Zakirullah Khan , Rahmatullah Jan , Saleem Asif , Muhammad Farooq , Kyung-Min Kim
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引用次数: 0
Abstract
In this study, we examined the impacts of exogenously applied γ-aminobutyric acid (GABA) on rice plants under nickel (Ni)-induced stress. Nickel stress significantly reduced growth parameters, disrupted mineral balance, and increased plant stress through elevated H₂O₂, malondialdehyde (MDA), and superoxide anions (O₂⁻), coupled with compromised antioxidant defense mechanisms. However, GABA application effectively alleviated these detrimental effects by enhancing growth parameters, improving relative water content, and reducing oxidative stress. GABA significantly increased antioxidative enzymes activities such as catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX), and glutathione (GSH). Furthermore, GABA reduced nickel accumulation by upregulating metal transporter proteins (MTPs) OsMTP1 and OsMTP8, promoting nickel sequestration into vacuoles and restoring essential mineral contents, such as Ca²⁺ and Mg²⁺. Gene expression analysis revealed that GABA stimulated the GABA shunt pathway, significantly enhancing the expression of OsGAD, OsGABA-T, and OsSSADH. These findings demonstrate the potential of using GABA to mitigate nickel toxicity by modulating growth, antioxidant defenses, metal homeostasis, and stress-responsive pathways in rice plants.
期刊介绍:
The journal Plant Stress deals with plant (or other photoautotrophs, such as algae, cyanobacteria and lichens) responses to abiotic and biotic stress factors that can result in limited growth and productivity. Such responses can be analyzed and described at a physiological, biochemical and molecular level. Experimental approaches/technologies aiming to improve growth and productivity with a potential for downstream validation under stress conditions will also be considered. Both fundamental and applied research manuscripts are welcome, provided that clear mechanistic hypotheses are made and descriptive approaches are avoided. In addition, high-quality review articles will also be considered, provided they follow a critical approach and stimulate thought for future research avenues.
Plant Stress welcomes high-quality manuscripts related (but not limited) to interactions between plants and:
Lack of water (drought) and excess (flooding),
Salinity stress,
Elevated temperature and/or low temperature (chilling and freezing),
Hypoxia and/or anoxia,
Mineral nutrient excess and/or deficiency,
Heavy metals and/or metalloids,
Plant priming (chemical, biological, physiological, nanomaterial, biostimulant) approaches for improved stress protection,
Viral, phytoplasma, bacterial and fungal plant-pathogen interactions.
The journal welcomes basic and applied research articles, as well as review articles and short communications. All submitted manuscripts will be subject to a thorough peer-reviewing process.