珠芽蓼叶绿素激发荧光比值和叶绿体超微结构的探讨  

DISCUSSION BETWEEN THE RATIOS OF EXCITATION FLUORESCENCE AND THE CHLOROPLAST ULTRASTRUCTURES OF POLYGONUM VIVIPARUM GROWN

作　　者：易现峰[1] 郭淑华 

机构地区：[1]青海大学农牧学院农学系,青海西宁810016 [2]山东省维坊市昌维师专生物系,205400

出　　处：《青海草业》2000年第4期1-3,共3页Qinghai Prataculture

基　　金：国家自然科学基金(编号:39570129)

摘　　要：魏捷等 (1 998)对不同海拔地区珠芽蓼激发荧光F736 F689比值的研究结果表明 ,F736 F689比值随着海拔的升高而降低 ,说明光能随海拔升高更有利于向PSII分配。但对叶绿体超微结构的观测发现 ,随着海拔的升高 ,叶绿体基粒片层逐渐减少 ,基质片层逐渐增多。PSII随着海拔升高而减少 ,PSI却相反。较少的PSII和LHC -II分配较多的激发能 ,可能在于基质中存在较多的游离的LHC -II和LHC -I,它们有利于状态II向状态I的转换 ,使激发能有利于向PSII分配 ,从而使两个光系统间的光能分配达到平衡 。Wei jie's study on the ratios of excitation fluorescence F 736 /F 689 showed that the ration of F 736 /F 689 decreased gradually with elevating altitude which indicated that high elevation facilitated energy distribution to PSII.Observation on ultrastructure of chloroplasts revealed that the degree of grana stocking tended to decrease with upgrading of altitude,which meant lower contents of PSII and LHC-II.Lower contents of PSIIand LHC-II entrapping larger amount of excitation energy speculated that there must be a lot of free LHC-IIand LHC-I in stroma. Flow of free LHC-II and LHC-I producing“state II to state I”transition benefits energy distribution to PSII to establish a balance between the two photosystems(PSI and PSII)and sustain higher photochemical efficiency and activiity of PSII.

关 键 词：珠芽蓼 激发荧光F_(736)/F_(689)比值 超微结构 状态转换 

分 类 号：S162.5[农业科学—农业气象学]