Electron transport activities of chloroplasts isolated from the detached rice leaves stored under low temperature with illumination
1988
Moon, B.Y. | Kwon, Y.M. (Seoul National Univ., Seoul (Korea R.). Dept. of Botany) | Park, M.C. (Songsim Coll. for Women, Bucheon (Korea R.). Dept. of Biology)
The electron transport activities of chloroplasts isolated from the detached rice (Oryza sativa L. cv. Chucheong) leaves stored under low temperature (4deg C) with light illumination were investigated to understand the role of light in the low temperature inhibition of photosynthesis in the chilling-sensitive plant. Chlorophyll content of the detached leaves upon incubation at 28deg C and 4deg C in the dark was also measured. The rice seedlings were grown with Hoagland medium in the growth chamber of 28deg C temperature and 400 ft.c fluorescent light with the photoperiod of 16h. Although chlorophyll content of the detached leaves stored in the dark declined by 61.7 % after 28deg C treatment, there occurred only 5.2 % decrease of chlorophyll with 4deg C treatment. Low temperature treatment (4deg C) for 6 days brought about decreases in total photosystem (PS2 + PS1) activities by 35.2 % and 73.6 % in the presence and absence of light, respectively, while after 28deg C treatment of the detached leaves for 6 days in the dark there was only 27.6 % decrease in PS2 + PS1 activity. PS2 activities also decreased by 35.6 % and 72.2 % in the light and dark, respectively. Investigations into DPC - DCPIP and NH2OH - DCPIP activities revealed that low temperature inhibition of PS 2 activities was not due to the inactivation of the water oxidation capacity at low temperature. It was concluded that light protects the electron transport activities of isolated rice chloroplasts from the inhibitory effect of low temperature in the detached leaves
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