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      Light acclimation of shade-tolerant and light-resistant Tradescantia species: induction of chlorophyll a fluorescence and P700 photooxidation, expression of PsbS and Lhcb1 proteins.

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          Abstract

          In this work, we have compared photosynthetic performance and expression of the PsbS and Lhcb1 proteins in two contrast ecotypes of Tradescantia species, T. fluminensis (shade-tolerant) and T. sillamontana (light-resistant), grown at two intensities of light: 50-125 μmol photons m(-2) s(-1) (low light, LL) and 875-1000 μmol photons m(-2) s(-1) (high light, HL). Using the EPR method for measuring the P700 content, we have found that LL-grown plants of both species have higher (by a factor of ≈1.7-1.8) contents of PSI per fresh weight unit as compared to HL-grown plants. Acclimation of plants to LL or HL irradiation also influences the Chl(a + b) level and expression of the PsbS and Lhcb1 proteins. Immunoblotting analysis showed that acclimation to HL stimulates (by a factor of ≈1.7-1.8) the level of PsbS related to the total number of P700 centers. In light-resistant species T. sillamontana, the ratio PsbS/P700 is about 2-times higher than in shade-tolerant species T. fluminensis grown under the same conditions. This should enhance the capacity of their leaves for protection against the light stress. In agreement with these observations, the capacity of leaves for NPQ induction was enhanced during plant acclimation to HL. Kinetic studies of P700 photooxidation and light-induced changes in the yield of Chl a fluorescence also revealed that the short-term regulation of electron transport processes in chloroplasts, which manifested themselves in the kinetics of [Formula: see text] induction and the rate of Chl a fluorescence quenching, occurred more rapidly in HL-grown plants than in LL-grown plants. Thus, both factors, enhanced expression of PsbS and more rapid response of the photosynthetic electron transport chain to dark-to-light transitions should increase the capacity of HL-grown plants for their resistance to rapid fluctuations of solar light.

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          Author and article information

          Journal
          Photosyn. Res.
          Photosynthesis research
          Springer Nature
          1573-5079
          0166-8595
          Dec 2016
          : 130
          : 1-3
          Affiliations
          [1 ] Faculty of Physics, Moscow State University, Moscow, 119991, Russia.
          [2 ] N.K. Koltsov Institute of Developmental Biology, Moscow, 119334, Russia.
          [3 ] Faculty of Physics, Moscow State University, Moscow, 119991, Russia. an_tikhonov@mail.ru.
          [4 ] N.M. Emanuel Institute of Biochemical Physics, Moscow, 119334, Russia. an_tikhonov@mail.ru.
          Article
          10.1007/s11120-016-0252-z
          10.1007/s11120-016-0252-z
          27037825
          d88e3392-43f2-4df2-8d67-38bf3754aa3f
          History

          Acclimation to low and high light,Chl fluorescence,EPR,Lhcb1,Photosynthesis,PsbS,Tradescantia

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