Abstract
Local burning is known to generate and propagate variation potential (VP) in plants. VP affects different physiological processes, including reducing heat-related damage to photosystem I (PSI). We investigated mechanisms of the process. Photosynthesis parameters were measured with Dual-PAM-100 and GFS-3000. VP was induced by burning the first mature leaf and then waiting 5, 10, 15, or 20 min to initiate heating of the second mature leaf. Photosystems activities in the second leaf were investigated at 15 and 135 min after heating. In the absence of VP induction, when incubation in hot water (5 min) was used for heating the intact second leaf, PSI and PSII activities decreased after incubation at both exposure temperatures (45°C and 50°C). When local burning of the first leaf induced VP propagation into the second leaf, reduced photosynthesis (PSI) was observed. Arrival of VP in the second leaf prior to hot water incubation at 50°C decreased heating-induced suppression of PSI activity when measured 15 and 135 min later. Dependence of PSI activity on the time interval (5, 10, 15, or 20 min) between VP induction and heating of the second leaf was dissimilar at 15 and 135 min. Heat-induced suppression of PSII activity in the second leaf was stimulated after VP induction. In contrast, the effect of VP on PSI and PSII damage was weak when leaf 2 was heated at 45°C. VP-induced decrease of PSI activity suppression at 15 min after heating was correlated with stimulation of PSII activity suppression, but increase of PSI activity at 135 min after heating was not related to PSII activity. Thus, our results suggest the possibility of 2 different pathways of VP-induced decrease of heat-related PSI damage.
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Claims 9
Claim · model-written summary
Hot-water heating at 45°C and 50°C decreased PSI and PSII activity in pea leaves without VP induction.
- Taxon
- pea
Lathyrus oleraceust0 - Organ / stage
- second leafe0
- Treatment
- incubation in hot water (5 min)e0
- Outcome
- PSI and PSII activitiese0
- Direction
- decreasede0
- Qualifier
- 45°C and 50°Ce0
- Comparator
- absence of VP inductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of VP induction, when incubation in hot water (5 min) was used for heating the intact second leaf, PSI and PSII activities decreased after incubation at both exposure temperatures (45°C and 50°C).”
t0“pea”
Claim · model-written summary
Variation potential induced by burning the first leaf reduced PSI photosynthesis in the second pea leaf.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- second leafe0
- Treatment
- local burning of the first leafe0
- Outcome
- photosynthesis (PSI)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When local burning of the first leaf induced VP propagation into the second leaf, reduced photosynthesis (PSI) was observed.”
t0“pea”
Claim · model-written summary
Variation potential before 50°C heating decreased PSI activity suppression at 15 and 135 minutes.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- second leafe0
- Treatment
- Arrival of VPe0
- Outcome
- heating-induced suppression of PSI activitye0
- Direction
- decreasede0
- Value
- 15 and 135 mine0
- Qualifier
- 50°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arrival of VP in the second leaf prior to hot water incubation at 50°C decreased heating-induced suppression of PSI activity when measured 15 and 135 min later.”
t0“pea”
Claim · model-written summary
The PSI response to timing between VP induction and heating differed between 15 and 135 minutes.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- second leafe0
- Outcome
- Dependence of PSI activitye0
- Qualifier
- dissimilar at 15 and 135 mine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dependence of PSI activity on the time interval (5, 10, 15, or 20 min) between VP induction and heating of the second leaf was dissimilar at 15 and 135 min.”
t0“pea”
Claim · model-written summary
VP induction increased heat-induced PSII suppression.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- second leafe0
- Treatment
- VP inductione0
- Outcome
- Heat-induced suppression of PSII activitye0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat-induced suppression of PSII activity in the second leaf was stimulated after VP induction.”
t0“pea”
Claim · model-written summary
Variation potential had a weak effect on photosystem damage at 45°C.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- VPe0
- Outcome
- effect of VP on PSI and PSII damagee0
- Qualifier
- 45°Ce0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of VP on PSI and PSII damage was weak when leaf 2 was heated at 45°C.”
t0“pea”
Claim · model-written summary
The early decrease in PSI suppression correlated with stimulated PSII suppression.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- PSII activitye0
- Outcome
- PSI activity suppressione0
- Direction
- decreasee0
- Qualifier
- correlated with stimulation of PSII activity suppressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VP-induced decrease of PSI activity suppression at 15 min after heating was correlated with stimulation of PSII activity suppression”
t0“pea”
Claim · model-written summary
The later increase in PSI activity was not related to PSII activity.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- PSII activitye0
- Outcome
- PSI activitye0
- Direction
- increasee0
- Qualifier
- not related to PSII activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase of PSI activity at 135 min after heating was not related to PSII activity.”
t0“pea”
Claim · model-written summary
Authors suggest two pathways by which VP decreases heat-related PSI damage.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- heat-related PSI damagee0
- Direction
- decreasee0
- Qualifier
- 2 different pathwayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“our results suggest the possibility of 2 different pathways of VP-induced decrease of heat-related PSI damage.”
t0“pea”
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