Abstract
Growth and efficacy of two biological control agents, Pseudomonas fluorescens Flugge, P-5 and P-6, were evaluated in combinations of two carbon (sucrose & molasses) and two nitrogen (urea & yeast extract) sources to optimize control of Rhizoctonia solani Kuhn, which is a causal agent of bean damping-off. Both strains were grown in five liquid media including: sucrose + yeast extract, molasses + yeast extract (2:1 w/w), molasses + yeast extract (1:1 w/w), molasses + urea and nutrient broth at an initial inoculation of 1×10 CFU mL. Cells from overnight cultures were used to inoculate soil at 1×10 CFU cm soil. At the same time, fungal inoculum was added to soil at the rate of 2 mg cm soil. The medium containing molasses and yeast extract (1:1 w/w) supported rapid growth and high cell yields in both strains. In greenhouse conditions, the influence of the media on the biocontrol efficacy of P-5 and P-6 was the same and P. fluorescens P-6 in molasses + yeast extract (in two different ratios) reduced the severity of disease from 90.9% to less than 28%. On the other hand, there were significant differences on bean growth promotion in greenhouse conditions, after one month. Strain P-5 in molasses + yeast extract (1:1 w/w) was more effective on bean growth promotion as compared to the other media.
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Claims 5
Claim · model-written summary
The molasses and yeast extract medium supported rapid growth and high cell yields in both biocontrol strains.
- Taxon
- beant0
- Treatment
- molasses and yeast extract (1:1 w/w)e0
- Interactor
- Pseudomonas fluorescens
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Pseudomonas fluorescenst0biocontrol_agent - Outcome
- rapid growth and high cell yields in both strainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“The medium containing molasses and yeast extract (1:1 w/w) supported rapid growth and high cell yields in both strains”
t0“Pseudomonas fluorescens P-5 and P-6 for bean damping-off disease.”
Claim · model-written summary
The media had the same biocontrol efficacy for P-5 and P-6.
Verbatim
e0“In greenhouse conditions, the influence of the media on the biocontrol efficacy of P-5 and P-6 was the same”
t0“bean”
Claim · model-written summary
P-6 in molasses and yeast extract reduced disease severity from 90.9% to under 28%.
- Taxon
- beant0
- Treatment
- P. fluorescens P-6 in molasses + yeast extracte0
- Outcome
- severity of diseasee0
- Direction
- reducede0
- Value
- less than 28%e0
- Qualifier
- 90.9%e0
Not reportedInteractorComparator
Verbatim
e0“P. fluorescens P-6 in molasses + yeast extract (in two different ratios) reduced the severity of disease from 90.9% to less than 28%”
t0“bean damping-off disease”
Claim · model-written summary
Bean growth promotion differed significantly among media after one month.
Not reportedDirection
Verbatim
e0“there were significant differences on bean growth promotion in greenhouse conditions, after one month”
Claim · model-written summary
P-5 in molasses and yeast extract was more effective for bean growth promotion than other media.
Verbatim
e0“Strain P-5 in molasses + yeast extract (1:1 w/w) was more effective on bean growth promotion as compared to the other media”
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