZmAT6could at least partially confer enhanced tolerance to Al toxicity by scavenging ROS in maize.

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