圆二色光谱揭示光系统Ⅱ在热处理过程中叶绿素荧光动力学变化的原因
摘要
研究了光系统Ⅱ(PSⅡ)在热处理过程中的叶绿素α荧光和圆二色(CD)光谱。在30℃～40℃热处理过程中，PSⅡ的叶绿素荧光参数Fo′保持稳定不变；当温度大于40℃时，Fo′逐渐升高并在55℃达到最大值。在PSⅡ颗粒和富含捕光色素(LHCⅡ)的复合物的热处理过程中，具有超大振幅的CD异常信号出现，并且在40℃时，677nm的异常CD峰强度达到最大。这些结果暗示在PSⅡ颗粒热处理过程中，PSⅡ颗粒中的LHCⅡ的聚集状态和异常CD信号相关，并且也可能是影响Fo′的一个重要因素。
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