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Spectral and functional properties of chloroplasts in pine seedlings grown in the light and in darkness

, : Spectral and functional properties of chloroplasts in pine seedlings grown in the light and in darkness. Fiziologiya Rastenii (Moscow) 34(3): 445-452

The content of chlorophyll, the number of reaction centers and the functional activity of oxygen evolution were estimated in pine seedlings grown in darkness and after plant exposure to light. In the seedlings grown in darkness, as compared to light-grown plants, the amount of chlorophyll a and b, expecially that of their longwave forms, and the number of action centers were reduced four times. The value of variable fluorescence in darkgrown plants was not activated by light which indicated that the complete formation of reaction centers, with manganese atoms included, occurred in darkness. The chloroplasts isolated from dark-grown seedlings were able to evolve O2 just at the first flashes, but their capacity for characteristic oscillations with the periodicity of the number of flashes being a multiple of four appeared only after 60 flashes. The rate of O2 evolution by dark-grown seedlings after light activation was 25% of that in the seedlings grown under continuous light and 5.5% of that in plants grown under pulsed light. The results confirm the fundamental principle of the photoactivation of latent water-oxidizing complex in green plants.

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