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Heat sensitivity of chloroplasts and leaves: Leakage of protons from thylakoids and reversible activation of cyclic electron transport
In illuminated intact spinach chloroplasts, warming to and beyond 40 °C increased the proton permeability of thylakoids before linear electron transport through Photosystem II was inhibited.…
Alternative Photosystem I-Driven Electron Transport Routes: Mechanisms and Functions
The energetic and regulatory functions of PS I-driven pathways must be an integral part of photosynthetic organisms and provides additional flexibility to environmental stress.
Energy dissipation in photosynthesis: Does the quenching of chlorophyll fluorescence originate from antenna complexes of photosystem II or from the reaction center?
A mathematical model explaining fluorescence was developed, suggesting antenna quenching as the predominant mechanism of dissipation of light energy in the moss Rhytidiadelphus, whereas reaction-center quenched appeared to be important in spinach and Arabidopsis.
Analysis of chlorophyll a fluoresence changes in weak light in heat treated Amaranthus chloroplasts
The experiments indicate that the heat induced rise of fluorescence level at low light can not be due to changes in the elevation in the true constant F0 level, but largely associated with the shift in the redox state of QA, the primary stable electron acceptor of photosystem II.
Photosystem II inhibition by moderate light under low temperature in intact leaves of chilling-sensitive and -tolerant plants.
- Sridharan Govindachary, N. Bukhov, D. Joly, R. Carpentier
- Biology, MedicinePhysiologia plantarum
- 1 June 2004
Findings imply that the process of chilling-induced photoinhibition involves damage to more than one site in the PSII complexes, and indicates a stronger PSII inhibition in cucumber, maize and tomato plants.
Electron flow to photosystem I from stromal reductants in vivo: the size of the pool of stromal reductants controls the rate of electron donation to both rapidly and slowly reducing photosystem I…
Electron donation from stromal reductants to photosystem I (PSI) was studied using the kinetics of P700+ reduction in the dark after irradiation of barley leaves, providing strong additional evidence in favor of two distinct types of PSI existing per se in barley leaves.
Nonphotosynthetic Reduction of the Intersystem Electron Transport Chain of Chloroplasts Following Heat Stress. Steady-state Rate
Abstract The consequence of elevated temperatures in the range of 39–51°C on the steady-state rate of light-induced electron transport through photosystem I (PSI) supported by stromal reductants was…
Effect of drought on chlorophyll content and antioxidant enzyme activities in leaves of three wheat cultivars varying in productivity
- M. Nikolaeva, S. N. Maevskaya, A. Shugaev, N. Bukhov
- BiologyRussian Journal of Plant Physiology
- 12 January 2010
Different responses of the defense systems were mobilized to implement plant protection against water stress, indicating that the antioxidant enzyme defense system was weakened and lipid peroxidation enhanced in wheat cultivars.
Protection of the photosynthetic apparatus against damage by excessive illumination in homoiohydric leaves and poikilohydric mosses and lichens.
- U. Heber, N. Bukhov, V. Shuvalov, Y. Kobayashi, O. Lange
- Medicine, BiologyJournal of experimental botany
- 1 October 2001
Experimental work on the control of photosystem II in the photosynthetic apparatus of higher plants, mosses and lichens is reviewed on a background of current literature, and loss of chlorophyll fluorescence during the drying of predarkened poikilohydric mossesand lichens indicates energy dissipation in the dry state which is unrelated to protonation and zeaxanthin availability.
Control of energy dissipation and photochemical activity in photosystem I by NADP-dependent reversible conformational changes.
- S. Rajagopal, N. Bukhov, H. Tajmir-Riahi, R. Carpentier
- Chemistry, MedicineBiochemistry
- 14 October 2003
A new control mechanism of energy dissipation and photochemical activity by NADP(+)/NADPH is proposed to increase the turnover rate of PSI under conditions when both linear and cyclic electron transport activities must be supported.