Abstract
Electrical signals [action potentials (APs) and variation potentials (VPs)] induced by local stimuli are a mechanism that underlies rapid plant response to environmental factors. Such signals induce a number of functional responses, including changes in photosynthesis. Ultimately, these responses are considered to increase plant resistance to stress factors, but this question has been poorly investigated. We studied the influence of VP on photosynthesis and resistance of the photosynthetic machinery to heating in leaves of pea (Pisum sativum). Localized burning induced a VP that decreased photosynthesis parameters [CO(2) assimilation rate and quantum yields of photosystem I (PSI) and photosystem II (PSII)]. The photosynthetic response was initiated by a decrease in photosynthesis dark-stage activity, which in turn increased resistance of PSI to heating. Three results supported this hypothesized mechanism: (1) the magnitude of VP-induced decrease in CO(2) assimilation and enhanced PSI resistance to heating were highly correlated; (2) the VP influence on PSI resistance to heating was suppressed under a low external CO(2) concentration and (3) decreasing external CO(2) concentration imitated the VP-induced photosynthetic response and increased PSI resistance to heating.
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Claims 8
Claim · model-written summary
Localized burning induced a variation potential in pea leaves.
- Taxon
- pea
Lathyrus oleraceust0 - Treatment
- Localized burninge0
- Outcome
- VPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Localized burning induced a VP”
t0“pea”
Claim · model-written summary
A burning-induced variation potential lowered CO(2) assimilation and PSI and PSII quantum yields.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- Localized burninge0
- Outcome
- CO(2) assimilation rate and quantum yields of photosystem I (PSI) and photosystem II (PSII)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Localized burning induced a VP that decreased photosynthesis parameters [CO(2) assimilation rate and quantum yields of photosystem I (PSI) and photosystem II (PSII)]”
t0“pea”
Claim · model-written summary
The photosynthetic response began with decreased dark-stage activity.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- photosynthetic responsee0
- Qualifier
- decrease in photosynthesis dark-stage activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic response was initiated by a decrease in photosynthesis dark-stage activity”
t0“pea”
Claim · model-written summary
Reduced photosynthesis dark-stage activity increased PSI resistance to heating.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- resistance of PSI to heatinge0
- Direction
- increasede0
- Qualifier
- decrease in photosynthesis dark-stage activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease in photosynthesis dark-stage activity, which in turn increased resistance of PSI to heating”
t0“pea”
Claim · model-written summary
Variation-potential-induced decreases in CO(2) assimilation correlated strongly with increased PSI heat resistance.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- VP-induced decrease in CO(2) assimilatione0
- Outcome
- enhanced PSI resistance to heatinge0
- Direction
- enhancede0
- Qualifier
- highly correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the magnitude of VP-induced decrease in CO(2) assimilation and enhanced PSI resistance to heating were highly correlated”
t0“pea”
Claim · model-written summary
Low external CO(2) suppressed the effect of variation potential on PSI heat resistance.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- low external CO(2) concentratione0
- Outcome
- VP influence on PSI resistance to heatinge0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the VP influence on PSI resistance to heating was suppressed under a low external CO(2) concentration”
t0“pea”
Claim · model-written summary
Lowering external CO(2) reproduced the variation-potential-induced photosynthetic response.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- decreasing external CO(2) concentratione0
- Outcome
- VP-induced photosynthetic responsee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing external CO(2) concentration imitated the VP-induced photosynthetic response”
t0“pea”
Claim · model-written summary
Lowering external CO(2) increased PSI resistance to heating.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- decreasing external CO(2) concentratione0
- Outcome
- PSI resistance to heatinge0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing external CO(2) concentration imitated the VP-induced photosynthetic response and increased PSI resistance to heating”
t0“pea”
The same questions in other papers
fire · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
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- negative
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1 paper more in this group
See all 5 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.