Optimization of potassium supply under osmotic stress mitigates oxidative damage in barley

Tavakol, Ershad and Jákli, Bálint and Çakmak, İsmail and Dittert, Klaus and Senbayram, Mehmet (2022) Optimization of potassium supply under osmotic stress mitigates oxidative damage in barley. Plants, 11 (1). ISSN 2223-7747

Full text not available from this repository. (Request a copy)


Potassium (K) is the most abundant cation in plants, playing an important role in osmoregulation. Little is known about the effect of genotypic variation in the tolerance to osmotic stress under different K treatments in barley. In this study, we measured the interactive effects of osmotic stress and K supply on growth and stress responses of two barley cultivars (Hordeum vulgare L.) and monitored reactive oxygen species (ROS) along with enzymatic antioxidant activity and their respective gene expression level. The selected cultivars (cv. Milford and cv. Sahin-91Sahin-91) were exposed to osmotic stress (−0.7 MPa) induced by polyethylene glycol 6000 (PEG) under low (0.04 mM) and adequate (0.8 mM) K levels in the nutrient solution. Leaf samples were collected and analyzed for levels of K, ROS, kinetic activity of antioxidants enzymes and expression levels of respective genes during the stress period. The results showed that optimal K supply under osmotic stress significantly decreases ROS production and adjusts antioxidant activity, leading to the reduction of oxidative stress in the studied plants. The cultivar Milford had a lower ROS level and a better tolerance to stress compared to the cultivar Sahin-91. We conclude that optimized K supply is of great importance in mitigating ROS-related damage induced by osmotic stress, specifically in drought-sensitive barley cultivars.
Item Type: Article
Uncontrolled Keywords: Antioxidant activity; Antioxidant enzyme gene expression; K supply; Reactive oxygen species (ROS)
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: İsmail Çakmak
Date Deposited: 26 Aug 2022 17:30
Last Modified: 26 Aug 2022 17:30
URI: https://research.sabanciuniv.edu/id/eprint/43927

Actions (login required)

View Item
View Item