Chlorophyll fluorescence analysis technique and HPLC system were used to investigate changes of thermal dissipation through xanthophyll cycle under high irradiance and xanthophyll cycle components in streptomycin(SM) treated maize leaves. In the presence of SM, the maximum PSⅡ quantum yield (Fv/Fm) and electron transport rate (ETR) of maize leaves decreased more significantly under high light compared to that in control. Non-photochemical quenching (NPQ) and de-epoxidation level of xanthophyll cycle components in maize leaves were enhanced by SM treatment. However,‘high energy'quenching (qE), a major components of NPQ declined gradually in SM poisoned maize leaves subjected to strong irradiance. It has been suggested that the decline of thermal dissipation through xanthophyll cycle is mainly due to decrease in electron transport rate by SM-treatment in maize leaves.%利用叶绿素荧光分析技术和高效液相色谱研究了链霉素(SM,叶绿体基因编码蛋白的抑制剂)处理玉米叶片的叶黄素循环及依赖叶黄素循环的热耗散.与对照相比,强光下SM处理叶片的最大光化学效率(Fv/Fm)降低且不能完全恢复,同时电子传递速率(ETR)显著下降.而且,SM处理叶片的非光化学猝灭(NPQ)和叶黄素循环的脱环氧化水平增加.但是,NPQ的主要组分高能态(qE)猝灭减小.因此,推测qE的降低可能与电子传递速率降低有关.
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