Acclimation of Tomato Leaves to Changes in Light Intensity; Effects on the Function of the Thylakoid Membrane |
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Authors: | DAVIES, E. C. CHOW, W. S. LE FAY, J. M. JORDAN, B. R. |
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Abstract: | When young tomato plants grown in high light (400 µmolquanta m2s1 PAR) were transferred to low light(100 µmol quanta m2s1 PAR), non-cyclic electrontransport capacity was decreased and the rate of dark re-oxidationof Q, the first quinone electron acceptor of photosystemII, was decreased within 12 d. In contrast, the amountof coupling factor CF1, assayed by its ATPase activity, decreasedmore gradually over several days. The total chlorophyll contentper unit leaf area remained relatively constant, although thechlorophyll a/chlorophyll b ratio declined. When young tomato plants grown in low light were transferredto high light, the ATPase activity of isolated thylakoids increasedmarkedly within 1 d of transfer. This increase occurred morerapidly than changes in chlorophyll content per leaf area. Inaddition, in vivo chlorophyll fluorescence induction curvesindicate that forward electron transfer from Q occurredmore readily. The functional implications of these changes arediscussed. Key words: Tomato, leaves, light intensity, thylakoid membrane |
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