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. 1990 Dec;94(4):1663–1670. doi: 10.1104/pp.94.4.1663

Effects of High Light Stress on Carotenoid-Deficient Chloroplasts in Pisum sativum1

Anurag D Sagar 1,2,2, Winslow R Briggs 1,2
PMCID: PMC1077435  PMID: 16667900

Abstract

The effects of high light stress on chloroplast ultrastructure and protein and mRNA composition were investigated in carotenoid-deficient peas (Pisum sativum, L.). In low light, the thylakoid membrane polypeptide pattern was altered, with several prominent chlorophyll-binding proteins present in diminished amounts. This change was found to be reflected in the ultrastructural organization of internal chloroplast membranes. In contrast to the normal grana stacking found in the controls, carotenoid-deficient plastids contained long, unstacked lamellae. Exposure to photooxidative light that resulted in destruction of >70% of chlorophyll did not lead to changes in total RNA and total cellular protein patterns. This treatment did lead to gross alterations in the chloroplast structure. Within 24 hours the plastid was seen as a swollen vesicle with only a few membrane remnants still present. Accumulation of five plastid-encoded mRNAs encoding a diverse array of photosynthetic proteins was found to be affected in different ways. While psaA mRNA was rapidly reduced by more than 75%, levels of psbF/E and atpB/E were reduced by 50%. psbA and petA mRNAs, on the other hand, appeared to be more resistant to photobleaching and remained relatively unchanged during 24 hours of high fluence-rate light treatment.

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Selected References

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