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The response of Photosystem II (PS II) activity to water deficit, as characterized by measurements of chlorophyll (Chi) a fluorescence, greatly differs among plant species. Only cyanobacteria and lower plants are capable of rapid restoration of the PS II photochemical capacity following their rewetting after strong inhibition due to severe desiccation. In lower plants kept in light and in the air-dried...
Photochemical efficiencies of photosystemI (PSI) and photosystemII (PSII) were studied in dry thalli of the lichen Hypogymnia physodes and during their re-hydration. In dry thalli, PSII reaction centers are photochemically inactive, as evidenced by the absence of variable chlorophyll (Chl) fluorescence, whereas the primary electron donor of PSI, P700, exhibits irreversible oxidation under continuous...
The changes in electron transport within photosystemI (PSI) were studied in detached leaves of Cucumis sativus L. during the course of irradiation with moderate white light (300molphotonsm2s1) at 4C. When intact leaves were exposed to the combination of moderate light and low temperature, the amplitude of far-red light-induced P700 absorbance changes at 820nm (��A820), a relative measure of PSI, progressively...
The relationship between the redox state of P700, the primary donor of PS I, monitored using absorbance changes at 830 nm and photochemical energy storage in PS I reaction centers assayed with the photoacoustic method (PA) was studied in isolated PS I submembrane particles aspirated onto nitrocellulose filters. Several donors have been used to support the electron transport through PS I. NADPH and...
In illuminated intact spinach chloroplasts, warming to and beyond 40 °C increased the proton permeability of thylakoids before linear electron transport through Photosystem II was inhibited. Simultaneously, antimycin A-sensitive cyclic electron transport around Photosystem II was activated with oxygen or CO2, but not with nitrite as electron acceptors. Between 40 to 42 °C, activation of cyclic electron...
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