Differences between barley and maize revealed in limitations of photosystems I and II under high temperature and low air humidity
Eugene A. Lysenko
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Abstract
Non-photochemical quenching and limitations of the photosystem I and photosystem II activities were studied in C3-plant barley and C4-plant maize. Plants were exposed to prolonged heat stress under high and low air humidity. Both species decreased non-photochemical quenching at 37–42°C, which increased at 46°C. A decrease of photosystem II activity at 46°C in lower air humidity was achieved through different mechanisms. In barley, photosystem II was downregulated by the increase of non-photochemical quenching. In maize, photosystem II was downregulated by the increase of acceptor-side limitation. Analysis of transients also revealed differences between species. One second after a light induction, limitations flashes at the acceptor sides of both photosystems. Elevating the temperature decreased these flashes; acceptor-side limitations of both photosystems decreased proportional to each other. In maize, the size of flashes slightly diminished at 37°C and decreased more at 42–46°C. In barley, the size of flashes greatly decreased at 37°C and gradually returned to the control level under higher temperatures. Around photosystem II, the flash was quenched by a burst of non-photochemical quenching. In barley, the transient peaks of acceptor-side limitation and non-photochemical quenching were very similar at any temperature. This was not observed in maize.
Keywords: air humidity, barley, chlorophyll fluorescence, heat stress, limitations of photosystems, maize, non-photochemical quenching, P700 light absorption.
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