Singlet oxygen production in photosynthesis

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Singlet oxygen production in photosynthesis.

A photosynthetic organism is subjected to photo-oxidative stress when more light energy is absorbed than is used in photosynthesis. In the light, highly reactive singlet oxygen can be produced via triplet chlorophyll formation in the reaction centre of photosystem II and in the antenna system. In the antenna, triplet chlorophyll is produced directly by excited singlet chlorophyll, while in the ...

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In oxygenic photosynthesis, a highly oxidising chlorophyll species strips electrons out of two water molecules, generating molecular oxygen as a waste product. A recent study has provided new insights into the structure of the molecular machinery responsible for biological oxygen production.

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Singlet Oxygen Production Photosensitized by Fluorescein in Reversed Micellar Solutions

The quantum yield of singlet oxygen production was investigated in dodecylammonium propionate reversed micellar solutions containing 1,3-diphenylisobenzofuran and fluorescein as photosensitizer. The quantum yield was highly enhanced by the binding of fluorescein to reversed micelles, and increased with decreasing the solubilized water content in reversed micelles. Results obtained was discussed...

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Singlet oxygen production in Chlamydomonas reinhardtii under heat stress

In the current study, singlet oxygen formation by lipid peroxidation induced by heat stress (40 °C) was studied in vivo in unicellular green alga Chlamydomonas reinhardtii. Primary and secondary oxidation products of lipid peroxidation, hydroperoxide and malondialdehyde, were generated under heat stress as detected using swallow-tailed perylene derivative fluorescence monitored by confocal lase...

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Singlet Oxygen

Singlet oxygen (O2) is a higher energy state molecular oxygen species. It is one of the most active intermediates involved in chemical and biochemical reactions. To fully appreciate the reactivity of O2, it is necessary to understand its physical and chemical nature. This paper reviews the generation, quenching and detection of O2. Its properties, possible chemical reactions are presented as we...

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ژورنال

عنوان ژورنال: Journal of Experimental Botany

سال: 2004

ISSN: 1460-2431

DOI: 10.1093/jxb/erh237