Influence of elevated temperature on electron flows in chloroplasts of barley

Abstract

The efficiency of electron carriers in thylakoid membranes untreated and exposed to heat 7-day-old barley seedlings was evaluated with PAM fluorescence. Darkness–light transitional states in chloroplasts after heat exposure are studied. Thermoinduced changes in linear and cyclic electron transport chain of chloroplasts are revealed. The activation of NADPH-dependent electron flux after exposure to elevated temperatures is shown. We assumed that ΔрН of thylakoid membranes employed the regulatory role in the distribution of electron flows and the adaptation of the photosynthetic apparatus to stressful effects.

Cultivar differences in the operation of the photosystem II of barley leaves

“…In recent years, the measurement of Chl a fluorescence, in particular the JIP test has become a popular method for assessing the stability of photosynthesis under the influence of various stress factors of both abiotic and biotic nature [3]. For example, the change in the parameters of rapid fluorescence of barley leaves under the influence of drought has been studied in [4,5]; under the influence of high temperature -in [6], under the influence of salinity -in [7]. The effect of heavy metal ions on the action of barley PSII was studied by [8]; the level of chlorophyll fluorescence correlated with the barley lodging resistance index in [9].…”