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Siriwat Sakhonwasee,Wanalee Phingkasan 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.2
Many studies have investigated the impact of a single calcium salt on plant physiology under heat-stress,but it is difficult to determine the effect of calcium from those of its counterions. To address this, we investigatedcalcium-mediated heat tolerance in tomato seedlings using foliar sprays of four different salt solutions: CaCl2,CaNO3, MgCl2 or KNO3. 24 h heat-The application of CaCl2 and CaNO3 improved the operating efficiency ofphotosystem II (PSII) in the light-adapted state (ΦPSII), maximum quantum efficiency of PSII in the dark-adaptedstate (Fv/Fm), and the CO2 assimilation rate under the heat-stress condition. In contrast, the application of MgCl2 andKNO3 had no significant effect on ,those parameters. The application of CaCl2 and CaNO3 resulted in a lowerproduction of hydrogen peroxide, superoxide, and cell death than the heat-stressed control plants. The application ofMgCl2 and KNO3 also resulted in lower hydrogen peroxide and superoxide production, but to a lesser extent. Leafosmotic potential values of seedlings treated with the salt solutions were lower than the control.