Melatonin enhances metal oxide nanoparticles tolerance in rice seedlings through dual regulation of antioxidant defense and photosynthetic efficiency.

IF 5.4 2区 生物学 Q1 PLANT SCIENCES Physiologia plantarum Pub Date : 2024-11-01 DOI:10.1111/ppl.70020
Ahmed Gharib, Yanze Su, Zhihao Zuo, Rujia Chen, Hanyao Wang, Tianyun Tao, Mingli Chuan, Qing Bu, Yanmo Luo, Yaoqing Li, Shuting Wang, Yu Hua, Yi Ji, Jianheng Ding, Wei Liu, Shuihua He, Pengcheng Li, Yang Xu, Chenwu Xu, Yue Lu, Zefeng Yang
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Abstract

The growing utilization of metal oxide nanoparticles (MONPs) presents novel and potential hazards to plants. However, the impacts of MONPs on plants and the mechanisms underlying their tolerance to MONPs remain unclear. In this study, we demonstrated that both CuO and ZnO nanoparticles hindered plant growth and triggered oxidative damage in rice seedlings. The role of melatonin in rice tolerance to MONPs was elucidated through a comprehensive analysis of OsCOMT mutant and overexpression plants, which showed melatonin deficiency and sufficiency, respectively. Our results revealed that the melatonin-deficient OsCOMT mutant plants exhibited hypersensitivity to MONPs, while the melatonin-sufficient OsCOMT overexpression plants showed enhanced MONPs tolerance. Physiological assessments further indicated that melatonin counteracted rice oxidative damage triggered by MONPs by increasing the activities of antioxidative enzymes, including superoxide dismutase, peroxidase, catalase, and glutathione reductase. Moreover, melatonin was found to foster rice growth under MONP stress by positively regulating the maximum photochemical efficiency, reducing non-photochemical fluorescence quenching, and promoting the biosynthesis of sucrose and starch. These findings not only highlight the hazardous effects of MONPs on plants, but also underscore the pivotal role of melatonin in bolstering plant resilience against MONPs.

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金属氧化物纳米粒子(MONPs)的使用日益增多,给植物带来了新的潜在危害。然而,MONPs 对植物的影响以及植物耐受 MONPs 的机制仍不清楚。在这项研究中,我们证明了 CuO 和 ZnO 纳米粒子都会阻碍植物生长并引发水稻幼苗的氧化损伤。通过对OsCOMT突变体和过表达植株的综合分析,我们阐明了褪黑激素在水稻耐受MONPs中的作用。我们的结果表明,褪黑激素缺乏的 OsCOMT 突变体植株对 MONPs 表现出超敏反应,而褪黑激素充足的 OsCOMT 过表达植株则对 MONPs 表现出更强的耐受性。生理学评估进一步表明,褪黑激素通过提高超氧化物歧化酶、过氧化物酶、过氧化氢酶和谷胱甘肽还原酶等抗氧化酶的活性,抵消了 MONPs 引发的水稻氧化损伤。此外,研究还发现,褪黑素可通过正向调节最大光化学效率、减少非光化学荧光淬灭以及促进蔗糖和淀粉的生物合成,促进水稻在 MONP 胁迫下的生长。这些发现不仅凸显了单抗对植物的有害影响,还强调了褪黑激素在增强植物抵御单抗的能力方面的关键作用。
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来源期刊
Physiologia plantarum
Physiologia plantarum 生物-植物科学
CiteScore
11.00
自引率
3.10%
发文量
224
审稿时长
3.9 months
期刊介绍: Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.
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