Effects of light environment on the induction of chlorophyll fluorescence in leaves: a comparative study of Tradescantia species of different ecotypes |
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Authors: | Samoilova O P Ptushenko V V Kuvykin I V Kiselev S A Ptushenko O S Tikhonov A N |
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Institution: | a Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia b Institute of Physical-Chemical Biology, Moscow State University, Moscow, Russia c Department of Biophysics, Faculty of Physics, Moscow State University, Moscow, Russia d Main Botanical Gardens, Russian Academy of Sciences, Moscow, Russia e Faculty of Biology and Chemistry, Moscow State Pedagogical University, Moscow, Russia |
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Abstract: | In this work, using a PAM-fluorimetry technique, we have compared effects of plant adaptation to the light or dark conditions on the kinetics of chlorophyll a fluorescence yield in Tradecantia leaves of several species (Tradescantia albiflora, Tradescantia fluminensis, Tradescantia navicularis, and Tradescantia sillamontana), which represent plants of different ecotypes. Two fluorescence parameters were used to assess photosynthetic performance in vivo: non-photochemical quenching (NPQ) of chlorophyll fluorescence (qNPQ) determined by energy losses in the light-harvesting antenna of photosystem 2 (PS2), and PS2 operating efficiency (ΦPSII). Comparative study of light-induced changes in qNPQ and ΦPSII has demonstrated that shade-tolerant Tradecantia species (T. albiflora Kunth, T. fluminensis Vell.) reveal higher capacities for NPQ and demonstrate slower transitions between the ‘light-adapted’ and ‘dark-adapted’ states than succulent species T. navicularis and T. sillamontana, which are typical habitats of semi-deserts. We analyze the photosynthetic performance of Tradescantia species in the context of their adaptabilities to variable environment conditions. The ability of shade-tolerant plants to retain a relatively long-term (∼40-60 min) ‘memory’ for illumination history may be associated with the regulatory mechanisms that provide the flexibility of photosynthetic apparatus in response to fluctuations of light intensity. |
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Keywords: | PS1 and PS2 photosystem 1 and photosystem 2 respectively P700 primary electron donor of PS1 P680 primary electron donor of PS2 ATP adenosine triphosphate ADP adenosine diphosphate Pi inorganic phosphate BBC Bassham-Benson-Calvin cycle b6f plastoquinone-plastocyanin-oxidoreductase (b6f -complex) LEF linear electron flux NPQ non-photochemical quenching LHCII light-harvesting complex II PAM pulse amplitude modulation |
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