Abstract
In tobacco plants reacting hypersensitively to pathogen infection, localized acquired resistance (LAR) is induced in a sharp zone surrounding hypersensitive response (HR) lesions. Using a fungal glycoprotein inducing HR and LAR when infiltrated at 50 nM into tobacco leaves, we have shown previously that a plant signal(s) is released by HR cells and diffuses to induce LAR. Here we address two questions: does LAR occur when HR is not induced, and is salicylic acid the (or one of the) mobile LAR signal? We found that application to tobacco leaves of 0.25 nM glycoprotein triggered defense responses without HR and without an H 2 O 2 burst. The analyzed responses include changes in expression of O-methyltransferase (OMT), 3-hydroxy-3-methylglutarylCoA reductase, pathogenesis-related (PR) proteins, and changes in levels of the signal salicylic acid. No defense responses and no increased resistance to tobacco mosaic virus infection were found beyond the elicitor-infiltrated tissue, providing strong evidence that there is no LAR without HR. Treatments of NahG tobacco leaves with 50 nM elicitor induced the HR and, in the sharp zone surrounding the HR lesion, a strong activation of OMT and of basic PR proteins, but not of acidic PR-1 proteins. This indicates that a signal different from salicylic acid is diffusing.
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Claims 7
Claim · model-written summary
Application of 0.25 nM fungal glycoprotein to tobacco leaves triggered defense responses without HR and without an H2O2 burst.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- 0.25 nM glycoproteine0
- Outcome
- defense responsese0
- Direction
- triggerede0
- Qualifier
- without HR and without an H 2 O 2 burste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application to tobacco leaves of 0.25 nM glycoprotein triggered defense responses without HR and without an H 2 O 2 burst”
Claim · model-written summary
No defense responses and no increased resistance to tobacco mosaic virus infection were found beyond the elicitor-infiltrated tissue.
- Taxon
- tobaccoNicotiana tabacume1
- Interactor
- tobacco mosaic virus
Tobacco mosaic viruse0pathogen - Outcome
- defense responses and no increased resistance to tobacco mosaic virus infectione0
- Qualifier
- beyond the elicitor-infiltrated tissuee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No defense responses and no increased resistance to tobacco mosaic virus infection were found beyond the elicitor-infiltrated tissue”
e1“application to tobacco leaves”
Claim · model-written summary
The authors conclude that localized acquired resistance does not occur without the hypersensitive response.
- Taxon
- tobaccoNicotiana tabacume1
- Outcome
- LARe0
- Qualifier
- no LAR without HRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no LAR without HR”
e1“tobacco plants reacting hypersensitively”
Claim · model-written summary
Treatment of NahG tobacco leaves with 50 nM elicitor induced the hypersensitive response.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- NahG tobaccoe0
- Treatment
- 50 nM elicitore0
- Outcome
- HRe0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments of NahG tobacco leaves with 50 nM elicitor induced the HR”
Claim · model-written summary
In the sharp zone around the HR lesion of elicitor-treated NahG tobacco leaves, OMT and basic PR proteins were strongly activated.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- NahG tobaccoe0
- Treatment
- 50 nM elicitore0
- Gene
- OMT and of basic PR proteinse1
- Outcome
- activation of OMT and of basic PR proteinse1
- Direction
- strong activatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments of NahG tobacco leaves with 50 nM elicitor”
e1“a strong activation of OMT and of basic PR proteins”
Claim · model-written summary
In the same zone, acidic PR-1 proteins were not activated.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- NahG tobaccoe0
- Treatment
- 50 nM elicitore0
- Gene
- acidic PR-1 proteinse1
- Outcome
- activatione1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments of NahG tobacco leaves with 50 nM elicitor”
e1“a strong activation of OMT and of basic PR proteins, but not of acidic PR-1 proteins”
Claim · model-written summary
The authors conclude that a signal different from salicylic acid diffuses around the HR lesion.
- Taxon
- tobaccoNicotiana tabacume1
- Compound
- salicylic acide0
- Outcome
- signal different from salicylic acid is diffusinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a signal different from salicylic acid is diffusing”
e1“tobacco plants reacting hypersensitively”
The same questions in other papers
glycoprotein · disease · Nicotiana tabacum (tobacco)Results agree
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- positive
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- positive
- positive
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9 papers more in this group
See all 13 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.