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The chlorophyll fluorescence quenching and changes of absorbance in pea chloroplasts

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Photosynthetica

Abstract

Chlorophyll (Chl) fluorescence quenching parameters were measured in dark-adapted pea leaves and chloroplasts with the purpose to find the conditions of high and low non-photochemical quenching, that would be stable during a prolonged irradiation. A PAM fluorometer was used for measuring induction curves in the range of actinic radiation of 3-35 W m-2, with an ordinary value of about 15 W m-2. The effects of various mediators, i.e., ascorbate, methyl viologen (MV), dithiothreitol (DTT) and nigericin, on the quenching process were tested. Simultaneously, the absorbance was measured during a 15-20 min period of irradiation and after the actinic radiation was turned off, i.e., in the recovery period. The pH values of chloroplast suspensions were 5.5, 6.5 and 8.0, the largest non-photochemical quenching was observed at pH of 6.5. The irradiation of chloroplasts led to an absorption decrease within the entire photosynthetically active range, attaining saturation when the fluorescence reached Fs level, and to an absorption increase during the recovery period. Absorbance changes at the maximum of red band were 10-20 %. A decrease in Chl concentration (10 %) after irradiation was found only at pH of 5.5, when the recovery time was the longest, i.e., about 60 min.

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  1. Institute of Soil Science and Photosynthesis, Pushchino, Moscow Region, 142292, Russia

    I.B. Ganago

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Ganago, I. The chlorophyll fluorescence quenching and changes of absorbance in pea chloroplasts. Photosynthetica 34, 281–291 (1998). https://doi.org/10.1023/A:1006852926489

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