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Nanosilicon-based recovery of barley (Hordeum vulgare) plants subjected to drought stress
Environmental Science: Nano ( IF 7.3 ) Pub Date : 2020/01/06 , DOI: 10.1039/c9en00973f
Mansour Ghorbanpour 1, 2, 3, 4, 5 , Hamid Mohammadi 5, 6, 7, 8 , Khalil Kariman 9, 10, 11, 12
Affiliation  

The present study explores the potential impact of silicon nanoparticles (Si NPs), in comparison with their bulk counterpart (silicate), on post-stress recovery performance of barley (Hordeum vulgare) seedlings under different drought stress intensities during vegetative growth. Barley plants were grown under 100% field capacity (FC), or mild (75% FC), moderate (50% FC) and severe (25% FC) drought stress levels, and were subsequently recovered by different treatments including soil application of 150 mL of Si NPs and silicate (at 125 and 250 mg Si L−1), and water. Si NPs application at 250 mg L−1 led to formation of Si NP aggregates in plant tissues, large pores in roots, and also rapid stomata closure in leaves. However, the lower Si NPs dose (125 mg Si L−1) was accompanied by a wider distribution of Si NPs in cells, and formation of a regular porosity pattern in roots i.e. more frequent pores of a smaller size. Upon recovery from all the drought stress levels, shoot biomass increased significantly in recovered plants compared to the respective non-recovered controls, and the maximum shoot biomass increase (27.3%) belonged to the moderate-stressed plants treated with Si NPs at 125 mg L−1. Exposure to Si NPs and silicate (at both doses) after all drought stress intensities caused a significant increase in total chlorophyll (up to 17.1%) and carotenoid (up to 24.1%) content of leaves except for the carotenoid content under severe drought stress. Post-drought recovery with Si NPs and silicate was linked to alterations in the plant osmolyte and metabolite profile, cellular injury and membrane stability indices, and the activity of antioxidant enzymes. Soil application of Si NPs (at a low dose of 125 mg Si L−1) showed a promising potential for post-drought recovery of barley plants via modifying plant morpho-physiological and antioxidative attributes and synthesis of specific metabolites.

中文翻译:

干旱胁迫下基于大分子硅的大麦(Hordeum vulgare)植物的恢复

本研究探讨了硅纳米颗粒(Si NPs)与大块硅酸盐(硅酸盐)相比,在营养生长过程中不同干旱胁迫强度下对大麦(Hordeum vulgare)幼苗的胁迫后恢复性能的潜在影响。大麦植物在100%田间持水量(FC)或中度(75%FC),中度(50%FC)和严重(25%FC)干旱胁迫下生长,随后通过不同的处理(包括在土壤中施用150种)进行恢复。毫升的硅纳米颗粒和硅酸盐(分别为125和250毫克硅L -1)和水。Si NPs的施用量为250 mg L -1导致在植物组织中形成Si NP聚集体,在根部形成大孔,并在叶片中迅速关闭气孔。但是,较低的Si NPs剂量(125 mg Si L-1)伴随着Si NP在细胞中的分布更广泛,并且在根部形成规则的孔隙模式,更频繁的小尺寸孔。从所有干旱胁迫水平中恢复后,与未恢复的对照相比,恢复的植物中茎生物量显着增加,最大的茎生物量增加(27.3%)属于经125 mg L Si NP处理的中等胁迫植物-1。在所有干旱胁迫强度下,暴露于Si NPs和硅酸盐(两种剂量)都会使叶片的总叶绿素含量(高达17.1%)和类胡萝卜素(含量高达24.1%)显着增加,但严重干旱胁迫下的类胡萝卜素含量除外。Si NP和硅酸盐的干旱后恢复与植物渗透压和代谢产物分布,细胞损伤和膜稳定性指数以及抗氧化酶活性的改变有关。在土壤中施用硅纳米粒(低剂量125 mg Si L -1)显示出通过改变植物的形态生理和抗氧化特性以及特定代谢产物的合成,有可能在大麦植物中进行干旱后恢复。
更新日期:2020-02-20
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