Department of Biological Sciences, Faculty of Science, King Abdulaziz University, 21589 Jeddah, Saudi Arabia.
Department of Environmental Sciences and Engineering, Government College University Faisalabad, 38000, Pakistan.
Ecotoxicol Environ Saf. 2021 Sep 15;221:112436. doi: 10.1016/j.ecoenv.2021.112436. Epub 2021 Jun 22.
Nanoparticles (NPs), as a novel source of industrial materials, have been extensively used in recent years which ultimately ends up in soils and may cause toxic effects on plants. Gibberellic acid (GA), phytohormone, has ability to minimize abiotic stresses in plants. The role of GA in minimizing titanium dioxide (TiO) NPs stress in plants is still unknown. In current study, soil was spiked with TiO NPs (0, 100, 200, 400, 600 mg/kg) while GA was foliar-sprayed at different concentrations during wheat growth. The findings revealed that TiO NPs increased the growth, chlorophyll contents, and nutrient (P, K, Fe, Mn) concentrations in tissues till 400 mg/kg and then decrease was observed at 600 mg/kg level of NPs whereas the values of these parameters were higher compared to control irrespective of NPs levels. The NPs enhanced the antioxidant activities (SOD, POD, CAT, APX) and reduced the oxidative stress (EL, HO, MDA) in leaves over the control. Foliar GA further improved the growth, yield, nutrients and antioxidant activities while minimized the oxidative stress compared to respective sole NPs- treatments. The interactive effects of NPs and GA were dose dependent. The results proved that studied doses of TiO NPs were not toxic to wheat plants except the highest level (600 mg/kg) used and GA positively affected the yield of wheat under TiO NPs application. The GA can be used to improve crop growth in the presence of NPs which, however, needs further investigation at higher doses of TiO NPs in various crops.
纳米粒子(NPs)作为一种新型工业材料,近年来被广泛应用,最终进入土壤,并可能对植物产生毒性作用。赤霉素(GA)作为一种植物激素,具有减轻植物非生物胁迫的能力。GA 在减轻植物中二氧化钛(TiO)NPs 胁迫方面的作用尚不清楚。在本研究中,土壤中添加了 TiO NPs(0、100、200、400、600mg/kg),同时在小麦生长过程中叶面喷施不同浓度的 GA。结果表明,TiO NPs 增加了小麦的生长、叶绿素含量和组织中的养分(P、K、Fe、Mn)浓度,直到 400mg/kg,然后在 600mg/kg 水平的 NPs 下观察到下降,而这些参数的值高于对照,无论 NPs 水平如何。NPs 增强了叶片中的抗氧化活性(SOD、POD、CAT、APX),并减轻了氧化应激(EL、HO、MDA)。与单独的 NPs 处理相比,叶面 GA 进一步提高了生长、产量、养分和抗氧化活性,同时减轻了氧化应激。NPs 和 GA 的相互作用是剂量依赖的。结果证明,研究剂量的 TiO NPs 对小麦植物没有毒性,除了最高剂量(600mg/kg)外,GA 还能在 TiO NPs 应用下提高小麦的产量。GA 可用于在存在 NPs 的情况下改善作物生长,但需要在更高剂量的 TiO NPs 下在各种作物中进一步研究。