Abstract
Possible use of integral characteristics of slow stage of chlorophyll fluorescence induction (CFI) for monitoring of physiological state of plants in phytocenoses was studied in the leaves of wheat Triticum aestivum L. and radish Raphanus sativus var. radicula Pers., cv. Virovskii belyi, grown in artificial-light culture. Investigation concerned the behavior of Т0.5 (half-time of fluorescence intensity decrease from its peak to a steady-state level), Rfd (fluorescence decrease ratio also known as vitality index), parameter \({{{{\overline V }}_{{{\text{max}}}}}}\) (maximum possible average rate of induction transient), and \(\bar {\alpha }\) (average efficiency of PSA in the induction period) during leaf ontogenesis. Plant material was the discs cut from uniformly illuminated wheat leaves of different age from the top (sixth) storey of plants and the disks from the second (in the order of emergence) true leaves of radish at the age from 3 to 24 days. The plants were grown in controlled-climate chambers in hydroponic culture on claydite at irradiance of 100 W/m2 of photosynthetically active radiation (PAR). CFI curves were recorded using a single-beam unit. Values of parameter Т0.5 slightly changed during leaves’ ontogenesis up to the time of senescence (the age of 26 days). Relative changes in the values of CFI parameters (Δ rel., %) at the age from 2 to 24 days were 28% for \(\bar {\alpha }\) and 30% for Т0.5. For \({{{{\overline V }}_{{{\text{max}}}}}}\) and Rfd, the values were 67 and 70%, respectively. Upon more advanced ageing and comparison of parameters for 24- and 26-day-old leaves, more pronounced changes were observed for Т0.5 (by 37.6%) and \({{{{\overline V }}_{{{\text{max}}}}}}\) (by 36.0%) and less pronounced for \(\bar {\alpha }\) (by 23.0%) and Rfd (by 13.0%). Thus, the pattern of parameter Т0.5 behavior observed in the course of wheat leaves’ ontogenesis distinguished it from other fluorescence parameters of CFI slow stage (Rfd, \(\bar {\alpha }\), and \({{{{\overline V }}_{{{\text{max}}}}}}\)); this gives grounds for a potential use of Т0.5 as one of the simplest integral indicators of physiological state and pathophysiological (irreversible) changes occurring in plant leaves within a wide age interval and upon senescence. Unambiguous interpretation of the data obtained by means of parameter Т0.5 under stress conditions for estimation of irreversibility of the observed changes in PSA requires more detailed investigations.
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Translated by N. Balakshina
Abbreviations: IDA—irradiation density of adaptation; CFI—chlorophyll fluorescence induction; PAR—photosynthetically active radiation; PSA—photosynthetic apparatus.
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Nesterenko, T.V., Tikhomirov, A.A. & Shikhov, V.N. Physiological (Integral) Approach to the Use of Chlorophyll Fluorescence Parameters of Plant Leaves. Russ J Plant Physiol 69, 53 (2022). https://doi.org/10.1134/S1021443722030116
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DOI: https://doi.org/10.1134/S1021443722030116