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Muhammad Amjad,Javaid Akhtar,Behzad Murtaza,Ghulam Abbas,Husnain Jawad 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.3
To quantify the effect of two potassium levels (4.5 and 9.0 mM) on salt tolerance, we conducted a solution culture experiment using salt-tolerant (Nagina) and salt-sensitive (Peto-86) Solanum lycopersicum (tomato) cultivars grown under NaCl stress (0, 75, and 150 mM). Potassium is known to minimize oxidative stress and enhance photosynthesis in salt-stressed plants. A 30-day treatment with potassium, differentially increased stomatal conductance and transpiration, decreased oxidative stress, lowered the activities of antioxidant enzymes (i.e., superoxide dismutase, catalase, and glutathione reductase), increased leaf K+ levels and the K+/Na+ ratio, and improved the membrane stability index in the salt-tolerant and salt-sensitive tomato cultivars exposed to salt stress. The salt-sensitive cultivar had significantly higher malondialdehyde (MDA) concentrations and lower antioxidant enzyme activity than the salt-tolerant cultivar. These results indicate that potassium can be used to alleviate salt-induced oxidative stress and photosynthetic limitations in tomato plants and ultimately improve survival under salt stress.