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gamma-Aminobutyric acid confers cadmium tolerance in maize plants by concerted regulation of polyamine metabolism and antioxidant defense systems

文献类型： 外文期刊

作者： Seifikalhor, Maryam 1 ; Aliniaeifard, Sasan 2 ; Bernard, Francoise 3 ; Seif, Mehdi 2 ; Latifi, Mojgan 3 ; Hassani, 1 ;

作者机构： 1.Univ Tehran, Coll Sci, Dept Plant Biol, Tehran, Iran

2.Univ Tehran, Coll Aburaihan, Dept Hort, Photosynth Lab, Tehran, Iran

3.Shahid Beheshti Univ, GC, Dept Plant Sci, Fac Life Sci & Biotechnol, Tehran, Iran

4.KWS Gateway Res Ctr LLC, BRDG Pk Danforth Plant Sci Ctr, St Louis, MO USA

5.Shahid Beheshti Univ, Med Plants & Drugs Res Inst, Dept Phytochem, GC, Tehran, Iran

6.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2020 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Gamma-Aminobutyric acid (GABA) accumulates in plants following exposure to heavy metals. To investigate the role of GABA in cadmium (Cd) tolerance and elucidate the underlying mechanisms, GABA (0, 25 and 50 mu M) was applied to Cd-treated maize plants. Vegetative growth parameters were improved in both Cd-treated and control plants due to GABA application. Cd uptake and translocation were considerably inhibited by GABA. Antioxidant enzyme activity was enhanced in plants subjected to Cd. Concurrently GABA caused further increases in catalase and superoxide dismutase activities, which led to a significant reduction in hydrogen peroxide, superoxide anion and malondealdehyde contents under stress conditions. Polyamine biosynthesis-responsive genes, namely ornithine decarboxylase and spermidine synthase, were induced by GABA in plants grown under Cd shock. GABA suppressed polyamine oxidase, a gene related to polyamine catabolism, when plants were exposed to Cd. Consequently, different forms of polyamines were elevated in Cd-exposed plants following GABA application. The maximum quantum efficiency of photosystem II (F-v/F-m) was decreased by Cd-exposed plants, but was completely restored by GABA to the same value in the control. These results suggest a multifaceted contribution of GABA, through regulation of Cd uptake, production of reactive oxygen species and polyamine metabolism, in response to Cd stress.

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