ROS Metabolism of Citrus Fruits in Response to High-temperature-intense-light Stress
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摘要:
目的 研究柑橘果实响应高温、强光胁迫的活性氧代谢,为预防柑橘果实发生日灼以及果品优质生产提供依据。 方法 在环境调控生长室中模拟高温、强光诱导柑橘果实发生灼伤,并从果实灼伤病程的不同阶段入手,分析了果实灼伤病程中果皮活性氧代谢的变化规律。 结果 高温、强光胁迫使果皮中O2·-大量积累,LOX活性增强,脂质过氧化产物MDA含量显著上升。灼伤初期果皮呈现深黄色小斑点,SOD、POD和PPO活性均显著上升;随着灼伤病情的加剧,果皮变褐,POD活性仍增强,SOD活性显著下降且显著低于正常果,而PPO活性显著下降,但仍显著高于正常果;AsA和GSH含量在整个灼伤病程中均逐步下降。 结论 在高温、强光胁迫初期果皮呈现深黄色小斑点,柑橘果实果皮组织维持较高的活性氧清除能力,减缓了高温、强光对细胞膜的损伤。果皮呈现深黄色小斑点是预防柑橘果实果皮褐变的重要时间节点。 Abstract:Objective The reactive oxygen species (ROS) metabolism of citrus fruits under high temperature and intense light was studied in search for means to mitigate sunburn damage on the fruits. Method Sweet oranges, An-liu (Citrus sinensis Osbeck), grown in pots in an environmentally controlled chamber were exposed to artificial high-temperature-intense-light to create simulated burns on the fruits. Change on the ROS metabolism of the fruits as burn symptoms developed in normality and stages with appearance of dark yellow spots, slight browning, and seriously burnt coloration on the peel were monitored. Result Under the imposed stress, the O2·- and MDA contents and LOX activity in pericarp significantly increased. The activities of SOD, POD, and PPO were significantly raised with the appearance of dark yellow spots on the peels. As the browning intensified, SOD significantly fell below the normal level, POD continued to increase, and PPO significantly decreased but remained to be higher than normal. Under the stress, AsA and GSH in the fruits decreased continuously. Conclusion In the early stages, the high-temperature-intense-light stress began generating dark yellow spots on the orange pericarp. However, the fruit was able to sufficiently remove ROS diminishing or preventing damage on the cell membrane. Hence, it was the crucial time for implementation of measures to avoid sunburns on the fruits. -
图 1 诱导柑橘果实灼伤病程中果皮细胞的膜脂过氧化
注:Ⅰ为正常果,Ⅱ为斑点果,Ⅲ为轻度褐变果,Ⅳ为重度褐变果。图中不同小写字母表示差异显著(P < 0.05)。图 2~3同。
Figure 1. Changes in cell membrane lipid peroxidation of Citrus Fruits under high-temperature-intense-light stress
Note:Ⅰ.normal fruit, Ⅱ.dark yellow spots fruit, Ⅲ.slight browning fruit, Ⅳ.serious browning fruit.Different lowercase letters in the figure indicated significant differences (P < 0.05).The same as Fig. 2-3.
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