Abstract
Abstract Verticillium wilt is considered the most important disease of cotton in the world, including Iran. Cultural practices and the use of resistant varieties are the most common strategies used to control Verticillium wilt of cotton. These strategies are not always available or effective. In recent years, biological control using fungal and bacterial antagonists, has been applied to control some cotton diseases including damping-off. In this study, we investigated the possibility of biological control of Verticillium wilt of cotton using bacterial antagonists. Suspension of eight bacterial strains of Pseudomonas fluorescens and Bacillus spp. isolated from different rhizospheric soils and plant roots in the Iranian cotton fields, were prepared with a concentration of 108 cfu/ml. Ten cotton seeds (cv Varamin) were then coated with each bacterial suspension and were planted in soil pre-inoculated with Verticillium dahliae microsclerotia. The efficacy of bacterial antagonists in reducing wilt disease was evaluated by determination of the disease index in different treatments. The results indicated that most isolates were effective in reducing disease (compared to the untreated control) 90 days after sowing. Isolates B5, B6, B2, B7, and B3 were the most effective, respectively, in reducing wilt index. In contrast, isolates B1, B4, and B8 did not significantly reduce the disease. In general, P. fluorescens isolates were more effective than Bacillus isolates. This study suggests that bacterial antagonists might be potential biological control agents of cotton.
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Claims 4
Claim · model-written summary
Most of the eight bacterial isolates reduced cotton wilt disease relative to the untreated control 90 days after sowing.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- Suspension of eight bacterial strains of Pseudomonas fluorescens and Bacillus sppe2
- Interactor
- Verticillium dahliae
Verticillium dahliaee4pathogen - Second interactor
- Pseudomonas fluorescens and Bacillus sppe2biocontrol_agent
- Outcome
- diseasee3
- Direction
- reducinge3
- Qualifier
- 90 days after sowinge3
- Comparator
- untreated controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Verticillium wilt is considered the most important disease of cotton in the world”
e2“Suspension of eight bacterial strains of Pseudomonas fluorescens and Bacillus spp”
e3“most isolates were effective in reducing disease (compared to the untreated control) 90 days after sowing”
e4“planted in soil pre-inoculated with Verticillium dahliae microsclerotia”
Claim · model-written summary
Isolates B5, B6, B2, B7 and B3 were the most effective in reducing the wilt index.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- Isolates B5, B6, B2, B7, and B3e2
- Interactor
- Verticillium dahliaeVerticillium dahliaee3pathogen
- Outcome
- wilt indexe2
- Direction
- the most effectivee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Verticillium wilt is considered the most important disease of cotton in the world”
e2“Isolates B5, B6, B2, B7, and B3 were the most effective, respectively, in reducing wilt index”
e3“planted in soil pre-inoculated with Verticillium dahliae microsclerotia”
Claim · model-written summary
Isolates B1, B4 and B8 did not significantly reduce cotton disease.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- isolates B1, B4, and B8e2
- Outcome
- diseasee2
- Direction
- did not significantly reducee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Verticillium wilt is considered the most important disease of cotton in the world”
e2“isolates B1, B4, and B8 did not significantly reduce the disease”
Claim · model-written summary
P. fluorescens isolates were more effective than Bacillus isolates in reducing cotton wilt.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- P. fluorescens isolatese2
- Outcome
- effectivee2
- Direction
- more effectivee2
- Comparator
- Bacillus isolatese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Verticillium wilt is considered the most important disease of cotton in the world”
e2“P. fluorescens isolates were more effective than Bacillus isolates”
The same questions in other papers
inoculation · Verticillium dahliae · Gossypium hirsutum (cotton)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
3 papers more in this group
See all 7 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.