Abstract
Increases in endogenous salicylic acid (SA) levels and induction of several families of pathogenesis-related genes (PR-1 through PR-5) occur during the resistance response of tobacco to tobacco mosaic virus infection. We found that at temperatures that prevent the induction of PR genes and resistance, the increases in SA levels were eliminated. The addition of exogenous SA to infected plants at these temperatures was sufficient to induce the PR genes but not the hypersensitive response. However, when the resistance response was restored by shifting infected plants to permissive temperatures, SA levels increased dramatically and preceded PR-1 gene expression and necrotic lesion formation associated with resistance. SA was also found in a conjugated form whose levels increased in parallel with the free SA levels. The majority of the conjugates appeared to be SA glucosides. The same glucoside was formed when plants were supplied with exogenous SA. These results provide further evidence that endogenous SA signals the induction of certain defense responses and suggests additional complexity in the modulation of this signal.
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Claims 7
Claim · model-written summary
Nonpermissive temperatures eliminated increases in salicylic acid levels.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- temperatures that prevent the induction of PR genes and resistancee0
- Interactor
- tobacco mosaic virus
Tobacco mosaic virust0pathogen - Outcome
- increases in SA levelse0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at temperatures that prevent the induction of PR genes and resistance, the increases in SA levels were eliminated”
t0“tobacco mosaic virus”
Claim · model-written summary
Exogenous salicylic acid induced pathogenesis-related genes in infected plants at nonpermissive temperatures.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- exogenous SAe0
- Interactor
- tobacco mosaic virusTobacco mosaic virust0pathogen
- Outcome
- PR genese0
- Direction
- inducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of exogenous SA to infected plants at these temperatures was sufficient to induce the PR genes but not the hypersensitive response”
t0“tobacco mosaic virus”
Claim · model-written summary
Exogenous salicylic acid did not induce a hypersensitive response at nonpermissive temperatures.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- exogenous SAe0
- Interactor
- tobacco mosaic virusTobacco mosaic virust0pathogen
- Outcome
- hypersensitive responsee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of exogenous SA to infected plants at these temperatures was sufficient to induce the PR genes but not the hypersensitive response”
t0“tobacco mosaic virus”
Claim · model-written summary
Restoring permissive temperature dramatically increased salicylic acid levels before PR-1 expression and lesion formation.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- shifting infected plants to permissive temperaturese0
- Interactor
- tobacco mosaic virusTobacco mosaic virust0pathogen
- Outcome
- SA levelse0
- Direction
- increased dramaticallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the resistance response was restored by shifting infected plants to permissive temperatures, SA levels increased dramatically and preceded PR-1 gene expression and necrotic lesion formation associated with resistance”
t0“tobacco mosaic virus”
Claim · model-written summary
Conjugated salicylic acid levels rose in parallel with free salicylic acid.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- conjugated form whose levelse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA was also found in a conjugated form whose levels increased in parallel with the free SA levels”
t0“tobacco”
Claim · model-written summary
Most salicylic acid conjugates appeared to be glucosides.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- SA glucosidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The majority of the conjugates appeared to be SA glucosides”
t0“tobacco”
Claim · model-written summary
Exogenous salicylic acid supplied to plants formed the same glucoside.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- exogenous SAe0
- Outcome
- same glucosidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The same glucoside was formed when plants were supplied with exogenous SA”
t0“tobacco”
The same questions in other papers
salicylic acid · Tobacco mosaic virus · Nicotiana tabacum (tobacco)Positive and negative results
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- no effect
- negative
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See all 10 papers →infection · Tobacco mosaic virus · Nicotiana tabacum (tobacco)Positive and negative results
32 papers in the same direction as this paper · 29 in the opposite direction
- no effect
- positive
- negative
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See all 62 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.