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Article

High Nitrogen Enhance Drought Tolerance in Cotton through Antioxidant Enzymatic Activities, Nitrogen Metabolism and Osmotic Adjustment

State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455000, China
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Plants 2020, 9(2), 178; https://doi.org/10.3390/plants9020178
Received: 31 December 2019 / Revised: 21 January 2020 / Accepted: 21 January 2020 / Published: 1 February 2020
(This article belongs to the Special Issue Mineral Nutrition and Plant Abiotic Stress Resistance)
Drought is one of the most important abiotic stresses and hampers many plant physiological processes under suboptimal nitrogen (N) concentration. Seedling tolerance to drought stress is very important for optimum growth and development, however, the enhancement of plant stress tolerance through N application in cotton is not fully understood. Therefore, this study investigates the role of high N concentration in enhancing drought stress tolerance in cotton. A hydroponic experiment supplying low (0.25 mM) and high (5 mM) N concentrations, followed by 150 g L−1 polyethylene glycol (PEG)-induced stress was conducted in a growth chamber. PEG-induced drought stress inhibited seedling growth, led to oxidative stress from excessive malondialdehyde (MDA) generation, and reduced N metabolism. High N concentrations alleviated oxidative damage and stomatal limitation by increasing antioxidant enzymatic activities, leaf relative water content, and photosynthesis in cotton seedlings under drought stress. The results revealed that the ameliorative effects of high N concentration may be ascribed to the enhancement of N metabolizing enzymes and an increase in the amounts of osmoprotectants like free amino acids and total soluble protein. The present data suggest that relatively high N concentrations may contribute to drought stress tolerance in cotton through N metabolism, antioxidant capacity, and osmotic adjustment. View Full-Text
Keywords: cotton; nitrogen; drought stress; nitrogen metabolism; enzyme activities; osmotic adjustment cotton; nitrogen; drought stress; nitrogen metabolism; enzyme activities; osmotic adjustment
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MDPI and ACS Style

Iqbal, A.; Dong, Q.; Wang, X.; Gui, H.; Zhang, H.; Zhang, X.; Song, M. High Nitrogen Enhance Drought Tolerance in Cotton through Antioxidant Enzymatic Activities, Nitrogen Metabolism and Osmotic Adjustment. Plants 2020, 9, 178. https://doi.org/10.3390/plants9020178

AMA Style

Iqbal A, Dong Q, Wang X, Gui H, Zhang H, Zhang X, Song M. High Nitrogen Enhance Drought Tolerance in Cotton through Antioxidant Enzymatic Activities, Nitrogen Metabolism and Osmotic Adjustment. Plants. 2020; 9(2):178. https://doi.org/10.3390/plants9020178

Chicago/Turabian Style

Iqbal, Asif; Dong, Qiang; Wang, Xiangru; Gui, Huiping; Zhang, Hengheng; Zhang, Xiling; Song, Meizhen. 2020. "High Nitrogen Enhance Drought Tolerance in Cotton through Antioxidant Enzymatic Activities, Nitrogen Metabolism and Osmotic Adjustment" Plants 9, no. 2: 178. https://doi.org/10.3390/plants9020178

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