Abstract
Treatment of plants by phytohormones is a perspective method of regulation of the plant stress resistance and productivity. However, the mechanisms of phytohormone effects on physiological processes require investigations. The aim of this work was the analysis of the influence of exogenous abscisic acid (ABA) on photosynthesis in seedlings of pea and wheat, and in particular, an estimation of the involvement of the mesophyll conductance to CO2 in the realization of the ABA effects. A standard system for recording of photosynthetic parameters and a system for intracellular measurements of electrical activity were used in the experiments. It was shown that the effect of exogenous ABA on photosynthesis was most prominent 1 day after spraying of a plant. A detailed analysis of photosynthetic processes showed that ABA decreased photosynthetic assimilation of CO2 and increased cyclic electron flow in plants under study; these processes were interconnected. A decrease of the mesophyll conductance to CO2 was probably a mechanism of the decrease in the photosynthetic assimilation of CO2, because ABA did not significantly influence water conductance of a leaf and parameters of the CO2 fixation in Calvin–Benson cycle. It is likely that the decrease of the mesophyll conductance to CO2 was related with a decrease of the plasma membrane conductance to carbon dioxide. Inactivation of H+-ATP-ase and changes in extracellular pH can be a mechanism of this decrease. A decrease of the metabolic component of the electrical resting potential after the ABA treatment testifies in favor of this possibility.
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Claims 11
Claim · model-written summary
The effect of exogenous ABA on photosynthesis was most prominent one day after spraying.
- Taxon
- pea and wheat
Lathyrus oleraceus
Triticum aestivumt0 - Treatment
- exogenous ABAe0
- Outcome
- effect of exogenous ABA on photosynthesise0
- Value
- 1 daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of exogenous ABA on photosynthesis was most prominent 1 day after spraying of a plant”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
ABA decreased photosynthetic CO2 assimilation in pea and wheat.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- ABAe0
- Outcome
- photosynthetic assimilation of CO2e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA decreased photosynthetic assimilation of CO2”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
ABA increased cyclic electron flow in pea and wheat.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- ABAt1
- Outcome
- cyclic electron flowe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased cyclic electron flow in plants under study”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
ABA-associated decreases in CO2 assimilation and increases in cyclic electron flow were interconnected.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- ABAt1
- Outcome
- these processes were interconnectede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these processes were interconnected”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
ABA decreased mesophyll conductance to CO2.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- abscisic acidt1
- Outcome
- mesophyll conductance to CO2e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease of the mesophyll conductance to CO2”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
ABA did not significantly influence leaf water conductance.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- ABAe0
- Outcome
- water conductance of a leafe0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA did not significantly influence water conductance of a leaf”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
ABA did not significantly influence Calvin–Benson-cycle CO2 fixation parameters.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- ABAe0
- Outcome
- parameters of the CO2 fixation in Calvin–Benson cyclee0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA did not significantly influence water conductance of a leaf and parameters of the CO2 fixation in Calvin–Benson cycle”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
Reduced mesophyll CO2 conductance was proposed to explain the decrease in photosynthetic CO2 assimilation.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Outcome
- decrease in the photosynthetic assimilation of CO2e0
- Qualifier
- A decrease of the mesophyll conductance to CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease of the mesophyll conductance to CO2 was probably a mechanism of the decrease in the photosynthetic assimilation of CO2”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
The decrease in mesophyll CO2 conductance was proposed to be related to decreased plasma-membrane CO2 conductance.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Outcome
- decrease of the mesophyll conductance to CO2e0
- Qualifier
- decrease of the plasma membrane conductance to carbon dioxidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease of the mesophyll conductance to CO2 was related with a decrease of the plasma membrane conductance to carbon dioxide”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
H+-ATP-ase inactivation and extracellular pH changes were proposed as a mechanism for decreased conductance.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Gene
- H+-ATP-asee0
- Outcome
- this decreasee0
- Qualifier
- changes in extracellular pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inactivation of H+-ATP-ase and changes in extracellular pH can be a mechanism of this decrease”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
Claim · model-written summary
The metabolic component of electrical resting potential decreased after ABA treatment.
- Taxon
- pea and wheatLathyrus oleraceusTriticum aestivumt0
- Treatment
- ABA treatmente0
- Outcome
- metabolic component of the electrical resting potentiale0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease of the metabolic component of the electrical resting potential after the ABA treatment”
t0“pea and wheat”
t1“exogenous abscisic acid (ABA)”
The same questions in other papers
(+)-abscisic acid · physiology: photosynthesis · Triticum aestivum (wheat)Results differ
2 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 papers →(+)-abscisic acid · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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.