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Exogenous γ-aminobutyric acid (GABA) improves the cadmium phytoremediation capacity of Solanum nigrum var. humile under cadmium stress

文献类型： 外文期刊

作者： Li, Wanzhi 1 ; Li, Xiufen 2 ; Zhou, Kexuan 1 ; Jin, Xin 1 ; Huang, Chengyi 3 ; Hu, Rongping 4 ; Lin, Lijin 1 ; Wang, Jin 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Hort, Chengdu, Sichuan, Peoples R China

2.New Mexico State Univ, Dept Plant & Environm Sci, Las Cruces, NM USA

3.Sichuan Agr Univ, Coll Environm Sci, Chengdu, Sichuan, Peoples R China

4.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu, Sichuan, Peoples R China

关键词： cadmium; hyperaccumulator; phytoremediation; Solanum nigrum var. humile; gamma-aminobutyric acid (GABA)

期刊名称：ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY （ 影响因子：2.8； 五年影响因子：2.6 ）

ISSN： 1944-7442

年卷期： 2024 年

页码：

收录情况： SCI

摘要： gamma-aminobutyric acid (GABA) has shown promise in enhancing crop tolerance to heavy metal stress. To improve the cadmium (Cd) phytoremediation capacity of hyperaccumulator Solanum nigrum var. humile, the effects of exogenous GABA on the growth and Cd accumulation of S. nigrum var. humile were studied. When exposed to Cd stress (0.1 mg/L) through irrigation, S. nigrum var. humile exhibited inhibited growth, characterized by decreased biomass and contents of photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, and carotenoid). However, the application of exogenous GABA at 1 and 2 g/L increased various organs biomass and photosynthetic pigment content of S. nigrum var. humile to certain degree under Cd stress. Compared with the Cd treatment, the concentrations of 1 and 2 g/L GABA increased the shoot biomass by 8.24% and 16.62%, respectively. GABA also increased the Cd contents, bioconcentration factors, and Cd extractions in various organs of S. nigrum var. humile. Compared with the Cd treatment, the concentrations of 1 and 2 g/L GABA increased the shoot Cd extraction by 17.66% and 24.47%, respectively. Moreover, correlation and gray relational analyses showed that the shoot biomass, chlorophyll b content, and total chlorophyll content were the top three parameters closely related to shoot Cd extraction. These findings suggest that GABA can alleviate Cd-induced stress in S. nigrum var. humile, thus enhancing its phytoremediation capacity for Cd-contaminated soils.

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