氯化鈣預處理對減輕甜椒幼苗受淹水傷害之效果

Effect of Calcium Chloride Pre-treatment on the Alleviation of Waterlogging Damage in Sweet Pepper Seedlings

臺灣春夏雨季常遭受梅雨或豪雨侵襲，引起土壤淹水，易損害蔬菜品質與產量。本試驗調查預施氯化鈣對甜椒「翠美星」幼苗遭遇淹水逆境時之生長及其氧化逆境程度和自由基清除系統的影響。幼苗自第三片本葉完全展開時開始，澆灌氯化鈣溶液3次，每次間隔7天。然後做淹水處理7天，再離水回復12天。最後調查之結果，施用氯化鈣的甜椒幼苗增加生長量及生物量，減少葉片電解質滲漏，減少丙二醛、超氧陰離子和過氧化氫含量，以及增加葉片超氧歧化酶、過氧化氫酶、抗壞血酸過氧化酶和麩胱甘肽還原酶活性。事前處理75 mM氯化鈣顯著減輕了淹水的危害。 In Taiwan, growing vegetables often suffer from waterlogged caused by monsoon rain or cloudbursts during spring and summer. In this study, the plant growth, oxidative stress levels, and the free radical scavenging system of waterlogged sweet pepper 'Trim Star' seedlings with or without calcium chloride (CaCl2) pre-treatment were investigated. CaCl2 solutions were applied to the growing medium for 3 times at 7-day intervals beginning at the time when each seedling had 3 true leaves. Then the seedlings were subject to waterlogged for 7 days followed by 12 days of recovering growth under normal conditions before final evaluation. CaCl2 application increased the growth in size and biomass, decreased the electrolyte leakage, decreased contents of malonaldehyde, superoxide anion, and hydrogen peroxide, and promoted the activities of superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase of the waterlogged seedlings. Application of 75 mM CaCl2 significantly alleviated the damage of waterlogged in sweet pepper seedlings.