不同天气条件下银杏叶片光系统Ⅱ光化学活性日变化比较研究  

Comparative Studies on Diurnal Variations of Photochemistry Activities of PS Ⅱ in Ginkgo Leaves under Different Weather Conditions

作　　者：杨贤松[1] 谢海伟[1] 吕超田[1] 

机构地区：[1]蚌埠学院生物与食品工程系,安徽蚌埠233030

出　　处：《新乡学院学报》2011年第2期140-142,145,共4页Journal of Xinxiang University

基　　金：安徽省自然科学基金项目(11040606M79);安徽省高等学校自然科学基金项目(KJ2010B108)

摘　　要：以银杏叶片为材料,研究其在不同天气条件下光系统Ⅱ(PSⅡ)光化学活性的日变化。结果表明,晴天和阴天时叶片的PSⅡ最大量子效率(Fv/Fm)和PSⅡ潜在活性均先下降后上升,但上午晴天时叶片的Fv/Fm和Fv/Fo下降比阴天快,光抑制较严重。Fv/Fm和Fv/Fo都可以作为光抑制程度的可靠指标。1 d内的大部分时间里,晴天时银杏叶片PSⅡ反应中心单位面积吸收(ABS/CS)的能量、捕获(TRo/CS)的能量和热耗散(DIo/CS)的能量都比阴天时高,而用于电子传递(ETo/CS)的能量则相差不大。Diurnal variations of primary photochemical reactions in ginkgo（Ginkgo biloba L.） leaves under different weather conditions were investigated by chlorophyll a fluorescence transient measurement and the relevantly analytical method.The results showed that maximum quantum efficiency of PSⅡ（Photosystem Ⅱ）（Fv/Fm） and potential activities of PSⅡ（Fv/Fo） were first decline then rising,however,Fv/Fm and Fv/Fo decreased more drastically in sunny condition.Both Fv/Fm and Fv/Fo can be as reliable indicator of the degree of photoinhibition.Energy fluxes per excited cross-section for absorption（ABS/CS）,trapping（TRo/CS） and dissipation（DIo/CS） in ginkgo leaves in cloudy condition were higher than that in sunny condition,but energy fluxes per excited cross-section for electron transport（ETo/CS） has no significant difference in cloudy and sunny conditions.

关 键 词：银杏 日变化 光化学活性 

分 类 号：S664.3[农业科学—果树学] Q945.1[农业科学—园艺学]