Abstract
The competitiveness of a Rhizobium leguminosarum strain was investigated at two separate locations in field inoculation studies on commercially grown peas. The soil at each location (sites I and II) contained an indigenous R. leguminosarum population of ca. 3 x 10 rhizobia per g of soil. At site I it was necessary to use an inoculum concentration as large as 4 x 10 CFU ml (2 x 10 bacteria seed) to establish the inoculum strain in the majority of nodules (73%). However, at site II the inoculum strain formed only 33% of nodules when applied at this (10 CFU ml) level. Establishment could not be further improved by increasing the inoculum concentration even as high as 10 CFU ml (9.6 x 10 bacteria seed). The inoculum strain could be detected at both sites 19 months after inoculation. Analysis by intrinsic antibiotic resistance patterns and plasmid DNA profiles indicated that a dominant strain(s) and plasmid pool existed among the indigenous population at site II. Competition experiments were carried out under laboratory conditions between a dominant indigenous isolate and the inoculum strain. Both strains were shown to be equally competitive.
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Claims 6
Claim · model-written summary
At site I, an inoculum concentration of 4 x 10 CFU ml established the inoculum strain in 73% of nodules.
- Taxon
- peas
Lathyrus oleraceuse0 - Treatment
- inoculum concentration as large as 4 x 10 CFU mle1
- Interactor
- Rhizobium leguminosarum
Rhizobium leguminosarumt0symbiont - Outcome
- majority of nodulese1
- Value
- 73%e1
- Setting
- site Ie1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Rhizobium leguminosarum Strain”
e0“field inoculation studies on commercially grown peas”
e1“At site I it was necessary to use an inoculum concentration as large as 4 x 10 CFU ml (2 x 10 bacteria seed) to establish the inoculum strain in the majority of nodules (73%)”
Claim · model-written summary
At site II, the inoculum strain formed only 33% of nodules at the 10 CFU ml inoculum level.
- Taxon
- peasLathyrus oleraceuse0
- Treatment
- 10 CFU mle2
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarumt0symbiont
- Outcome
- nodulese2
- Value
- 33%e2
- Setting
- site IIe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Rhizobium leguminosarum Strain”
e0“field inoculation studies on commercially grown peas”
e2“at site II the inoculum strain formed only 33% of nodules when applied at this (10 CFU ml) level”
Claim · model-written summary
Increasing the inoculum concentration up to 10 CFU ml did not further improve establishment of the inoculum strain.
- Taxon
- peasLathyrus oleraceuse0
- Treatment
- increasing the inoculum concentratione3
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarumt0symbiont
- Outcome
- Establishmente3
- Direction
- could not be further improvede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Rhizobium leguminosarum Strain”
e0“field inoculation studies on commercially grown peas”
e3“Establishment could not be further improved by increasing the inoculum concentration even as high as 10 CFU ml”
Claim · model-written summary
The inoculum strain was detected at both sites 19 months after inoculation.
- Taxon
- peasLathyrus oleraceuse0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarumt0symbiont
- Outcome
- detectede4
- Qualifier
- 19 months after inoculatione4
- Setting
- both sitese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“a Rhizobium leguminosarum Strain”
e0“field inoculation studies on commercially grown peas”
e4“The inoculum strain could be detected at both sites 19 months after inoculation”
Claim · model-written summary
A dominant strain and plasmid pool existed among the indigenous population at site II.
- Taxon
- peasLathyrus oleraceuse0
- Outcome
- dominant strain(s) and plasmid poole5
- Direction
- existede5
- Qualifier
- among the indigenous populatione5
- Setting
- site IIe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field inoculation studies on commercially grown peas”
e5“Analysis by intrinsic antibiotic resistance patterns and plasmid DNA profiles indicated that a dominant strain(s) and plasmid pool existed among the indigenous population at site II”
Claim · model-written summary
Under laboratory conditions, the inoculum strain and a dominant indigenous isolate were equally competitive.
- Taxon
- peasLathyrus oleraceuse0
- Outcome
- competitivee7
- Direction
- equallye7
- Comparator
- a dominant indigenous isolatee6
- Setting
- laboratory conditionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field inoculation studies on commercially grown peas”
e6“Competition experiments were carried out under laboratory conditions between a dominant indigenous isolate and the inoculum strain”
e7“Both strains were shown to be equally competitive”
The same questions in other papers
inoculation · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results differ
5 papers in the same direction as this paper · 11 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 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.