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 (30min) 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 (0.5–1h), 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. Key words: Phaseolus vulgaris, chlorophyll fluorescence, heat acclimation, photosynthesis (photosystem 2). *Corresponding authorThermal acclimation of the photosynthetic apparatus 13
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Claims 8
Claim · model-written summary
Exposure of bean plants for 5 hours to high temperatures increased thermal tolerance of the photosynthetic apparatus by 2-3°C.
- Taxon
- bean plantse1
- Treatment
- Exposure of the plants for 5 hours to high temperaturese2
- Outcome
- thermal tolerance of the photosynthetic apparatuse2
- Direction
- increasee2
- Value
- 2–3°Ce2
Not reportedComparator
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e2“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”
Claim · model-written summary
The acclimation effect on thermal tolerance was most obvious in bean plants exposed to 45°C for 5 hours.
- Taxon
- bean plantse1
- Treatment
- 45°C for 5 hourse3
- Outcome
- thermal tolerance of their photosynthetic apparatuse1
- Direction
- increaseinferrede3
- Qualifier
- most obviouse3
Not reportedComparator
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e3“This effect was most obvious in plants exposed at 45°C for 5 hours”
Claim · model-written summary
Additional stress caused further development of plant resistance in bean plants.
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e4“Additional stress caused further development of plant resistance”
Claim · model-written summary
Maximal stability of the photosynthetic apparatus was achieved at sublethal temperatures in bean plants.
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e5“maximal stability was achieved at sublethal temperatures”
Claim · model-written summary
A very short treatment of 30 min led to well-expressed acclimation in bean plants that allowed them to endure additional stress.
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e6“It was found that even a very short treatment (30min) led to well-expressed acclimation allowing the plants to endure additional stress”
Claim · model-written summary
Thermal stability of variable fluorescence was unchanged in bean plants after short-term acclimation of 0.5-1 h.
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e7“Thermal stability (T 50) of variable fluorescence (F v/F m) was unchanged at short-term acclimation (0.5–1h)”
Claim · model-written summary
Thermal stability (T 50) of bean plants rose from 45°C up to 48°C after 8 h of hardening.
- Taxon
- bean plantse1
- Treatment
- 8 h hardeninge3
- Outcome
- Thermal stability (T 50)e7
- Direction
- rosee3
- Value
- 45°C up to 48°Ce3
Not reportedComparator
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e7“Thermal stability (T 50) of variable fluorescence (F v/F m) was unchanged at short-term acclimation (0.5–1h)”
e3“but it rose from 45°C up to 48°C after 8 h hardening”
Claim · model-written summary
The acclimation effect is assumed to act mainly at the cellular level rather than at primary photosynthetic reactions in bean plants.
Verbatim
e1“The ability of young bean plants to increase the thermal tolerance of their photosynthetic apparatus”
e2“It was assumed that acclimation effect is realized primarily not on the level of primary photosynthetic reactions, but on the cellular level”
The same questions in other papers
heat · physiology: photosynthesis · Phaseolus vulgaris (common bean)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- no effect
3 papers more in this group
See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.