Photoinhibition of Photosystem I damages both reaction centre proteins PSI-A and PSI-B and acceptor-side located small Photosystem I polypeptides

被引：68

作者：

Tjus S.E. ^{[1
]}

Møller B.L. ^{[1
]}

Scheller H.V. ^{[1
]}

机构：

[1] Plant Biochemistry Laboratory, Department of Plant Biology, Roy. Vet. and Agric. University, DK-1871 Frederiksberg C, Copenhagen

来源：

Photosynthesis Research | 1999年 / 60卷 / 1期

关键词：

Active oxygen species; Cold stress; Light stress; Oxygen scavengers; Superoxide;

D O I：

10.1023/A:1006283618695

中图分类号：

学科分类号：

摘要：

Photoinhibition of Photosystem I at chilling temperatures was investigated. Illumination of barley and cucumber leaves at 4°C induced a lowered Photosystem I activity. In barley, the reaction centre proteins PSI-A and PSI-B were both partially degraded as was the nuclear-encoded PSI-D polypeptide. Barley leaves infiltrated with KCN to increase oxidative stress, showed increased photoinhibition of Photosystem I, including reduced photochemical activity and marked degradation of several Photosystem I polypeptides. The most rapid and pronounced degradation was found in the PSI-D and PSI-E polypeptides exposed at the Photosystem I acceptor side. The PSI-A, -B, -C, -G, -H, -K and -L polypeptides were less extensively damaged. No damage of the lumenally oriented PSI-F and -N polypeptides was detected. The elevated photoinhibition of Photosystem I seen in KCN treated barley is most likely induced by a combination of increased active oxygen due to inhibited scavenging and increased accumulation of reducing power due to inhibition of the Calvin cycle. In barley, photo-inactivation of Photosystem 1 closely followed the degradation of PSI-A and PSI-B. Illumination of cucumber resulted in a pronounced loss of activity and appearance of specific PSI-A and PSI-B degradation products whereas the total PSI-A/B degradation was small. The PSI-A/B degradation identified in barley is interpreted to reflect a physiologically relevant process being part of a repair cycle, whereas the much smaller PSI-A/B degradation observed in cucumber is interpreted to represent an irreversible damage induced far below the temperature tolerance for cucumber.

引用

页码：75 / 86

页数：11

共 45 条

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