扬麦5号旗叶光合功能衰退进程中光温逆境下PSⅠ特性的变化  

Changes in Characteristics of PSⅠfrom Flag Leaves of Yangmai No.5(Triticum aestivum L.)under Light temperature Stress during Photo-synthetic Functional Decline Process

作　　者：陈国祥[1] 何兵[1] 魏锦城[1] 张荣铣[2] 

机构地区：[1]南京师范大学生命科学学院,江苏南京210097 [2]南京农业大学农学系,江苏南京210095

出　　处：《作物学报》2000年第6期783-788,共6页Acta Agronomica Sinica

基　　金：江苏省教委自然科学基金资助项目

摘　　要：本文比较研究了高温强光逆境对扬麦 5号小麦旗叶光合功能衰退进程中光合膜 PSI组分及电子传递活性的影响。在光合功能的高值持续期 ,PS 颗粒电子传递活性较高 ,多肽组分相对稳定 ;进入光合功能速降期后电子传递活性快速下降 ,PS 颗粒的 L HC 和作用中心组分均发生不同程度降解。在光合功能的高值持续期 ,高温胁迫能加剧光逆境条件下 PS 活性下降程度和 LHC 等多肽组分损伤 ,而在光合功能衰退的速降期 ,PS 颗粒对光温敏感的多肽组分已基本降解 。After full expansion of flag leaf, the photosynthetic functional dec line process was divided into active photosynthetic duration and sharp fall phas e. During the active photosynthetic duration,the PS[KG-4]Ⅰ particles ma intained high er electron transport activities. The polypeptide components of PS[KG-4] Ⅰ particles remained relative steady. During the sharp fall phase, there was a rapid decreas e in electron transport activities of PS[KG-4]Ⅰ particles. LHC[KG- 4]Ⅰ and small molecula r polypeptide of PS[KG-4]Ⅰ particles were degraded. The strong light i nduced inactiv ation of PS[KG-4]Ⅰ electron transport at 37℃ was faster than that at 25℃, and the degradations of LHC[KG-4]Ⅰ and other polypeptide of PS[KG-4]Ⅰ particles were aggravated in active photosynthetic duration. However during the sharp fall phase,the PS[ KG-4]Ⅰ particles polypeptide components which were sensitive to light t emperature stre ss had been basically degraded,the adaptation and resistant capacity to light t emperature stress was remarkably declined.

关 键 词：光温逆境 扬麦5号 光合功能衰退进程 PS颗粒 多肽组分 电子传递活性 

分 类 号：Q945[生物学—植物学]