Abstract
Early blight and Alternaria leaf spot are among the major diseases limiting productivity of tomatoes. Evolvement of pathogen into resistance form and detrimental effect of fungicides have spawned efforts to develop management strategies that are economic and environmentally friendly. Salicylic acid is a natural plant hormone known to induce plant defense against various biotic and abiotic stresses. Therefore, the main focus of this study was to evaluate the role of salicylic acid on tomato crop against Alternaria spp infection. A range of salicylic acid concentrations (1.0, 1.5, 2.0, 2.5 and 3.0 mM) and distilled water (control) were laid in a randomized complete block design. Peroxidase (POD), phenylalanine ammonia lyase (PAL) and polyphenol oxidase (PPO) enzyme activities were recorded from one to four weeks after inoculation with virulent Alternaria spp spores. The results showed that plants treated with 2.5 mM responded rapidly and significantly showed higher induction of POD, PAL and PPO enzyme activities. Plants sprayed with salicylic acid at 3 mM showed phytotoxic symptoms and reduced enzyme activity was recorded. In addition, foliar application of salicylic acid at 2.5 mM significantly (p<0.001) reduced disease severity (25.5 %) compared to plants treated with distilled water (85.46 % disease severity). These results showed that 2.5 mM of salicylic acid is safe and can be used in inducing tomato plant disease resistance.
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Claims 5
Claim · model-written summary
At 2.5 mM salicylic acid, tomato POD, PAL and PPO activities were significantly higher.
- Taxon
- tomatoes
Solanum lycopersicumt0 - Treatment
- 2.5 mMe0
- Interactor
- Alternaria spp
Alternariae1pathogen - Outcome
- POD, PAL and PPO enzyme activitiese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomatoes (Lycopersicon esculentum L.)”
e0“plants treated with 2.5 mM responded rapidly and significantly showed higher induction of POD, PAL and PPO enzyme activities”
e1“Alternaria spp infection”
Claim · model-written summary
Tomato plants sprayed with 3 mM salicylic acid showed phytotoxic symptoms.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- salicylic acid at 3 mMe0
- Outcome
- phytotoxic symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomatoes (Lycopersicon esculentum L.)”
e0“Plants sprayed with salicylic acid at 3 mM showed phytotoxic symptoms”
Claim · model-written summary
Tomato plants sprayed with 3 mM salicylic acid had reduced enzyme activity.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- salicylic acid at 3 mMe0
- Outcome
- enzyme activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomatoes (Lycopersicon esculentum L.)”
e0“Plants sprayed with salicylic acid at 3 mM showed phytotoxic symptoms and reduced enzyme activity was recorded”
Claim · model-written summary
Foliar salicylic acid at 2.5 mM reduced tomato disease severity to 25.5% versus 85.46% with distilled water.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- foliar application of salicylic acid at 2.5 mMe0
- Interactor
- Alternaria sppAlternariae1pathogen
- Outcome
- disease severitye0
- Direction
- reducede0
- Value
- 25.5 %e0
- Qualifier
- 85.46 % disease severitye0
- Comparator
- distilled watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomatoes (Lycopersicon esculentum L.)”
e0“foliar application of salicylic acid at 2.5 mM significantly (p<0.001) reduced disease severity (25.5 %) compared to plants treated with distilled water (85.46 % disease severity)”
e1“Alternaria spp infection”
Claim · model-written summary
The authors consider 2.5 mM salicylic acid safe for inducing tomato disease resistance.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- 2.5 mM of salicylic acide0
- Outcome
- can be used in inducing tomato plant disease resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomatoes (Lycopersicon esculentum L.)”
e0“2.5 mM of salicylic acid is safe and can be used in inducing tomato plant disease resistance”
The same questions in other papers
salicylic acid · soil: biology · Solanum lycopersicum (tomato)Positive and negative results
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- positive
- positive
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See all 6 papers →application · Alternaria · Solanum lycopersicum (tomato)Results agree
4 papers in the same direction as this paper
- positive
- positive
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See all 5 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.