"On the determination of QB-non-reducing photosystem II centers from chlorophyll a fluorescence induction" . . "Tomek, Pavel" . "\u0160troch, Michal" . . "0" . . . "0"^^ . "Il\u00EDk, Petr" . . . "On the determination of QB-non-reducing photosystem II centers from chlorophyll a fluorescence induction"@en . "0"^^ . "0168-9452" . "Laz\u00E1r, Du\u0161an" . . "665-670" . "The relative height of the so called Fpl (plateau) appearing between the O and P steps in the initial chlorophyll a fluorescence rise (FR) under low exciting light, is frequently used for a determination of the relative amount of QB-non-reducing photosy stem II centers ([PSII-QB-non]rel). On the basis of theoretical approach it has been already suggested that the Fpl level can be influenced, among others, by the intensity of exciting light. In this contribution, we present a calculation of [PSII-QB-non ]rel from the FRs measured at different intensities of exciting light (2-115 umol photons m-2 s-1). We have found that the higher intensity of exciting light, the higher is the estimation of [PSII-QB-non]rel (8-45%); thus the numerical expression of [PS II-QB-non]rel using the Fpl level in the FR is not plausible. Our experimental results were also successfully simulated by a simple mathematical model."@en . "On the determination of QB-non-reducing photosystem II centers from chlorophyll a fluorescence induction" . "Nau\u0161, Jan" . "1"^^ . . . . . "RIV/61988987:17310/03:00000053!RIV/2004/MSM/173104/N" . "NL - Nizozemsko" . "4" . . "619437" . "5"^^ . . . "Plant Science" . "6"^^ . "P(LN00A141), Z(MSM 153100010)" . . . "[B28453F79F78]" . "chlorophyll a fluorescence induction; intensity of exciting light; mathematical simulation; PSII heterogeneity; QB-non-reducing PSII centers"@en . "On the determination of QB-non-reducing photosystem II centers from chlorophyll a fluorescence induction"@en . . "The relative height of the so called Fpl (plateau) appearing between the O and P steps in the initial chlorophyll a fluorescence rise (FR) under low exciting light, is frequently used for a determination of the relative amount of QB-non-reducing photosy stem II centers ([PSII-QB-non]rel). On the basis of theoretical approach it has been already suggested that the Fpl level can be influenced, among others, by the intensity of exciting light. In this contribution, we present a calculation of [PSII-QB-non ]rel from the FRs measured at different intensities of exciting light (2-115 umol photons m-2 s-1). We have found that the higher intensity of exciting light, the higher is the estimation of [PSII-QB-non]rel (8-45%); thus the numerical expression of [PS II-QB-non]rel using the Fpl level in the FR is not plausible. Our experimental results were also successfully simulated by a simple mathematical model." . "17310" . "RIV/61988987:17310/03:00000053" . . .