Title: Potassium application regulates nitrogen metabolism and osmotic adjustment in cotton (Gossypium hirsutum L.) functional leaf under drought stress

Journal of Plant Physiology
Rizwan ZahoorZhiguo Zhou

Abstract

To evaluate the role of potassium (K) in maintaining nitrogen metabolism and osmotic adjustment development of cotton functional leaves to sustain growth under soil drought and rewatering conditions, the plants of two cotton cultivars Siza 3 (low-K sensitive) and Simian 3 (low-K tolerant), were grown under three different K rates (K0, K1, and K2; 0, 150, and 300kgK2Oha-1, respectively) and exposed to drought stress with 40±5% soil relative water content (SRWC). The drought stress was applied at flowering stage by withholding water for eight days followed by rewatering to a well-watered level (75±5% SRWC). The results showed that drought-stressed plants of both cultivars showed a decrease in leaf relative water content (RWC) and osmotic potential in the functional leaves and developed osmotic adjustment with an increase in the contents of free amino acids, soluble sugars, inorganic K, and nitrate as compared to well-watered plants. In drought-stressed plants, nitrogen-metabolizing enzyme activities of nitrogen reductase (NR), glutamine synthetase (GS), and glutamate synthase (GOGAT) were diminished significantly (P≤0.05) along with decreased chlorophyll content and soluble proteins. However, drought-stressed plants under K appli...Continue Reading

Citations

Mar 7, 2020·Functional Plant Biology : FPB·Xianchen ZhangXiaochun Wan
Jan 12, 2021·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·A M AbdelmoghnyV N Waghmare
Jan 27, 2020·Plant Physiology and Biochemistry : PPB·Tengteng GaoChao Li
Jul 21, 2021·International Journal of Phytoremediation·Waqas Shafqat ChatthaFrans J M Maathuis

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