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Overexpression of the Arabidopsis photorespiratory pathway gene, serine: glyoxylate aminotransferase (AtAGT1), leads to salt stress tolerance in transgenic duckweed (Lemna minor)

文献类型： 外文期刊

作者： Yang, Lin 1 ; Han, Huajun 1 ; Liu, Miaomiao 1 ; Zuo, Zhaojiang 2 ; Zhou, Kaiqiang 1 ; Lu, Jianchao 1 ; Zhu, Yerong 1 ; Ba 1 ;

作者机构： 1.Nankai Univ, Dept Plant Biol & Ecol, Coll Life Sci, Tianjin 300071, Peoples R China

2.Tianjin Acad Agr Sci, Res Ctr Grape, Tianjin 300192, Peoples R China

关键词： Salt stress;Photorespiration;SGAT;l-serine;Oxidative stress;Duckweed

期刊名称：PLANT CELL TISSUE AND ORGAN CULTURE （ 影响因子：2.711； 五年影响因子：2.73 ）

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收录情况： SCI

摘要： Salt stress has attracted increasing attention due to its toxic ability to restrict plant growth, and the photorespiration pathway has been shown to develop improved plant tolerance to abiotic stress. In this study, an Arabidopsis photorespiratory pathway gene serine: glyoxylate aminotransferase (SGAT), named as AtAGT1, was successfully overexpressed in duckweed (Lemna minor) to investigate the salinity defense capability in three transgenic overexpressed (OE) lines. Increased SGAT activity and decreased endogenous serine levels in these transgenic plant lines under salt stress resulted in enhanced protection against root abscission, higher maximum quantum yield of photosystem II (Fv/Fm), increased defense from cell damage as a result of improved cell membrane integrity, a decrease of reactive oxygen species (ROS) accumulation, and a strengthened antioxidant system. The salt tolerance in these transgenic OE lines indicates that the improvement of photorespiration stimulated the antioxidant system to scavenge ROS. The change of serine level also suggests the role of serine during salt stress. This transgenic engineering in duckweed not only introduced salt tolerance to this aquatic plant but also reveals a significant role of photorespiration during salinity stress.

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