Department of Grassland Science, Animal Science and Technology College, Sichuan Agricultural University, Chengdu, 611130, China.
College of Agronomy, Sichuan Agricultural University, Chengdu, 611130, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Mar;28(11):13712-13724. doi: 10.1007/s11356-020-11612-3. Epub 2020 Nov 16.
Salt stress in agricultural soils is a global issue and little information is available about the efficiency of silver nanoparticles (AgNPs) in plants under salt stress. The aim of current study was to assess the efficacy of AgNPs in improving plant growth and reducing the salt-induced damages in pearl millet. The exposure of pearl millet plants grown in pots containing soil to different doses of salinity (0, 120, 150 mM) and AgNPs (0, 10, 20 and 30 mM) significantly influenced the morphology, physiology and yield-related attributes. Salt stress remarkably increased the concentration of sodium (Na) and chloride (Cl) in different organs of pearl millet plants. This led to increase the enhancement of hydrogen peroxide (HO) and malondialdehyde (MDA) content and caused severe oxidative damage by augmenting the activities of antioxidant enzymes. The obvious decrease in plant growth, height, dry biomass of root and shoot, chlorophylls and carotenoid contents was observed in salt-stressed plants which ultimately reduced the yield of plants. The AgNPs remarkably improved the plant growth by reducing oxidative stress and Na and Cl uptake by salt-stressed plants. The AgNPs were also found to maintain the ionic balance of cell (Na, K and Na/K ratio). The AgNPs improved the superoxide dismutase, catalase activities and decreased the peroxidase activity while reduced the HO and MDA contents in plants under salt stress. Overall, AgNPs increased the plant height, yield, and photosynthesis of salt-stressed plants in a dose-additive manner.
农业土壤中的盐胁迫是一个全球性问题，关于纳米银颗粒（AgNPs）在盐胁迫下对植物的效率的信息很少。本研究旨在评估 AgNPs 提高植物生长和减少珍珠粟盐诱导损伤的功效。在含有土壤的盆中种植珍珠粟植物，暴露于不同盐度（0、120、150mM）和 AgNPs（0、10、20 和 30mM）下，对其形态、生理和与产量相关的特性有显著影响。盐胁迫显著增加了珍珠粟植物不同器官中钠（Na）和氯（Cl）的浓度。这导致过氧化氢（HO）和丙二醛（MDA）含量增加，通过增加抗氧化酶的活性造成严重的氧化损伤。盐胁迫下植物的生长、高度、根和茎的干生物量、叶绿素和类胡萝卜素含量明显下降，最终降低了植物的产量。AgNPs 通过减少盐胁迫植物的氧化应激和 Na 和 Cl 的吸收，显著改善了植物的生长。AgNPs 还被发现维持细胞的离子平衡（Na、K 和 Na/K 比）。AgNPs 提高了超氧化物歧化酶、过氧化氢酶的活性，降低了过氧化物酶的活性，同时降低了盐胁迫下植物中的 HO 和 MDA 含量。总的来说，AgNPs 以剂量累加的方式增加了盐胁迫下植物的高度、产量和光合作用。
