Assessing the photoprotective effectiveness of non-photochemical chlorophyll fluorescence quenching: A new approach
نویسندگان
چکیده
منابع مشابه
Modulation of Millisecond Chlorophyll Luminescence by Non-Photochemical Fluorescence Quenching
By combining a high frequency modulation system for measurement of fluorescence with a phosphoroscope type apparatus for measurement of luminescence, recordings of fluorescence and luminescence induction kinetics under identical conditions were obtained. Both measuring sys tems tolerated the application of saturating pulses of white light for rapid, transient elimination of photochemical quenc...
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Chlorophyll fluorescence quenching induced by H 20 2 in intact spinach chloroplasts was investi gated with a modulation fluorometer which allows to distinguish between photochemical and non photochemical quenching com ponents by the so-called saturation pulse method. Residual catalase activity was removed by washing and percoll gradient centrifugation. H 20 2 was found to induce pronounced ph...
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Diatoms are especially important microorganisms because they constitute the larger group of microalgae. To survive the constant variations of the light environment, diatoms have developed mechanisms aiming at the dissipation of excess energy, such as the xanthophyll cycle and the non-photochemical chlorophyll (Chl) fluorescence quenching. This contribution is dedicated to the relaxation of the ...
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NPQ (non-photochemical quenching) is a fundamental photosynthetic mechanism by which plants protect themselves against excess excitation energy and the resulting photodamage. A discussed molecular mechanism of the so-called feedback de-excitation component (qE) of NPQ involves the formation of a quenching complex. Recently, we have studied the influence of formation of a zeaxanthin-chlorophyll ...
متن کاملIn diatoms, the transthylakoid proton gradient regulates the photoprotective non-photochemical fluorescence quenching beyond its control on the xanthophyll cycle.
In diatoms, the non-photochemical fluorescence quenching (NPQ) regulates photosynthesis during light fluctuations. NPQ is associated with an enzymatic xanthophyll cycle (XC) which is controlled by the light-driven transthylakoid proton gradient (delta pH). In this report, special illumination conditions and chemicals were used to perturb the kinetics of the delta pH build-up, of the XC and of N...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 2012
ISSN: 0005-2728
DOI: 10.1016/j.bbabio.2012.03.026