Abstract
The effect of rhizobiophages CT3 and CT4 on Rhizobium trifolii SU91 and SU36, respectively, was examined. These phage-susceptible strains were used, either singly or paired with a competing phage-resistant type as inoculum for Trifolium subterraneum plants growing in vitro in agar medium. Addition of bacteriophage to single strain experiments produced no significant effects on total bacterial numbers, nodulation, or plant dry weight. However, when phages were added to the paired inocula, significant decreases in counts of the susceptible strain were observed, frequently accompanied by a rise in numbers of the resistnt type. An increase in the proportion of ineffective variants of the susceptible rhizobia was also observed, although plant dry weights and nodule numbers were not altered. These effects were dependent only upon a difference in phage susceptibility of the bacteria and were obtained even when the competing strain was only partially resistant and a relativly poor competitor.
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Claims 6
Claim · model-written summary
Adding phage to single-strain inocula did not significantly alter bacterial numbers, nodulation, or plant dry weight.
- Taxon
- Trifolium subterraneum
Trifolium subterraneume1 - Treatment
- Addition of bacteriophagee0
- Outcome
- total bacterial numbers, nodulation, or plant dry weighte0
- Direction
- no significant effectse0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of bacteriophage to single strain experiments produced no significant effects on total bacterial numbers, nodulation, or plant dry weight.”
e1“Trifolium subterraneum plants growing in vitro in agar medium.”
Claim · model-written summary
In paired inocula, phages significantly decreased susceptible rhizobial strain counts.
- Taxon
- Trifolium subterraneumTrifolium subterraneume1
- Treatment
- phages were added to the paired inoculae0
- Outcome
- counts of the susceptible straine0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when phages were added to the paired inocula, significant decreases in counts of the susceptible strain were observed”
e1“Trifolium subterraneum plants growing in vitro in agar medium.”
Claim · model-written summary
Phage addition to paired inocula frequently increased numbers of the resistant type.
- Taxon
- Trifolium subterraneumTrifolium subterraneume2
- Treatment
- phages were added to the paired inoculae1
- Outcome
- numbers of the resistnt typee0
- Direction
- a risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“frequently accompanied by a rise in numbers of the resistnt type”
e1“when phages were added to the paired inocula”
e2“Trifolium subterraneum plants growing in vitro in agar medium.”
Claim · model-written summary
Phage addition increased the proportion of ineffective susceptible rhizobial variants.
- Taxon
- Trifolium subterraneumTrifolium subterraneume1
- Outcome
- proportion of ineffective variants of the susceptible rhizobiae0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in the proportion of ineffective variants of the susceptible rhizobia was also observed”
e1“Trifolium subterraneum plants growing in vitro in agar medium.”
Claim · model-written summary
In paired inocula, plant dry weights and nodule numbers were unchanged despite shifts in rhizobial populations.
- Taxon
- Trifolium subterraneumTrifolium subterraneume1
- Treatment
- phages were added to the paired inoculae2
- Outcome
- plant dry weights and nodule numberse0
- Direction
- not alterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant dry weights and nodule numbers were not altered”
e1“Trifolium subterraneum plants growing in vitro in agar medium.”
e2“when phages were added to the paired inocula”
Claim · model-written summary
The population effects depended only on differences in bacterial phage susceptibility and occurred with a partially resistant poor competitor.
- Taxon
- Trifolium subterraneumTrifolium subterraneume1
- Material
- competing straine0
- Outcome
- These effectse0
- Qualifier
- partially resistant and a relativly poor competitore0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These effects were dependent only upon a difference in phage susceptibility of the bacteria and were obtained even when the competing strain was only partially resistant and a relativly poor competitor.”
e1“Trifolium subterraneum plants growing in vitro in agar medium.”
The same questions in other papers
inoculation · disease · Trifolium subterraneumPositive and negative results
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- positive
- positive
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See all 6 papers →inoculation · symbiosis · Trifolium subterraneumPositive and negative results
1 paper in the same direction as this paper · 6 in the opposite direction
- positive
- positive
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See all 8 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.