高温锻炼对苹果果皮适应突发性强光能力的影响

Effect of Preheating Acclimation on the Adaptation of Apple Fruit Peel to Sudden Excessive Sunlight

以苹果的套袋果实为试材,研究了离体条件下高温锻炼后果皮对自然强光的响应反应。结果表明:高温锻炼明显提高果皮POD和PPO活性,果皮甲醇提取物总抗氧化剂活性也明显提高,其中表儿茶素、绿原酸、水杨酸含量提高。高温锻炼后将除袋果实移至自然强光下,在短时间内果皮仍能维持较高的抗氧化能力,对强光胁迫产生的自由基的清除能力比对照果实强,从而可以延缓果实日烧症状的发生。

The responses of fruit peel to natural strong sunlight after heat acclimation were studied with bag-removed apples. The results indicated that the activities of peroxidase （POD） and polyphenol oxidase （PPO） in apple peel increased as a consequence of heat acclimation, and the contents of epicatechin, chlorogenic acid and salicylic acid （SA） increased. Meanwhile, the total antioxidant activities （TAA） of extraction from apple peel increased. Fruits exposed to natural strong sunlight after heat acclimation maintained higher antioxidant ability in fruit peel sometime during explosion, which suggested that preheating acclimation may render a higher ability of scavenging oxygenic free radicals to delay the appearance of fruit sunburn.