Abstract
Local action of stressors induces fast changes in physiological processes in intact parts of plants including photosynthetic inactivation. This response is mediated by generation and propagation of depolarization electrical signals (action potentials and variation potentials) and participates in increasing plant tolerance to action of adverse factors. Earlier, we showed that a local action of physiological stimuli (moderate heating and blue light), which can be observed under environmental conditions, induces hyperpolarization electrical signals (system potentials) in wheat plants. It potentially means that these signals can play a key role in induction of fast physiological changes under the local action of environmental stressors. The current work was devoted to investigation of influence of hyperpolarization electrical signals induced by the local action of the moderate heating and blue light on parameters of photosynthetic light reactions. A quantum yield of photosystem II (Ф PSII ) and a non-photochemical quenching of chlorophyll fluorescence (NPQ) in wheat plants were investigated. It was shown that combination of the moderate heating (40°C) and blue light (540 µmol m -2 s -1 ) decreased Ф PSII and increased NPQ; these changes were observed in 3-5 cm from border of the irritated zone and dependent on intensity of actinic light. The moderate soil drought (7 days) increased magnitude of photosynthetic changes and shifted their localization which were observed on 5-7 cm from the irritated zone; in contrast, the strong soil drought (14 days) suppressed these changes. The local moderate heating decreased Ф PSII and increased NPQ without action of the blue light; in contrast, the local blue light action without heating weakly influenced these parameters. It meant that just local heating was mechanism of induction of the photosynthetic changes. Finally, propagation of hyperpolarization electrical signals (system potentials) was necessary for decreasing Ф PSII and increasing NPQ. Thus, our results show that hyperpolarization electrical signals induced by the local action of the moderate heating inactivates photosynthetic light reactions; this response is similar with photosynthetic changes induced by depolarization electrical signals. The soil drought and actinic light intensity can influence parameters of these photosynthetic changes.
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Claims 10
Claim · model-written summary
Combined moderate heating and blue light decreased wheat photosystem II quantum yield.
- Taxon
- wheat plants
Triticum aestivumt0 - Treatment
- combination of the moderate heating (40°C) and blue light (540 µmol m -2 s -1 )e0
- Outcome
- Ф PSIIe0
- Direction
- decreasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combination of the moderate heating (40°C) and blue light (540 µmol m -2 s -1 ) decreased Ф PSII and increased NPQ”
t0“wheat plants”
Claim · model-written summary
Combined moderate heating and blue light increased wheat NPQ.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- combination of the moderate heating (40°C) and blue light (540 µmol m -2 s -1 )e0
- Outcome
- NPQe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combination of the moderate heating (40°C) and blue light (540 µmol m -2 s -1 ) decreased Ф PSII and increased NPQ”
t0“wheat plants”
Claim · model-written summary
Moderate soil drought increased the magnitude of wheat photosynthetic changes.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- moderate soil drought (7 days)e0
- Outcome
- magnitude of photosynthetic changese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The moderate soil drought (7 days) increased magnitude of photosynthetic changes”
t0“wheat plants”
Claim · model-written summary
Moderate soil drought shifted wheat photosynthetic changes to 5-7 cm from the irritated zone.
- Taxon
- wheat plantsTriticum aestivumt0
- Outcome
- localizatione0
- Value
- 5-7 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shifted their localization which were observed on 5-7 cm from the irritated zone”
t0“wheat plants”
Claim · model-written summary
Strong soil drought suppressed wheat photosynthetic changes.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- strong soil drought (14 days)e0
- Outcome
- these changese0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the strong soil drought (14 days) suppressed these changes”
t0“wheat plants”
Claim · model-written summary
Local moderate heating alone decreased wheat photosystem II quantum yield.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- local moderate heatinge0
- Outcome
- Ф PSIIe0
- Direction
- decreasede0
- Comparator
- without action of the blue lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The local moderate heating decreased Ф PSII and increased NPQ without action of the blue light”
t0“wheat plants”
Claim · model-written summary
Local moderate heating alone increased wheat NPQ.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- local moderate heatinge0
- Outcome
- NPQe0
- Direction
- increasede0
- Comparator
- without action of the blue lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The local moderate heating decreased Ф PSII and increased NPQ without action of the blue light”
t0“wheat plants”
Claim · model-written summary
Local blue light alone weakly influenced wheat photosynthetic parameters.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- local blue light actione0
- Outcome
- these parameterse0
- Comparator
- without heatinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the local blue light action without heating weakly influenced these parameters”
t0“wheat plants”
Claim · model-written summary
Propagation of system potentials was necessary for the decrease in wheat photosystem II quantum yield.
- Taxon
- wheat plantsTriticum aestivumt0
- Outcome
- Ф PSIIe0
- Direction
- decreasinge0
- Qualifier
- propagation of hyperpolarization electrical signals (system potentials)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“propagation of hyperpolarization electrical signals (system potentials) was necessary for decreasing Ф PSII and increasing NPQ”
t0“wheat plants”
Claim · model-written summary
Propagation of system potentials was necessary for the increase in wheat NPQ.
- Taxon
- wheat plantsTriticum aestivumt0
- Outcome
- NPQe0
- Direction
- increasinge0
- Qualifier
- propagation of hyperpolarization electrical signals (system potentials)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“propagation of hyperpolarization electrical signals (system potentials) was necessary for decreasing Ф PSII and increasing NPQ”
t0“wheat plants”
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