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Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment

Potassium (K) is known for alleviating the negative effects of abiotic stresses on plants. To explore the functions of K in controlling reactive oxygen species (ROS), antioxidant activities, and osmoregulation in sesame under drought stress, a pot experiment was conducted with three K levels (0, 60,...

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Autores principales: Fang, Sheng, Yang, Huiyi, Wei, Guangwei, Shen, Tinghai, Wan, Zehua, Wang, Min, Wang, Xiaohui, Wu, Ziming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9791050/
https://www.ncbi.nlm.nih.gov/pubmed/36578346
http://dx.doi.org/10.3389/fpls.2022.1096606
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author Fang, Sheng
Yang, Huiyi
Wei, Guangwei
Shen, Tinghai
Wan, Zehua
Wang, Min
Wang, Xiaohui
Wu, Ziming
author_facet Fang, Sheng
Yang, Huiyi
Wei, Guangwei
Shen, Tinghai
Wan, Zehua
Wang, Min
Wang, Xiaohui
Wu, Ziming
author_sort Fang, Sheng
collection PubMed
description Potassium (K) is known for alleviating the negative effects of abiotic stresses on plants. To explore the functions of K in controlling reactive oxygen species (ROS), antioxidant activities, and osmoregulation in sesame under drought stress, a pot experiment was conducted with three K levels (0, 60, and 120 kg ha(–1), recorded as K0, K1, and K2, respectively) and exposed to well-watered (WW, 75% ± 5% soil relative water content) and drought-stressed (DS, 50% ± 5% soil relative water content) conditions. The results showed that DS stimulated the production of ROS such as increased hydrogen peroxide (H(2)O(2)), leading to lipid peroxidation as characterized by higher malondialdehyde (MDA) and, consequently, resulting in the decline in relative water content (RWC) and photosynthetic pigments as compared with WW plants. These adverse effects were exacerbated when drought stress was prolonged. Concurrently, K application alleviated the magnitude of decline in the RWC, chlorophyll a, and chlorophyll b, and plants applied with K exhibited superior growth, with the optimal mitigation observed under K2 treatment. Additionally, DS plants treated with K exhibited lower lipid peroxidation, higher antioxidant activities, and increased osmotic solute accumulation in comparison with plants under K deficiency, which suggested that exogenous K application mitigated the oxidative damages and this was more prominent under K2 treatment. Noteworthily, proline and soluble protein, respectively, dominated in the osmotic regulation at 3 and 6 days of drought stress according to the analysis of the quantitative comparison among different osmotically active solutes. Based on the correlation of the aforementioned traits and the analysis of variance on the interaction effects of drought stress and potassium, we propose that superoxide dismutase (SOD), glutathione reductase (GR), and MDA could be critical indicators in balancing ROS detoxification and reproduction. In summary, our studies suggest that optimized K application keeps a balance between the production of antioxidants and ROS and simultaneously affects osmoregulation to alleviate the damage from drought stress.
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spelling pubmed-97910502022-12-27 Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment Fang, Sheng Yang, Huiyi Wei, Guangwei Shen, Tinghai Wan, Zehua Wang, Min Wang, Xiaohui Wu, Ziming Front Plant Sci Plant Science Potassium (K) is known for alleviating the negative effects of abiotic stresses on plants. To explore the functions of K in controlling reactive oxygen species (ROS), antioxidant activities, and osmoregulation in sesame under drought stress, a pot experiment was conducted with three K levels (0, 60, and 120 kg ha(–1), recorded as K0, K1, and K2, respectively) and exposed to well-watered (WW, 75% ± 5% soil relative water content) and drought-stressed (DS, 50% ± 5% soil relative water content) conditions. The results showed that DS stimulated the production of ROS such as increased hydrogen peroxide (H(2)O(2)), leading to lipid peroxidation as characterized by higher malondialdehyde (MDA) and, consequently, resulting in the decline in relative water content (RWC) and photosynthetic pigments as compared with WW plants. These adverse effects were exacerbated when drought stress was prolonged. Concurrently, K application alleviated the magnitude of decline in the RWC, chlorophyll a, and chlorophyll b, and plants applied with K exhibited superior growth, with the optimal mitigation observed under K2 treatment. Additionally, DS plants treated with K exhibited lower lipid peroxidation, higher antioxidant activities, and increased osmotic solute accumulation in comparison with plants under K deficiency, which suggested that exogenous K application mitigated the oxidative damages and this was more prominent under K2 treatment. Noteworthily, proline and soluble protein, respectively, dominated in the osmotic regulation at 3 and 6 days of drought stress according to the analysis of the quantitative comparison among different osmotically active solutes. Based on the correlation of the aforementioned traits and the analysis of variance on the interaction effects of drought stress and potassium, we propose that superoxide dismutase (SOD), glutathione reductase (GR), and MDA could be critical indicators in balancing ROS detoxification and reproduction. In summary, our studies suggest that optimized K application keeps a balance between the production of antioxidants and ROS and simultaneously affects osmoregulation to alleviate the damage from drought stress. Frontiers Media S.A. 2022-12-12 /pmc/articles/PMC9791050/ /pubmed/36578346 http://dx.doi.org/10.3389/fpls.2022.1096606 Text en Copyright © 2022 Fang, Yang, Wei, Shen, Wan, Wang, Wang and Wu https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Fang, Sheng
Yang, Huiyi
Wei, Guangwei
Shen, Tinghai
Wan, Zehua
Wang, Min
Wang, Xiaohui
Wu, Ziming
Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
title Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
title_full Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
title_fullStr Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
title_full_unstemmed Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
title_short Potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
title_sort potassium application enhances drought tolerance in sesame by mitigating oxidative damage and regulating osmotic adjustment
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9791050/
https://www.ncbi.nlm.nih.gov/pubmed/36578346
http://dx.doi.org/10.3389/fpls.2022.1096606
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