Effect of various chemical agents on photosynthesis studied by the method of fluorescence induction

Karavaev, V. A.; Polyakova, I. B.; Solntsev, M. K.; Yurina, T. P.

doi:10.1016/s0022-2313(97)00299-8

Cited by 19 publications

(3 citation statements)

References 3 publications

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“…In general, this decrease is caused by photochemical quenching (partial oxidation of the primary electron acceptors in PS II under low light illumination), and the nonphotochemical one (redistribution of excitation energy from PS II to PS I; generation of the proton gradient, ∆pH, across the thylakoid membrane; and non-radiative energy dissipation under high light illumination) (KRAUSE & WEISS 1991;LAZAR 1999). Earlier, we showed that the relative fluorescence decay, ratio (F M -F T )/F T , was correlated with the photosynthetic activity (KARAVAEV et al 1998). The treatment of plants with BION caused the increase in (F M -F T )/F T ratio (Table 1) due to the enhancement of the F M values (Figure 2).…”

Section: Resultsmentioning

confidence: 73%

Stimulant effect of plant activator BION on photosynthesis and its inhibitory effect on pathogenic fungi

Solntsev¹,

Karavaev²,

Yurina³

et al. 2002

Plant Prot. Sci.

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Spraying of wheat seedlings with aqueous preparations of CGA 245704 (BION) caused a slight decrease in chlorophyll content accompanied by the stable increase in the rate of O<sub>2</sub> evolution per chlorophyll. Stimulant effect of BION on photosynthetic activity depended on both the ai concentration and number of treatments. Biophysical methods based on the registration of slow fluorescence induction and thermoluminescence of wheat leaves revealed the stimulation of photosystem II activity and the increase in the rate of electron transport between the photosystems in treated plants. It is also shown that BION itself can show a partial fungitoxic activity because it slowed down the germination of Erysiphe graminis f.sp. tritici fungi. This is obviously the reason for partial protective effect of BION when it was applied after the inoculation of wheat seedlings with the pathogen.

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Section: Resultsmentioning

confidence: 73%

Stimulant effect of plant activator BION on photosynthesis and its inhibitory effect on pathogenic fungi

Solntsev¹,

Karavaev²,

Yurina³

et al. 2002

Plant Prot. Sci.

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“…Two weeks after treatment, the height of the plants was also reduced (table 1). Previously, such changes in slow fluorescence induction were observed in the case of plant treated with an electron transport inhibitor diuron 14 . In this case, the inhibitory effect of epin on photosynthesis immediately after treatment can be explained by the stressful conditions (drought) in which the plants were found.…”

Section: Experiments With Barley Plantsmentioning

confidence: 79%

“…It is supposed that this decrease is caused by some regulatory processes directed to the achievement of the optimal functioning of the light and dark stages of photosynthesis 1 . In our previous works [13][14][15] , we have established that the relative changes in (FM−FT)/FT ratio correspond to the relative changes in photosynthetic activity estimated as a rate of O2 evolution per chlorophyll.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent indices of barley and tagetes plants treated with physiologically active compounds

Kalmatskaya,

Malozemova,

Karavaev

et al. 2023

XVI International Conference on Pulsed Lasers and Laser Applications

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Fluorescence induction in the phycobilisome-containing cyanobacterium Synechococcus sp PCC 7942: Analysis of the slow fluorescence transient

Stamatakis

Tsimilli‐Michael²,

Papageorgiou

2007

Biochimica et Biophysica Acta (BBA) - Bioenergetics

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At room temperature, the chlorophyll (Chl) a fluorescence induction (FI) kinetics of plants, algae and cyanobacteria go through two maxima, P at approximately 0.2-1 and M at approximately 100-500 s, with a minimum S at approximately 2-10 s in between. Thus, the whole FI kinetic pattern comprises a fast OPS transient (with O denoting origin) and a slower SMT transient (with T denoting terminal state). Here, we examined the phenomenology and the etiology of the SMT transient of the phycobilisome (PBS)-containing cyanobacterium Synechococcus sp PCC 7942 by modifying PBS-->Photosystem (PS) II excitation transfer indirectly, either by blocking or by maximizing the PBS-->PS I excitation transfer. Blocking the PBS-->PS I excitation transfer route with N-ethyl-maleimide [NEM; A. N. Glazer, Y. Gindt, C. F. Chan, and K.Sauer, Photosynth. Research 40 (1994) 167-173] increases both the PBS excitation share of PS II and Chl a fluorescence. Maximizing it, on the other hand, by suspending cyanobacterial cells in hyper-osmotic media [G. C. Papageorgiou, A. Alygizaki-Zorba, Biochim. Biophys. Acta 1335 (1997) 1-4] diminishes both the PBS excitation share of PS II and Chl a fluorescence. Here, we show for the first time that, in either case, the slow SMT transient of FI disappears and is replaced by continuous P-->T fluorescence decay, reminiscent of the typical P-->T fluorescence decay of higher plants and algae. A similar P-->T decay was also displayed by DCMU-treated Synechococcus cells at 2 degrees C. To interpret this phenomenology, we assume that after dark adaptation cyanobacteria exist in a low fluorescence state (state 2) and transit to a high fluorescence state (state 1) when, upon light acclimation, PS I is forced to run faster than PS II. In these organisms, a state 2-->1 fluorescence increase plus electron transport-dependent dequenching processes dominate the SM rise and maximal fluorescence output is at M which lies above the P maximum of the fast FI transient. In contrast, dark-adapted plants and algae exist in state 1 and upon illumination they display an extended P-->T decay that sometimes is interrupted by a shallow SMT transient, with M below P. This decay is dominated by a state 1-->2 fluorescence lowering, as well as by electron transport-dependent quenching processes. When the regulation of the PBS-->PS I electronic excitation transfer is eliminated (as for example in hyper-osmotic suspensions, after NEM treatment and at low temperature), the FI pattern of Synechococcus becomes plant-like.

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Effect of various chemical agents on photosynthesis studied by the method of fluorescence induction

Cited by 19 publications

References 3 publications

Stimulant effect of plant activator BION on photosynthesis and its inhibitory effect on pathogenic fungi

Stimulant effect of plant activator BION on photosynthesis and its inhibitory effect on pathogenic fungi

Fluorescent indices of barley and tagetes plants treated with physiologically active compounds

Fluorescence induction in the phycobilisome-containing cyanobacterium Synechococcus sp PCC 7942: Analysis of the slow fluorescence transient

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