Abstract
Cyclic electron flow is an important component of the total photosynthetic electron flow and participates in adaptation to the action of stressors. Local leaf stimulation induces electrical signals, including variation potential (VP), which inactivate photosynthesis; however, their influence on cyclic electron flow has not been investigated. The aim of this study was to investigate VP's influence on cyclic electron flow in pea (Pisum sativum L.). VP was induced in pea seedling leaves by local heating and measured in an adjacent, undamaged leaf by extracellular electrodes. CO2 assimilation was measured using a portable gas exchange measuring system. Photosystem I and II parameters were investigated using a measuring system for simultaneous assessment of P700 oxidation and chlorophyll fluorescence. Heating-induced VP reduced CO2 assimilation and electron flow through photosystem II. In response, cyclic electron flow rapidly decreased and subsequently slowly increased. Slow increases in cyclic flow were caused by decreased electron flow through photosystem II, which was mainly connected with VP-induced photosynthetic dark stage inactivation. However, direct influence by VP on photosystem I also participated in activation of cyclic electron flow. Thus, VP, induced by local leaf-heating, activated cyclic electron flow in undamaged leaves. This response was similar to photosynthetic changes observed under the direct action of stressors. Possible mechanisms of VP's influence on cyclic flow were discussed.
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Claims 6
Claim · model-written summary
Heating-induced variation potential reduced CO2 assimilation.
- Taxon
- pea
Lathyrus oleraceust0 - Treatment
- Heating-induced VPe0
- Outcome
- CO2 assimilatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating-induced VP reduced CO2 assimilation and electron flow through photosystem II.”
t0“pea”
Claim · model-written summary
Heating-induced variation potential reduced electron flow through photosystem II.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- Heating-induced VPe0
- Outcome
- electron flow through photosystem IIe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating-induced VP reduced CO2 assimilation and electron flow through photosystem II.”
t0“pea”
Claim · model-written summary
Cyclic electron flow decreased rapidly in response to variation potential.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- cyclic electron flowe0
- Direction
- decreasede0
- Qualifier
- rapidlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response, cyclic electron flow rapidly decreased and subsequently slowly increased.”
t0“pea”
Claim · model-written summary
Cyclic electron flow subsequently increased slowly.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- cyclic electron flowe0
- Direction
- increasede0
- Qualifier
- subsequently slowlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response, cyclic electron flow rapidly decreased and subsequently slowly increased.”
t0“pea”
Claim · model-written summary
Reduced photosystem II flow caused the slow cyclic flow increase.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- VP-induced photosynthetic dark stage inactivatione0
- Outcome
- Slow increases in cyclic flowe0
- Qualifier
- decreased electron flow through photosystem IIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Slow increases in cyclic flow were caused by decreased electron flow through photosystem II, which was mainly connected with VP-induced photosynthetic dark stage inactivation.”
t0“pea”
Claim · model-written summary
Direct variation potential influence on photosystem I also contributed to cyclic flow activation.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- VPe0
- Outcome
- activation of cyclic electron flowe0
- Qualifier
- photosystem Ie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“direct influence by VP on photosystem I also participated in activation of cyclic electron flow.”
t0“pea”
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