Abstract
Plants are able to acclimate to environmental constraints through functional modifications that may also occur in tissues that are not directly exposed to stress. This process is termed “systemic acquired acclimation.” The present study aims to evaluate the involvement of PolyADP-ribose) polymerase (PARP) protein in the acclimation process to high light (HL) stress in Phaseolus vulgaris plants. For this purpose, some leaves located at the top of the plant, in the apical position, were directly exposed to HL (“inducing” leaves), while others on the same plant, distal from the top, continued to be exposed to growth light (“receiving” leaves) to verify the hypothesis that an “alert” message may be transferred from injured tissues to distal ones. Biochemical and eco-physiological analyses, namely PARP activity, H2O2 and water- and fat-soluble antioxidants (i.e., ascorbic acid, tocopherol, glutathione (GSH), phenols, carotenoids, etc.) content, and chlorophyll fluorescence measurements were performed on both “inducing” and “receiving” leaves. Even if no change in PARP expression was found, its activity increased in “receiving” unstressed leaves in response to the light stress duration experimented by “inducing” leaves, while antioxidant capacity declined. When the “receiving” leaves were exposed to HL, the PARP activity returned to the control value, while antioxidant capacity photosynthetic electron transport rate (Jf) decreased and increased, respectively, compared to Control. Our results seem to show an acclimation pathway triggered in remote tissues not yet subjected to stress, likely involving a reactive oxygen species wave activating the PARP enzyme in a mechanism still to be clarified. In addition, the increased tolerance of plants directly exposed to HL could implicate a boosted synthesis of soluble antioxidants accompanied by a reduction of PARP activity to reduce excessive consumption of NAD(P).
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Claims 8
Claim · model-written summary
PARP expression did not change under the reported light stress conditions.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Gene
- PARPe1
- Outcome
- PARP expressione1
- Direction
- no changee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“no change in PARP expression was found”
Claim · model-written summary
PARP activity rose in receiving unstressed leaves with the light stress duration experienced by inducing leaves.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- “receiving” unstressed leavese1
- Gene
- PARPe2
- Outcome
- activitye1
- Direction
- increasede1
- Qualifier
- light stress duration experimented by “inducing” leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“its activity increased in “receiving” unstressed leaves in response to the light stress duration experimented by “inducing” leaves”
e2“the PARP activity returned to the control value”
Claim · model-written summary
Antioxidant capacity declined in receiving leaves during the inducing leaves’ light stress.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- “receiving” unstressed leavese1
- Outcome
- antioxidant capacitye1
- Direction
- declinede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1““receiving” unstressed leaves in response to the light stress duration experimented by “inducing” leaves, while antioxidant capacity declined”
Claim · model-written summary
PARP activity returned to control value after receiving leaves were exposed to high light.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- “receiving” leavese1
- Treatment
- exposed to HLe1
- Outcome
- PARP activitye1
- Direction
- returnede1
- Comparator
- control valuee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“When the “receiving” leaves were exposed to HL, the PARP activity returned to the control value”
Claim · model-written summary
Antioxidant capacity decreased after receiving leaves were exposed to high light compared with control.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- “receiving” leavese1
- Treatment
- exposed to HLe1
- Outcome
- antioxidant capacitye1
- Direction
- decreasede1
- Comparator
- Controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“When the “receiving” leaves were exposed to HL, the PARP activity returned to the control value, while antioxidant capacity photosynthetic electron transport rate (Jf) decreased and increased, respectively, compared to Control”
Claim · model-written summary
Photosynthetic electron transport rate increased after receiving leaves were exposed to high light compared with control.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- “receiving” leavese1
- Treatment
- exposed to HLe1
- Outcome
- photosynthetic electron transport rate (Jf)e1
- Direction
- increasede1
- Comparator
- Controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“When the “receiving” leaves were exposed to HL, the PARP activity returned to the control value, while antioxidant capacity photosynthetic electron transport rate (Jf) decreased and increased, respectively, compared to Control”
Claim · model-written summary
The authors suggest a remote acclimation pathway involving a reactive oxygen species wave and PARP activation.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Gene
- PARPe1
- Outcome
- acclimation pathway triggered in remote tissues not yet subjected to stresse1
- Qualifier
- likely involving a reactive oxygen species wavee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“Our results seem to show an acclimation pathway triggered in remote tissues not yet subjected to stress, likely involving a reactive oxygen species wave activating the PARP enzyme in a mechanism still to be clarified”
Claim · model-written summary
The authors suggest greater tolerance of directly exposed plants could involve soluble antioxidant synthesis and lower PARP activity.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Gene
- PARPe1
- Outcome
- increased tolerance of plants directly exposed to HLe1
- Qualifier
- could implicate a boosted synthesis of soluble antioxidants accompanied by a reduction of PARP activitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Phaseolus vulgaris plants”
e1“the increased tolerance of plants directly exposed to HL could implicate a boosted synthesis of soluble antioxidants accompanied by a reduction of PARP activity to reduce excessive consumption of NAD(P)”
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See all 15 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.