Before sunburn symptoms appear, the activities of SOD and POD increase within a certain range of stress, but after sunburn symptoms are visual, the SOD activity decreases with the advance of fruit sunburn.
果实日灼症状出现前，在一定高温和强光胁迫范围内，细胞内保护性酶SOD和POD随着胁迫的加重而上升，以消除环境胁迫带来的不利影响；但在果实日灼症状出现后，保护酶的作用行为便发生了变化。
参考来源 - 苹果果实对高温、强光胁迫的反应及其抗性机理研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Apple fruit sunburn, a common physiological disorder, happens widely in main apple-producing areas on the world and results in a huge loss annually.
苹果果实日灼是一种常见的生理病害，每年在世界各主要苹果产区均有发生，给生产造成巨大损失。
A special inducing device for fruit sunburn was made to study the "threshold temperatures"with attached fruit. The results showed that, the device worked perfectly in calm, clear and sunny days.
使用自制的日灼诱导设备，在无风或微风的晴天对活体果实进行田间日灼诱导，通过改变诱导室内的气温来控制和调节果面温度，从而确定了不同苹果品种果实发生日灼的阈值温度。
Plants can get sunburn. Yellow spots may appear on their leaves and fruit.
植物会被晒伤，叶子和果实上可能会出现黄色斑点。
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