Gibberellic acid reverses glucose-inhibited photosynthesis and growth via reduced glutathione and hormonal crosstalk in chromium-treated mustard

IF 6.8 Q1 PLANT SCIENCES

Plant Stress Pub Date : 2024-12-01 DOI:10.1016/j.stress.2024.100694

Bareerah Morris , Sheen Khan , Noushina Iqbal , Abdulrahman Al-Hashimi , Nafees A. Khan

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引用次数: 0

Abstract

Chromium (Cr) contamination jeopardizes agricultural productivity by impairing photosynthesis and growth in plants. This study investigates the potential of gibberellic acid (GA) in mitigating the adverse effects of Cr exposure in mustard (Brassica juncea L.) plants and elucidates the underlying mechanism involved. Mustard plants were treated with 100 µM Cr to induce stress, followed by individual and combined foliar applications of 10 µM GA and 6 % glucose (Glu) to assess their effects on photosynthesis, growth, oxidative stress and hormonal regulation. Photosynthesis and growth of Cr-treated plants were inhibited, partially due to Glu accumulation. GA application enhanced Glu utilization, reduced reactive oxygen species (ROS) production, and optimized ethylene and nitric oxide (NO) levels. The optimized ethylene and NO signaled increased proline, GSH and antioxidant enzyme activity, thus promoting photosynthesis and growth under Cr stress. This study highlights the role of GA with Glu in counteracting Cr toxicity through complex hormonal interactions, emphasizing its potential as a phytoremediation strategy to improve the growth and productivity of crops in Cr-contaminated soils. The mechanisms underlying GA-mediated stress alleviation could pave the way for developing targeted approaches to enhance plant resilience against heavy metal stress.

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赤霉素酸通过减少谷胱甘肽和激素串扰逆转葡萄糖抑制的光合作用和生长

铬（Cr）污染通过损害植物的光合作用和生长来危害农业生产力。本研究探讨了赤霉素（GA）在芥菜（Brassica juncea L.）植物中减轻Cr暴露不良影响的潜力，并阐明了其潜在机制。以100µM Cr处理芥菜植株诱导胁迫，然后单独和联合施用10µM GA和6%葡萄糖（Glu），以评估它们对光合作用、生长、氧化应激和激素调节的影响。cr处理植株的光合作用和生长受到抑制，部分原因是由于Glu积累。GA提高了Glu利用率，降低了活性氧（ROS）的产生，并优化了乙烯和一氧化氮（NO）的水平。优化后的乙烯和NO可提高植株的脯氨酸、谷胱甘肽和抗氧化酶活性，促进植株在Cr胁迫下的光合作用和生长。本研究强调了GA与Glu通过复杂的激素相互作用来抵消Cr毒性的作用，强调了其作为一种植物修复策略的潜力，可以改善Cr污染土壤中作物的生长和生产力。ga介导的胁迫缓解机制可能为开发有针对性的方法来增强植物对重金属胁迫的恢复能力铺平道路。

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来源期刊

Plant Stress PLANT SCIENCES-

CiteScore

5.20

自引率

8.00%

发文量

审稿时长

63 days

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.