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Physiology and Effects of Potassium Chloride Treatment on Wax Apple (Syzgium samaragense Merr. et. perry.)
葉片的TTC 活性下降；同時處理天數增加，TTC 活性愈低。氯化鉀處理後
Some wax apple farmers use potassium chloride as a stress measurement to suppress vegetative growth and thus increase fruit quality. The treatment, however, occasionally causes severe injury to both trees and fruits. This study was initiated to investigate the effects of potassium chloride on the morphology and physiology of wax apple leaves. The mature leaves had necrotic lesions and burning symptom after being treated with potassium chloride at 8g/l for three days. Both young and mature leaves treated with either 4g/l or 8g/l had severe symptoms when treated for 6 days. Leaf potassium concentrations increased in accordance to the treated KCl concentratiocs and duration. The concentrations of calcium and magnesium in wax apple leaves were not affected by the treatments. Starch and total soluble sugar concentrations decreased in response to the increased KCl concentrations and treatment dates, respectively. While reducing sugar concentrations increased following the increase of KCl concentrations. Leaf free amino acid and soluble protein concen- trations were not affected by KCl treatments. However, free amino acid wax on the increase and soluble protein decrease when the treatment date was extended. Low KCl concentration stimulated TTC reaction while high KCl concentrations, 4g/l and 8g/l, reduced TTC activity in wax apple leaves. Leaf osmotic potential decreased with increasing treatment concentration. The severity of impaired membrance integrity was found to be proportional to the enhancement of KCl concentration and treatment duration as indicated by the leakage test.
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