期刊
PLANT AND CELL PHYSIOLOGY
卷 47, 期 2, 页码 270-276出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pci245
关键词
chilling; cucumber (Cucumis sativus L.); photoinhibiton; PSI; reactive oxygen species; Rubisco
Previous studies have demonstrated that the large subunit (LSU) of ribulose-1,5-bisphosphate carboxylase (Rubisco) is site-specifically cleaved by a hydroxyl radical (center dot OH) generated in the illuminated chloroplast lysates or by an artificial center dot OH-generating system. However, it is not known whether such cleavage of the LSU by reactive oxygen species (ROS) actually occurs in an intact leaf. When leaf discs of chilling-sensitive cucumber (Cucumis sativus L.) were illuminated at 4 degrees C, five major fragments of the LSU were observed. This fragmentation was completely inhibited by ROS scavengers, such as n-propyl gallate (for center dot OH) and 1,2-dihydroxybenzene-3,5-disulfonic acid (Tiron) (for superoxide). FeSO4 stimulated this fragmentation, whereas an iron-specific chelator, deferoxamine, suppressed it. Furthermore, such fragments were identical to those generated from the purified Rubisco by an center dot OH-generating system in vitro on two-dimensional PAGE. These results indicate that the direct fragmentation of the LSU by reacive oxygen species also occurs in an intact leaf.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据