Abstract
We investigated the effects of root colonization by soil microbes on the subsequent colonization by a bacterial inoculant, Pseudomonas fluorescens MelRC2Rif. When a soil bacterial community was introduced onto tomato roots, subsequent colonization by MelRC2Rif was significantly lowered. However, soil fungi had no suppressive effects, suggesting that bacteria may be involved in the suppression. When individual bacterial strains were examined, most strains except for P. fluorescens showed no significant suppressive effect on subsequent colonization by MelRC2Rif. In contrast, four out of six P. fluorescens strains significantly suppressed subsequent colonization by MelRC2Rif. Gram-negative bacteria, which had little suppressive effect on colonization by MelRC2Rif with individual inoculation, elicited suppression in some combination treatments. Simultaneous inoculation of individual bacterial strains with MelRC2Rif indicated that suppressive effect by these strains occurred only when MelRC2Rif was inoculated later to tomato roots. These results suggest that a less competitive bacterial strain may interfere with the colonization of a competitive strain on tomato rhizospheres. Key words: ecological niche, bacterial colonization, rhizosphere, competition.
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Claims 7
Claim · model-written summary
Introducing a soil bacterial community onto tomato roots significantly lowered subsequent colonization by MelRC2Rif.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- soil bacterial communitye1
- Interactor
- MelRC2Rife1other
- Outcome
- subsequent colonization by MelRC2Rife1
- Direction
- lowerede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“When a soil bacterial community was introduced onto tomato roots, subsequent colonization by MelRC2Rif was significantly lowered”
Claim · model-written summary
Soil fungi had no suppressive effect on subsequent colonization of tomato roots by MelRC2Rif.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- soil fungie2
- Outcome
- suppressive effectse2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“introduced onto tomato roots”
e2“However, soil fungi had no suppressive effects”
Claim · model-written summary
Most individual bacterial strains other than P. fluorescens had no significant suppressive effect on subsequent colonization by MelRC2Rif.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- individual bacterial strainse3
- Interactor
- MelRC2Rife3other
- Outcome
- suppressive effect on subsequent colonization by MelRC2Rife3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“introduced onto tomato roots”
e3“When individual bacterial strains were examined, most strains except for P. fluorescens showed no significant suppressive effect on subsequent colonization by MelRC2Rif”
Claim · model-written summary
Four of six P. fluorescens strains significantly suppressed subsequent colonization by MelRC2Rif.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- P. fluorescens strainse4
- Interactor
- MelRC2Rife4other
- Second interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense4other - Outcome
- subsequent colonization by MelRC2Rife4
- Direction
- suppressede4
- Value
- four out of sixe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“introduced onto tomato roots”
e4“In contrast, four out of six P. fluorescens strains significantly suppressed subsequent colonization by MelRC2Rif”
Claim · model-written summary
Gram-negative bacteria, with little effect alone, suppressed MelRC2Rif colonization in some combination treatments.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Gram-negative bacteriae5
- Interactor
- MelRC2Rife5other
- Outcome
- colonization by MelRC2Rife5
- Direction
- elicited suppressione5
- Qualifier
- in some combination treatmentse5
- Comparator
- individual inoculatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“introduced onto tomato roots”
e5“Gram-negative bacteria, which had little suppressive effect on colonization by MelRC2Rif with individual inoculation, elicited suppression in some combination treatments”
Claim · model-written summary
Suppressive effect of individual strains on MelRC2Rif occurred only when MelRC2Rif was inoculated later than the strains.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- MelRC2Rif was inoculated latere6
- Interactor
- MelRC2Rife6other
- Outcome
- suppressive effecte6
- Qualifier
- occurred only whene6
- Comparator
- Simultaneous inoculatione6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“introduced onto tomato roots”
e6“Simultaneous inoculation of individual bacterial strains with MelRC2Rif indicated that suppressive effect by these strains occurred only when MelRC2Rif was inoculated later to tomato roots”
Claim · model-written summary
A less competitive bacterial strain may interfere with colonization of a competitive strain on tomato rhizospheres.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- less competitive bacterial straine7
- Outcome
- colonization of a competitive straine7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“introduced onto tomato roots”
e7“These results suggest that a less competitive bacterial strain may interfere with the colonization of a competitive strain on tomato rhizospheres”
The same questions in other papers
inoculation · disease · Solanum lycopersicum (tomato)Positive and negative results
129 papers in the same direction as this paper · 136 in the opposite direction
- positive
- positive
- positive
262 papers more in this group
See all 266 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.