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[目的]探讨银杏不同部位叶片叶绿素荧光参数动态变化规律。[方法]以华北地区人工栽培的银杏为试材,研究了其不同部位叶片叶绿素荧光参数的日、季节动态变化规律。[结果]银杏叶片叶绿素荧光参数Fo、Fm、Fv、Fv/Fm、Fm/Fo、Fv/Fo的日变化呈现明显的先减小后增大的动态规律,一般在中午12:00达到最低值,向阳叶片的NPQ在中午时分达到最大值。银杏阴生叶的荧光参数Fm、Fv、Fv/Fm、Fm/Fo、Fv/Fo明显高于阳生叶,但NPQ最高峰出现时刻早于阳生叶,且峰值高于阳生叶,表明银杏阴生叶可能具有更为灵敏的热耗散机制。(3)与阳生叶相比,在不同测定时期阴生叶具有更高的PSⅡ潜在活性和内禀光能转换效率。[结论]为保扩银杏资源提供了理论依据。
[Objective] The research aimed to discuss the dynamic changes of chlorophyll fluorescence parameters in leaves of different parts of Ginkgo biloba. [Method] With artificial cultivation of Ginkgo biloba in North China as test material, the daily and seasonal dynamics of chlorophyll fluorescence parameters in different parts of leaves were studied. [Result] The daily change of chlorophyll fluorescence parameters Fo, Fm, Fv, Fv / Fm, Fm / Fo and Fv / Fo of Ginkgo biloba leaves showed the obvious dynamic rule of decreasing firstly and then increasing, and reached the lowest value at 12:00 noon , The NPQ of the sunning leaves reached a maximum at noon. The fluorescence parameters Fm, Fv, Fv / Fm, Fm / Fo, Fv / Fo of Yinxiangying were significantly higher than those of Yangshengye, but the peak of NPQ occurred earlier than that of Yangshengye and the peak value was higher than that of Yangshengye, Ginkgo shade leaf may have a more sensitive heat dissipation mechanism. (3) Shade leaf had higher PSⅡ potential activity and intrinsic light energy conversion efficiency at different measurement periods compared with that of the sun-born leaves. [Conclusion] This provided a theoretical basis for protecting Ginkgo biloba resources.