Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato

This study explored the effectiveness of green zinc oxide nanoparticles (ZnO-NPs) foliar spray on tomato growth and oxidative stress relief under drought conditions. Tomato plant subjected to four water regimes (100, 75, 50, and 25% FC), and in the same while seedlings were sprayed with 25, 50, and...

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Autores principales:	Manal El-Zohri, Naseem A. Al-Wadaani, Sameera O. Bafeel
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	green nanoparticles water stress stress indicators antioxidants antioxidant enzymes Botany QK1-989
Acceso en línea:	https://doaj.org/article/46cca86a895e4ba9989cd6611c4c94f3
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spelling	oai:doaj.org-article:46cca86a895e4ba9989cd6611c4c94f32021-11-25T18:46:18ZFoliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato10.3390/plants101124002223-7747https://doaj.org/article/46cca86a895e4ba9989cd6611c4c94f32021-11-01T00:00:00Zhttps://www.mdpi.com/2223-7747/10/11/2400https://doaj.org/toc/2223-7747This study explored the effectiveness of green zinc oxide nanoparticles (ZnO-NPs) foliar spray on tomato growth and oxidative stress relief under drought conditions. Tomato plant subjected to four water regimes (100, 75, 50, and 25% FC), and in the same while seedlings were sprayed with 25, 50, and 100 mg/L green ZnO-NPs. The results showed that tomato growth parameters reduced significantly by increasing drought stress levels, while ZnO-NPs enhanced plant growth under all studied drought levels. Out of three ZnO-NPs concentrations tested, 25 and 50 mg/L ZnO-NPs proved to be the optimum treatments for alleviating drought stress. They increased shoot and root biomass compared to untreated controls. Application of 25 and 50 mg/L ZnO-NPs enhanced shoot dry weight by about 2–2.5-fold, respectively, under severe drought conditions (25%) compared to ZnO-NPs untreated plants. The application of 25 and 50 mg/L green ZnO-NPs decreased the drought-induced oxidative stress as indicated by the reduction in malondialdehyde and hydrogen peroxide concentrations compared to untreated controls. While 100 mg/L ZnO-NPs further increased oxidative stress. The beneficial effects of ZnO-NPs were evident in the plants’ defensive state, in which the concentration of ascorbic acid, free phenols, and the activity of superoxide dismutase, catalase, and ascorbate peroxidase were maintained at higher levels compared to NPs-untreated plants. At severe drought conditions, 25 mg/L ZnO-NPs induced SOD, CAT, and APX activity by about 3.99-, 3.23-, and 2.82-fold of their corresponding controls, respectively. Likewise, at 25% FC, SOD, CAT, and APX activity increased with 50 mg/L ZnO-NPs by about 4.58-, 3.57-, and 3.25-fold consecutively compared with their respective controls. Therefore, foliar use of green ZnO-NPs at lower concentrations might be suggested as an efficient way for enhancing tomato tolerance to drought stress.Manal El-ZohriNaseem A. Al-WadaaniSameera O. BafeelMDPI AGarticlegreen nanoparticleswater stressstress indicatorsantioxidantsantioxidant enzymesBotanyQK1-989ENPlants, Vol 10, Iss 2400, p 2400 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	green nanoparticles water stress stress indicators antioxidants antioxidant enzymes Botany QK1-989
spellingShingle	green nanoparticles water stress stress indicators antioxidants antioxidant enzymes Botany QK1-989 Manal El-Zohri Naseem A. Al-Wadaani Sameera O. Bafeel Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato
description	This study explored the effectiveness of green zinc oxide nanoparticles (ZnO-NPs) foliar spray on tomato growth and oxidative stress relief under drought conditions. Tomato plant subjected to four water regimes (100, 75, 50, and 25% FC), and in the same while seedlings were sprayed with 25, 50, and 100 mg/L green ZnO-NPs. The results showed that tomato growth parameters reduced significantly by increasing drought stress levels, while ZnO-NPs enhanced plant growth under all studied drought levels. Out of three ZnO-NPs concentrations tested, 25 and 50 mg/L ZnO-NPs proved to be the optimum treatments for alleviating drought stress. They increased shoot and root biomass compared to untreated controls. Application of 25 and 50 mg/L ZnO-NPs enhanced shoot dry weight by about 2–2.5-fold, respectively, under severe drought conditions (25%) compared to ZnO-NPs untreated plants. The application of 25 and 50 mg/L green ZnO-NPs decreased the drought-induced oxidative stress as indicated by the reduction in malondialdehyde and hydrogen peroxide concentrations compared to untreated controls. While 100 mg/L ZnO-NPs further increased oxidative stress. The beneficial effects of ZnO-NPs were evident in the plants’ defensive state, in which the concentration of ascorbic acid, free phenols, and the activity of superoxide dismutase, catalase, and ascorbate peroxidase were maintained at higher levels compared to NPs-untreated plants. At severe drought conditions, 25 mg/L ZnO-NPs induced SOD, CAT, and APX activity by about 3.99-, 3.23-, and 2.82-fold of their corresponding controls, respectively. Likewise, at 25% FC, SOD, CAT, and APX activity increased with 50 mg/L ZnO-NPs by about 4.58-, 3.57-, and 3.25-fold consecutively compared with their respective controls. Therefore, foliar use of green ZnO-NPs at lower concentrations might be suggested as an efficient way for enhancing tomato tolerance to drought stress.
format	article
author	Manal El-Zohri Naseem A. Al-Wadaani Sameera O. Bafeel
author_facet	Manal El-Zohri Naseem A. Al-Wadaani Sameera O. Bafeel
author_sort	Manal El-Zohri
title	Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato
title_short	Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato
title_full	Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato
title_fullStr	Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato
title_full_unstemmed	Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato
title_sort	foliar sprayed green zinc oxide nanoparticles mitigate drought-induced oxidative stress in tomato
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/46cca86a895e4ba9989cd6611c4c94f3
work_keys_str_mv	AT manalelzohri foliarsprayedgreenzincoxidenanoparticlesmitigatedroughtinducedoxidativestressintomato AT naseemaalwadaani foliarsprayedgreenzincoxidenanoparticlesmitigatedroughtinducedoxidativestressintomato AT sameeraobafeel foliarsprayedgreenzincoxidenanoparticlesmitigatedroughtinducedoxidativestressintomato
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Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato

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