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

作者：Ptushenko V V^*; Ptushenko O S; Samoilova O P; Solovchenko A E

来源：Biochemistry-Moscow, 2017, 82(1): 67-74.

DOI：10.1134/S0006297917010072

• Tradescantia
• excessive light stress
• leaf optical transparence
• chlorophyll fluorescence

The kinetics of irradiation-induced changes in leaf optical transparence (Delta T) 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 Delta T in these species were 12 and 20 min, respectively. The Delta T was not confirmed to be the main contributor to the observed middle phase of NPQ relaxation kinetics (tau = 10-28 min). Comparison of rate of photoinduced increase in Delta T 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 mu mol PAR center dot m(-2)center dot s(-1). Irradiance tolerance correlated with the rate of "apparent NPQ" induction. Considering that the induction of apparent NPQ involves processes significantly faster than Delta T, 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).

• 出版日期2017-1