Effect of Water Stress on Photochemical Activity of Chloroplasts during Greening of Etiolated Barley Seedlings

概要

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Water stress retards accumulation of chlorophyll and chlorophyll a/b protein complex during greening of barley seedlings in light. The rate of 2,6-dichlorophenol indophenol (DCPIP) photoreduction in isolated chloroplast which decreases under water stress is enhanced significantly in the presence of electron donors, diphenyl carbazide (DPC) and Mn^2+. Under water stress, the decrease of the rate of oxygen evolution measured in continuous white light was 40-73% and that of oxygen uptake (as a measure of electron transport through PS I from reduced DCPIP) was only about 20% During greening, under water stress, (i) a differential inhibition of PS II biosynthesis as compared to PS I occurs, (ii) the site of electron donation by DPC seems to be closer to the reaction center of PS II, (iii) the oxidizing side of PS II near the oxygen-evolving system is affected maximally by water stress.
日本植物生理学会の論文