Abstract
The expression pattern of pathogenesis-related genes PR-1, PR-2 and PR-5, considered as markers for salicylic acid (SA)-dependent systemic acquired resistance (SAR), was examined in the roots and shoots of tomato plants pre-treated with SA and subsequently infected with root-knot nematodes (RKNs) (Meloidogyne incognita). PR-1 was up-regulated in both roots and shoots of SA-treated plants, whereas the expression of PR-5 was enhanced only in roots. The over-expression of PR-1 in the whole plant occurred as soon as 1 day after SA treatment. Up-regulation of the PR-1 gene was considered to be the main marker of SAR elicitation. One day after treatment, plants were inoculated with active juveniles (J2s) of M. incognita. The number of J2s that entered the roots and started to develop was significantly lower in SA-treated than in untreated plants at 5 and 15 days after inoculation. The expression pattern of PR-1, PR-2 and PR-5 was also examined in the roots and shoots of susceptible and Mi-1-carrying resistant tomato plants infected by RKNs. Nematode infection produced a down-regulation of PR genes in both roots and shoots of SA-treated and untreated plants, and in roots of Mi-carrying resistant plants. Moreover, in resistant infected plants, PR gene expression, in particular PR-1 gene expression, was highly induced in shoots. Thus, nematode infection was demonstrated to elicit SAR in shoots of resistant plants. The data presented in this study show that the repression of host defence SA signalling is associated with the successful development of RKNs, and that SA exogenously added as a soil drench is able to trigger a SAR-like response to RKNs in tomato.
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Claims 8
Claim · model-written summary
SA treatment upregulated PR-1 in tomato roots and shoots.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- roots and shootse0
- Treatment
- SA-treatede0
- Gene
- PR-1e0
- Outcome
- PR-1e0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PR-1 was up-regulated in both roots and shoots of SA-treated plants, whereas the expression of PR-5 was enhanced only in roots.”
t0“tomato”
Claim · model-written summary
SA treatment enhanced PR-5 expression only in roots.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- rootse0
- Treatment
- SA-treatede0
- Gene
- PR-5e0
- Outcome
- expression of PR-5e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PR-1 was up-regulated in both roots and shoots of SA-treated plants, whereas the expression of PR-5 was enhanced only in roots.”
t0“tomato”
Claim · model-written summary
PR-1 overexpression throughout the plant occurred one day after SA treatment.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SA treatmente0
- Gene
- PR-1e0
- Outcome
- over-expression of PR-1e0
- Value
- 1 daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The over-expression of PR-1 in the whole plant occurred as soon as 1 day after SA treatment.”
t0“tomato”
Claim · model-written summary
Fewer M. incognita juveniles entered and developed in roots of SA-treated tomato than untreated plants at 5 and 15 days.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- rootse0
- Treatment
- SA-treatede0
- Outcome
- number of J2s that entered the roots and started to develope0
- Direction
- lowere0
- Qualifier
- at 5 and 15 days after inoculatione0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of J2s that entered the roots and started to develop was significantly lower in SA-treated than in untreated plants at 5 and 15 days after inoculation.”
t0“tomato”
Claim · model-written summary
Nematode infection downregulated PR genes in roots and shoots of SA-treated and untreated plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- roots and shootse0
- Treatment
- Nematode infectione0
- Gene
- PR genese0
- Outcome
- PR genese0
- Direction
- down-regulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nematode infection produced a down-regulation of PR genes in both roots and shoots of SA-treated and untreated plants, and in roots of Mi-carrying resistant plants.”
t0“tomato”
Claim · model-written summary
Nematode infection downregulated PR genes in roots of Mi-carrying resistant plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- Mi-carrying resistant plantse0
- Organ / stage
- rootse0
- Treatment
- Nematode infectione0
- Gene
- PR genese0
- Outcome
- PR genese0
- Direction
- down-regulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nematode infection produced a down-regulation of PR genes in both roots and shoots of SA-treated and untreated plants, and in roots of Mi-carrying resistant plants.”
t0“tomato”
Claim · model-written summary
In resistant infected plants, PR genes, especially PR-1, were highly induced in shoots.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- resistant infected plantse0
- Organ / stage
- shootse0
- Gene
- PR-1e0
- Outcome
- PR gene expressione0
- Direction
- highly inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, in resistant infected plants, PR gene expression, in particular PR-1 gene expression, was highly induced in shoots.”
t0“tomato”
Claim · model-written summary
The authors interpret the shoot expression response as nematode-elicited systemic acquired resistance in resistant tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- resistant plantse0
- Organ / stage
- shootse0
- Treatment
- nematode infectione0
- Outcome
- SAR in shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus, nematode infection was demonstrated to elicit SAR in shoots of resistant plants.”
t0“tomato”
The same questions in other papers
salicylic acid · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
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- positive
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See all 37 papers →infection · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
11 papers in the same direction as this paper · 26 in the opposite direction
- no effect
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See all 38 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.