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

作者：Wanzhi Li, Xiufen Li, Kexuan Zhou, Xin Jin, Chengyi Huang, Rongping Hu, Lijin Lin, Jin Wang · 发表于：Environmental Progress & Sustainable Energy · 年份：2024 · DOI：10.1002/ep.14364 · 被引用次数：8 · 研究领域：GABA and Rice Research、Medicinal Plants and Neuroprotection、Plant Genetic and Mutation Studies

Abstract γ‐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‐c...