Abstract
Alcaligenes faecalis No.4 (No.4), which showed a significant suppressive effect on the growth of 13 kinds of plant pathogens in vitro, produced hydroxylamine, nitrite and nitrate in liquid cultivation. This indicates that No.4 is a heterotrophic nitrifier. As hydroxylamine solution formed a clear growth inhibitory zone on a plate inoculated with Rhizoctonia solani K-1 in vitro, the aforementioned suppressive effect was considered to be due to the hydroxylamine produced by No.4 during heterotrophic nitrification. When culture broth, cell suspension and supernatant of No.4 were applied to sterilized soil containing R. solani, the damping-off of tomato seedlings caused by R. solani was suppressed significantly. However, in non-sterilized soil, damping-off was suppressed only by the culture broth and the cell suspension treatments, presumably because hydroxylamine in the supernatant was decomposed in soil. Transposon mutagenesis was applied to No.4 to produce a non-hydroxylamine-producing mutant, No.4-1, which showed no suppressive effect on the growth of R. solani either in vitro or in vivo. These data indicate that the hydroxylamine produced by No.4 is involved in the suppression of damping-off caused by R. solani.
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Claims 8
Claim · model-written summary
Alcaligenes faecalis No.4 significantly suppressed the growth of 13 kinds of plant pathogens in vitro.
- Taxon
- Alcaligenes faecalis No.4
Alcaligenes faecalise1 - Interactor
- plant pathogense1pathogen
- Second interactor
- Alcaligenes faecalis No.4Alcaligenes faecalise1biocontrol_agent
- Outcome
- suppressive effect on the growth of 13 kinds of plant pathogense1
- Setting
- in vitroe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alcaligenes faecalis No.4 (No.4), which showed a significant suppressive effect on the growth of 13 kinds of plant pathogens in vitro”
Claim · model-written summary
In liquid cultivation, A. faecalis No.4 produced hydroxylamine, nitrite and nitrate.
- Taxon
- Alcaligenes faecalisAlcaligenes faecalist0
- Outcome
- hydroxylamine, nitrite and nitratee1
- Setting
- liquid cultivatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“produced hydroxylamine, nitrite and nitrate in liquid cultivation”
t0“the Heterotrophic Nitrifier Alcaligenes faecalis”
Claim · model-written summary
The authors conclude that No.4 is a heterotrophic nitrifier.
- Taxon
- Alcaligenes faecalisAlcaligenes faecalist0
- Outcome
- heterotrophic nitrifiere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“No.4 is a heterotrophic nitrifier”
t0“the Heterotrophic Nitrifier Alcaligenes faecalis”
Claim · model-written summary
A hydroxylamine solution formed a clear growth inhibitory zone on a plate inoculated with Rhizoctonia solani K-1 in vitro.
- Taxon
- Rhizoctonia solani K-1
Rhizoctonia solanie1 - Treatment
- hydroxylamine solutione1
- Interactor
- Rhizoctonia solani K-1Rhizoctonia solanie1pathogen
- Outcome
- clear growth inhibitory zonee1
- Setting
- in vitroe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“hydroxylamine solution formed a clear growth inhibitory zone on a plate inoculated with Rhizoctonia solani K-1 in vitro”
Claim · model-written summary
In sterilized soil containing R. solani, culture broth, cell suspension and supernatant of No.4 each significantly suppressed damping-off of tomato seedlings.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- culture broth, cell suspension and supernatant of No.4e1
- Interactor
- R. solaniRhizoctonia solanie1pathogen
- Second interactor
- No.4e1biocontrol_agent
- Outcome
- damping-off of tomato seedlingse1
- Direction
- suppressede1
- Setting
- sterilized soile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“culture broth, cell suspension and supernatant of No.4 were applied to sterilized soil containing R. solani, the damping-off of tomato seedlings caused by R. solani was suppressed significantly”
Claim · model-written summary
In non-sterilized soil, damping-off of tomato was suppressed only by the culture broth and cell suspension treatments of No.4, not by the supernatant.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- the culture broth and the cell suspension treatmentse1
- Interactor
- Rhizoctonia solaniRhizoctonia solanit0pathogen
- Outcome
- damping-offe1
- Direction
- suppressede1
- Setting
- non-sterilized soile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in non-sterilized soil, damping-off was suppressed only by the culture broth and the cell suspension treatments”
t0“Tomato Damping-off Caused by Rhizoctonia solani”
Claim · model-written summary
The non-hydroxylamine-producing transposon mutant No.4-1 showed no suppressive effect on the growth of R. solani in vitro or in vivo.
- Taxon
- R. solaniRhizoctonia solanie1
- Treatment
- non-hydroxylamine-producing mutant, No.4-1e1
- Interactor
- R. solaniRhizoctonia solanie1pathogen
- Second interactor
- No.4-1e1biocontrol_agent
- Outcome
- suppressive effect on the growth of R. solanie1
- Direction
- no suppressive effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a non-hydroxylamine-producing mutant, No.4-1, which showed no suppressive effect on the growth of R. solani either in vitro or in vivo”
Claim · model-written summary
The authors conclude that hydroxylamine produced by No.4 is involved in the suppression of damping-off caused by R. solani.
- Taxon
- TomatoSolanum lycopersicumt0
- Interactor
- R. solaniRhizoctonia solanie1pathogen
- Compound
- hydroxylaminee1
- Outcome
- suppression of damping-offe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the hydroxylamine produced by No.4 is involved in the suppression of damping-off caused by R. solani”
t0“Tomato Damping-off Caused by Rhizoctonia solani”