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- W2099693780 abstract "Summary. The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus after treatment with different high temperatures or at fixed temperature with different duration was studied. Parameters of chlorophyll fluorescence induction kinetics were used as a criterion to evaluate the photosynthetic activity of primary leaves. The thermosensitivity of photosynthesis was estimated immediately after the acclimation procedure, as well as after additional stress treatment at 55°C for 5 hours. Exposure of the plants for 5 hours to high temperatures (38, 43, 45 or 47.5°C) led to a marked increase (2–3 °C) in thermal tolerance of the photosynthetic apparatus. This effect was most obvious in plants exposed at 45°C for 5 hours. Additional stress caused further development of plant resistance. It was shown that under the experimental conditions used, maximal stability was achieved at sublethal temperatures. The dynamics of temperature acclimation was followed by changes in thermosensitivity of fluorescence parameters after 0.5, 1, 2, 4, and 8 hour’s exposure of the plants at 45°C. It was found that even a very short treatment (30 min) led to well-expressed acclimation allowing the plants to endure additional stress. Thermal stability (T 50 ) of variable fluorescence (F v /F m ) was unchanged at short-term acclimation (0.5–1 h), but it rose from 45°C up to 48°C after 8 h hardening. It was assumed that acclimation effect is realized primarily not on the level of primary photosynthetic reactions, but on the cellular level." @default.
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- W2099693780 date "1995-01-01" @default.
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- W2099693780 title "THERMAL ACCLIMATION OF THE PHOTOSYNTHETIC APPARATUS DEPENDING ON TEMPERATURE AND DURATION OF TREATMENT" @default.
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