Abstract
Trifolium repens was sampled from 10 areas dominated by each of Dactylis glomerata, Holcus lanatus, and Lolium perenne in each of three different-aged pastures. Cell extracts of nodule isolates of Rhizobium leguminosarum biovar. trifolii were compared using polyacrylamide gel electrophoresis. Each pasture contained a range of Rhizobium strains as defined by the protein profiles. No single strain was common to Trifolium sampled from the same grass species neighbourhood. The diversity of Rhizobium strains encountered was negatively correlated (r = −0.67; n = 9) with pasture age; old pastures showed a decrease in strain diversity. In addition, in the oldest pasture (45-year-old), tillers of the associated grasses were also sampled. In a glasshouse, ramets from each Trifolium clone and each of the three grass species were grown in all possible combinations with each of the three Rhizobium strains, plus Trifolium monocultures and an uninoculated control. All Trifolium clones gave increased yield in mixture with Lolium compared with yields with Dactylis and Holcus. Trifolium from the Holcus patches, in most cases, had higher yield than Trifolium from other grass patches. Rhizobium inoculation did not consistently increase Trifolium yield; it actually caused a decrease in yield when in mixture with Lolium. A significant Rhizobium × Trifolium interaction indicated a variable performance of each Trifolium genotype with different Rhizobium strains. The identity of the Trifolium clone had a significant effect on the yield of Holcus and Lolium, but not Dactylis. Total mixture yields were highest when Trifolium from a Lolium patch was part of the mixture. These results are discussed in the context of the hypothesis that Trifolium–grass coexistence is significantly influenced by Rhizobium strain differences.
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Claims 11
Claim · model-written summary
Each pasture contained a range of Rhizobium strains distinguished by protein profiles.
- Taxon
- Trifolium repens
Trifolium repense0 - Outcome
- range of Rhizobium strainse1
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e1“Each pasture contained a range of Rhizobium strains as defined by the protein profiles”
Claim · model-written summary
No single Rhizobium strain was common to Trifolium sampled from the same grass neighbourhood.
- Taxon
- Trifolium repensTrifolium repense0
- Outcome
- No single strain was common to Trifolium sampled from the same grass species neighbourhoode2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e2“No single strain was common to Trifolium sampled from the same grass species neighbourhood”
Claim · model-written summary
Rhizobium strain diversity is negatively correlated with pasture age.
- Taxon
- Trifolium repensTrifolium repense0
- Treatment
- pasture agee3
- Outcome
- diversity of Rhizobium strainse3
- Direction
- negatively correlatede3
- Value
- r = −0.67; n = 9e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e3“The diversity of Rhizobium strains encountered was negatively correlated (r = −0.67; n = 9) with pasture age”
Claim · model-written summary
All Trifolium clones gave increased yield in mixture with Lolium compared with mixtures with Dactylis and Holcus.
Trifolium
LoliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e4“All Trifolium clones gave increased yield in mixture with Lolium compared with yields with Dactylis and Holcus”
Claim · model-written summary
Trifolium from Holcus patches had higher yield than Trifolium from other grass patches in most cases.
- Treatment
- Trifolium from the Holcus patchese5
- Outcome
- yielde5
- Direction
- highere5
- Qualifier
- in most casese5
- Comparator
- other grass patchese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e5“Trifolium from the Holcus patches, in most cases, had higher yield than Trifolium from other grass patches”
Claim · model-written summary
Rhizobium inoculation did not consistently increase Trifolium yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e6“Rhizobium inoculation did not consistently increase Trifolium yield; it actually caused a decrease in yield when in mixture with Lolium”
Claim · model-written summary
Rhizobium inoculation decreased Trifolium yield when grown in mixture with Lolium.
- Treatment
- Rhizobium inoculatione6
- Outcome
- yielde6
- Direction
- decreasee6
- Qualifier
- when in mixture with Loliume6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e6“Rhizobium inoculation did not consistently increase Trifolium yield; it actually caused a decrease in yield when in mixture with Lolium”
Claim · model-written summary
The identity of the Trifolium clone significantly affects the yield of Holcus and Lolium.
- Taxon
- Trifolium repensTrifolium repense0
- Material
- Trifolium clonee7
- Outcome
- yield of Holcus and Loliume7
HolcusNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e7“The identity of the Trifolium clone had a significant effect on the yield of Holcus and Lolium, but not Dactylis”
Claim · model-written summary
The identity of the Trifolium clone does not significantly affect the yield of Dactylis.
- Taxon
- Trifolium repensTrifolium repense0
- Material
- Trifolium clonee7
- Outcome
- yielde7
DactylisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e7“The identity of the Trifolium clone had a significant effect on the yield of Holcus and Lolium, but not Dactylis”
Claim · model-written summary
Total mixture yields are highest when Trifolium from a Lolium patch is part of the mixture.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e1“Total mixture yields were highest when Trifolium from a Lolium patch was part of the mixture”
Claim · model-written summary
The performance of each Trifolium genotype varies with different Rhizobium strains, as shown by a significant Rhizobium × Trifolium interaction.
- Taxon
- Trifolium repensTrifolium repense0
- Material
- Trifolium genotypee1
- Treatment
- different Rhizobium strainse1
- Outcome
- performancee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trifolium repens was sampled from 10 areas”
e1“A significant Rhizobium × Trifolium interaction indicated a variable performance of each Trifolium genotype with different Rhizobium strains”
The same questions in other papers
Rhizobium · yield · TrifoliumPositive and negative results
1 in the opposite direction
- positive
inoculation · yield · TrifoliumPositive and negative results
1 paper in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.