Abstract
Bacterial wilt caused by Ralstonia solanacearum is the most widespread plant disease in tropical and subtropical regions. In Martinique (French West Indies), the bacterial wilt situation changed dramatically after 1999 with the emergence of strains of R. solanacearum assigned to a new genotype, phylotype IIB/4NPB, which is highly pathogenic for solanaceous crops, especially tomato. Due to the limited efficacy of current strategies for the management of bacterial wilt, new control strategies such as biorational soil treatments are required. We investigated the effects of three differently scented chemotypes of essential oils of Pimenta racemosa var. racemosa (lemongrass, aniseed and clove scents) on the emerging strain of R. solanacearum (phylotype IIB/4NPB), their potential use as biofumigants to reduce bacterial wilt disease of tomato, and their effect on tomato growth. Three concentrations of the oils (0.04, 0.07, and 0.14% vol/vol) were evaluated by in vitro culture amendment assays and in vivo experiments in a greenhouse. In the culture amendment assays, with lemongrass scented and aniseed scented oil chemotypes at concentrations of 0.04% and 0.07% respectively, both oils significantly reduced the growth of R. solanacearum compared with the control, and at 0.14% they completely inhibited bacterial growth. With the clove scented chemotype, complete inhibition of R. solanacearum growth was achieved at all the concentrations tested. No incidence of tomato bacterial wilt was observed after treatment with the clove scented chemotype of Pimenta racemosa when the tomato plants were planted in essential oil-treated soil. In the untreated control soil, bacterial wilt affected 64% of the tomato plants whereas with the clove scented chemotype at a concentration of 0.14%, no bacterial wilt was observed on tomato. Treatment with the clove scented chemotype significantly increased the growth of tomato plants compared with the untreated control. These results suggest that essential oil of Pimenta racemosa could be used as a soil biofumigant in biocontrol-based management strategies for bacterial wilt of tomato. (Texte intégral)
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Claims 7
Claim · model-written summary
Lemongrass oil at 0.04% reduced bacterial growth in vitro.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- lemongrass scentede0
- Interactor
- R. solanacearum
Ralstonia solanacearume0pathogen - Outcome
- growth of R. solanacearume0
- Direction
- reducede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with lemongrass scented and aniseed scented oil chemotypes at concentrations of 0.04% and 0.07% respectively, both oils significantly reduced the growth of R. solanacearum compared with the control”
t0“Effectiveness of leaf oil of Pimenta racemosa (Mill) J.W. Moore on R. solanacearum population and bacterial wilt of tomato”
Claim · model-written summary
Aniseed oil at 0.07% reduced bacterial growth in vitro.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- aniseed scented oil chemotypese0
- Interactor
- R. solanacearumRalstonia solanacearume0pathogen
- Outcome
- growth of R. solanacearume0
- Direction
- reducede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with lemongrass scented and aniseed scented oil chemotypes at concentrations of 0.04% and 0.07% respectively, both oils significantly reduced the growth of R. solanacearum compared with the control”
t0“Effectiveness of leaf oil of Pimenta racemosa (Mill) J.W. Moore on R. solanacearum population and bacterial wilt of tomato”
Claim · model-written summary
Both oil types completely inhibited bacterial growth at 0.14%.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- bacterial growthe0
- Direction
- completely inhibitede0
- Value
- 0.14%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and at 0.14% they completely inhibited bacterial growth.”
t0“Effectiveness of leaf oil of Pimenta racemosa (Mill) J.W. Moore on R. solanacearum population and bacterial wilt of tomato”
Claim · model-written summary
Clove oil completely inhibited bacterial growth at every tested concentration.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- clove scented chemotypee0
- Interactor
- R. solanacearumRalstonia solanacearume0pathogen
- Outcome
- R. solanacearum growthe0
- Direction
- complete inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the clove scented chemotype, complete inhibition of R. solanacearum growth was achieved at all the concentrations tested.”
t0“Effectiveness of leaf oil of Pimenta racemosa (Mill) J.W. Moore on R. solanacearum population and bacterial wilt of tomato”
Claim · model-written summary
Clove oil treated soil prevented tomato wilt, compared with 64% in untreated soil.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- clove scented chemotype at a concentration of 0.14%e0
- Outcome
- bacterial wilte0
- Direction
- no bacterial wilte0
- Qualifier
- 64%e0
- Comparator
- untreated control soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the untreated control soil, bacterial wilt affected 64% of the tomato plants whereas with the clove scented chemotype at a concentration of 0.14%, no bacterial wilt was observed on tomato.”
Claim · model-written summary
Clove oil significantly increased tomato growth.
- Taxon
- tomato plantsSolanum lycopersicume0
- Treatment
- clove scented chemotypee0
- Outcome
- growthe0
- Direction
- increasede0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with the clove scented chemotype significantly increased the growth of tomato plants compared with the untreated control.”
Claim · model-written summary
The authors propose Pimenta oil as a soil biofumigant for tomato wilt control.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- soil biofumigant in biocontrol-based management strategies for bacterial wilte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that essential oil of Pimenta racemosa could be used as a soil biofumigant in biocontrol-based management strategies for bacterial wilt of tomato.”
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