Analysis of photoprotection and apparent non-photochemical quenching of chlorophyll fluorescence in Tradescantia leaves based on the rate of irradiance-induced changes in optical transparence
- Autores: Ptushenko V.1,2, Ptushenko O.3, Samoilova O.2, Solovchenko A.4,5
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Afiliações:
- Belozersky Institute of Physico-Chemical Biology
- Emanuel Institute of Biochemical Physics
- Moscow Secondary School 261
- Faculty of Biology
- Timiryazev Institute of Plant Physiology
- Edição: Volume 82, Nº 1 (2017)
- Páginas: 67-74
- Seção: Article
- URL: https://journals.rcsi.science/0006-2979/article/view/151223
- DOI: https://doi.org/10.1134/S0006297917010072
- ID: 151223
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Resumo
The kinetics of irradiation-induced changes in leaf optical transparence (ΔT) and non-photochemical quenching (NPQ) of chlorophyll fluorescence in Tradescantia fluminensis and T. sillamontana leaves adapted to different irradiance in nature was analyzed. Characteristic times of a photoinduced increase and a dark decline of ΔT in these species were 12 and 20 min, respectively. The ΔT was not confirmed to be the main contributor to the observed middle phase of NPQ relaxation kinetics (τ = 10-28 min). Comparison of rate of photoinduced increase in ΔT and photosystem II quantum yield recovery showed that the former did not affect the tolerance of the photosynthetic apparatus (PSA) to irradiances up to 150 μmol PAR·m–2·s–1. Irradiance tolerance correlated with the rate of “apparent NPQ” induction. Considering that the induction of apparent NPQ involves processes significantly faster than ΔT, we suggest that the photoprotective mechanism induction rate is crucial for tolerance of the PSA to moderate irradiance during the initial stage of light acclimation (first several minutes upon the onset of illumination).
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Sobre autores
V. Ptushenko
Belozersky Institute of Physico-Chemical Biology; Emanuel Institute of Biochemical Physics
Autor responsável pela correspondência
Email: ptush@belozersky.msu.su
Rússia, Moscow, 119234; Moscow, 119334
O. Ptushenko
Moscow Secondary School 261
Email: ptush@belozersky.msu.su
Rússia, Moscow, 121108
O. Samoilova
Emanuel Institute of Biochemical Physics
Email: ptush@belozersky.msu.su
Rússia, Moscow, 119334
A. Solovchenko
Faculty of Biology; Timiryazev Institute of Plant Physiology
Email: ptush@belozersky.msu.su
Rússia, Moscow, 119991; Moscow, 127276