Abstract
As the sun tracks daily through the sky from east to west, different parts of the canopy are exposed to high light (HL). The extent of and mechanisms by which a systemic acquired acclimation (SAA) response might preacclimate shaded leaves that will be subsequently exposed to full sunlight is largely undefined. We investigated the role of an Arabidopsis thaliana zinc finger transcription factor, ZAT10, in SAA. ZAT10 overexpression resulted in enhanced tolerance to photoinhibitory light and exogenous H2O2, increased expression of antioxidative genes whose products are targeted to multiple subcellular compartments. Partial HL exposure of a leaf or leaves rapidly induced ZAT10 mRNA in distal, shaded photosynthetic tissues, including the floral stem, cauline leaves, and rosette, but not in roots. Fully 86% of fivefold HL-upregulated and 71% of HL-downregulated genes were induced and repressed, respectively, in distal, shaded leaves. Between 15 and 23% of genes whose expression changed in the HL and/or distal tissues were coexpressed in the ZAT10 overexpression plants, implicating ZAT10 in modulating the expression of SAA-regulated genes. The SAA response was detectable in plants with mutations in abscisic acid, methyl jasmonate, or salicylic acid synthesis or perception, and systemic H2O2 diffusion was not detected. Hence, SAA is distinct from pathogen-stimulated systemic acquired resistance and apparently involves a novel signal or combination of signals that preacclimate photosynthetic tissues to HL.
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Claims 13
Claim · model-written summary
ZAT10 overexpression enhanced tolerance to photoinhibitory light.
- Taxon
- Arabidopsis
Arabidopsist0 - Treatment
- ZAT10 overexpressione0
- Gene
- ZAT10e0
- Outcome
- tolerance to photoinhibitory lighte0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZAT10 overexpression resulted in enhanced tolerance to photoinhibitory light and exogenous H2O2”
t0“Arabidopsis”
Claim · model-written summary
ZAT10 overexpression enhanced tolerance to exogenous H2O2.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- ZAT10 overexpressione0
- Gene
- ZAT10e0
- Outcome
- tolerance to photoinhibitory light and exogenous H2O2e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZAT10 overexpression resulted in enhanced tolerance to photoinhibitory light and exogenous H2O2”
t0“Arabidopsis”
Claim · model-written summary
ZAT10 overexpression increased expression of antioxidative genes.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- ZAT10 overexpressione0
- Gene
- ZAT10e0
- Outcome
- expression of antioxidative genese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZAT10 overexpression resulted in enhanced tolerance to photoinhibitory light and exogenous H2O2, increased expression of antioxidative genes whose products are targeted to multiple subcellular compartments.”
t0“Arabidopsis”
Claim · model-written summary
Partial high-light exposure rapidly induced ZAT10 mRNA in distal shaded photosynthetic tissues.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- floral stem, cauline leaves, and rosettee0
- Treatment
- Partial HL exposure of a leaf or leavese0
- Gene
- ZAT10e0
- Outcome
- ZAT10 mRNA in distal, shaded photosynthetic tissuese0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partial HL exposure of a leaf or leaves rapidly induced ZAT10 mRNA in distal, shaded photosynthetic tissues, including the floral stem, cauline leaves, and rosette, but not in roots.”
t0“Arabidopsis”
Claim · model-written summary
Partial high-light exposure did not induce ZAT10 mRNA in roots.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- rootse0
- Treatment
- Partial HL exposure of a leaf or leavese0
- Gene
- ZAT10e0
- Outcome
- ZAT10 mRNAe0
- Direction
- not in rootse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partial HL exposure of a leaf or leaves rapidly induced ZAT10 mRNA in distal, shaded photosynthetic tissues, including the floral stem, cauline leaves, and rosette, but not in roots.”
t0“Arabidopsis”
Claim · model-written summary
In distal shaded leaves, 86% of fivefold high-light-upregulated genes were induced.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- distal, shaded leavese0
- Outcome
- HL-upregulatede0
- Direction
- inducede0
- Value
- 86%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fully 86% of fivefold HL-upregulated and 71% of HL-downregulated genes were induced and repressed, respectively, in distal, shaded leaves.”
t0“Arabidopsis”
Claim · model-written summary
In distal shaded leaves, 71% of high-light-downregulated genes were repressed.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- distal, shaded leavese0
- Outcome
- HL-downregulated genese0
- Direction
- repressede0
- Value
- 71%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fully 86% of fivefold HL-upregulated and 71% of HL-downregulated genes were induced and repressed, respectively, in distal, shaded leaves.”
t0“Arabidopsis”
Claim · model-written summary
Between 15 and 23% of genes changing in high-light or distal tissue were coexpressed in ZAT10 overexpression plants.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- ZAT10e0
- Outcome
- genes whose expression changed in the HL and/or distal tissues were coexpressede0
- Value
- Between 15 and 23%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Between 15 and 23% of genes whose expression changed in the HL and/or distal tissues were coexpressed in the ZAT10 overexpression plants”
t0“Arabidopsis”
Claim · model-written summary
Systemic acquired acclimation remained detectable in plants with altered abscisic acid synthesis or perception.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- SAA response was detectablee0
- Qualifier
- mutations in abscisic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SAA response was detectable in plants with mutations in abscisic acid, methyl jasmonate, or salicylic acid synthesis or perception”
t0“Arabidopsis”
Claim · model-written summary
Systemic acquired acclimation remained detectable in plants with altered methyl jasmonate synthesis or perception.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- SAA response was detectablee0
- Qualifier
- methyl jasmonatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SAA response was detectable in plants with mutations in abscisic acid, methyl jasmonate, or salicylic acid synthesis or perception”
t0“Arabidopsis”
Claim · model-written summary
Systemic acquired acclimation remained detectable in plants with altered salicylic acid synthesis or perception.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- SAA response was detectablee0
- Qualifier
- salicylic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SAA response was detectable in plants with mutations in abscisic acid, methyl jasmonate, or salicylic acid synthesis or perception”
t0“Arabidopsis”
Claim · model-written summary
Systemic H2O2 diffusion was not detected.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- systemic H2O2 diffusion was not detectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“systemic H2O2 diffusion was not detected”
t0“Arabidopsis”
Claim · model-written summary
The authors infer that systemic acquired acclimation involves a novel signal or combination of signals.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- preacclimate photosynthetic tissues to HLe0
- Qualifier
- a novel signal or combination of signalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“apparently involves a novel signal or combination of signals that preacclimate photosynthetic tissues to HL”
t0“Arabidopsis”
The same questions in other papers
light · molecular: expression · ArabidopsisPositive and negative results
54 papers in the same direction as this paper · 21 in the opposite direction · 4 reporting no difference from an alternative
- negative
- positive
- positive
76 papers more in this group
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