Influence of excitation light intensity and leaf age on the slow chlorophyll fluorescence transient in radish |
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Authors: | T V Nesterenko A A Tikhomirov V N Shikhov |
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Institution: | 1. Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia
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Abstract: | The temporal characteristics of the slow phase of chlorophyll fluorescence induction-T 0.5 (half-decay time) and t min (an integral-based index of the variable emission rate)-as well as the popular amplitude index F P/F S were determined at different excitation light intensities (I ex 400?C500 nm] of 20?C80 W/m2) in dark-adapted leaves of different age (3?C24 days) taken from radish plants grown under continuous light of 100 W/m2 PAR. All the profiles thus obtained were mutually consistent, and the age-related variations were minimized at I ex > 40 W/m2; at that the age-averaged temporal indices proved to be more light-responsive than the standard amplitude ratio. |
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