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. 1992 Nov;100(3):1310–1317. doi: 10.1104/pp.100.3.1310

Slow Degradation of the D1 Protein Is Related to the Susceptibility of Low-Light-Grown Pumpkin Plants to Photoinhibition 1

Esa Tyystjärvi 1, Kati Ali-Yrkkö 1, Reetta Kettunen 1, Eva-Mari Aro 1
PMCID: PMC1075783  PMID: 16653122

Abstract

Photoinhibition of photosystem II (PSII) electron transport and subsequent degradation of the D1 protein were studied in pumpkin (Cucurbita pepo L.) leaves developed under high (1000 μmol m−2 s−1) and low (80 μmol m−2 s−1) photon flux densities. The low-light leaves were more susceptible to high light. This difference was greatly diminished when illumination was performed in the presence of chloramphenicol, indicating that a poor capacity to repair photodamaged PSII centers is decisive in the susceptibility of low-light leaves to photoinhibition. In fact, the first phases of the repair cycle, degradation and removal of photodamaged D1 protein from the reaction center complex, occurred slowly in low-light leaves, whereas in high-light leaves the degradation of the D1 protein more readily followed photoinhibition of PSII electron transport. A modified form of the D1 protein, with slightly slower electrophoretic mobility than the original D1, accumulated in the appressed thylakoid membranes of low-light leaves during illumination and was subsequently degraded only slowly.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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