Photosynthesis inhibition by exogenously generated singlet oxygen - a note of caution

Hideg, Éva: Photosynthesis inhibition by exogenously generated singlet oxygen - a note of caution. In: Acta biologica Szegediensis, (52) 1. pp. 85-88. (2008)

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Two commonly applied exogenous singlet oxygen sensitizers, rose bengal (RB) and methylene blue (MB) were studied in terms of toxicity and photodynamic efficacy in green leaves. Their effects on photosynthesis with and without the singlet oxygen generating illumination were measured as changes in Photosystem II photochemical yield. Although the two photosensitizers caused the same, concentration-dependent weak inhibition in the dark, RB was more efficient to promote photodynamic injury to Nicotiana tabacum leaves in the presence of visible light. Results show that RB is more advantageous for leaf studies than MB. RB, however, should be used in moderation, as it may cause an additional, singlet oxygen independent inhibition of photosynthesis when applied at high concentrations. The application limit was about 2mM using youngest fully expanded leaves of 4-week-old, green-house grown tobacco plants.

Item Type: Article
Heading title: Proceedings
Journal or Publication Title: Acta biologica Szegediensis
Date: 2008
Volume: 52
Number: 1
ISSN: 1588-385X
Page Range: pp. 85-88
Language: angol
Event Title: Hungarian Congress on Plant Biology, 9., 2008, Szeged
Uncontrolled Keywords: Természettudomány, Biológia
Additional Information: Bibliogr.: 88. p.; Abstract
Date Deposited: 2016. Oct. 17. 09:24
Last Modified: 2018. May. 25. 14:07

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