Abstract
SUMMARY Senecio vulgaris L., either healthy or inoculated with rust ( Puccinia lagenophorae Cooke), was grown in monoculture or in mixture with Capsella bursa‐pastoris (L.) Medic, under high or low nutrient conditions. At harvests made 7, 9, and 11 weeks after sowing, uninfected S. vulgaris progressively outcompeted C. bursa‐pastoris under nutrient‐rich conditions. Rust infection eliminated the competitive advantage of S. vulgaris over C. bursa‐pastoris under high nutrient conditions. In contrast, under low nutrient conditions C. bursa‐pastoris outcompeted uninfected S. vulgaris and infection with P. lagenophorae resulted in no additional competitive disadvantage to its host. The reduced competitiveness of rusted S. vulgaris under high nutrient conditions was associated with reductions in root growth in mixtures that were greater than those caused by rust in monocultures. The effects of nutrient supply, rust infection and competition on tissue concentrations of nitrogen, phosphorus and potassium were complex and often influenced by interactions between these factors. Increasing the nutrient supply increased nitrogen concentrations ([N]) in S. vulgaris , as did rust infection, but the effects of infection were confined to monocultures. In general [N] in C. bursa‐pastoris showed rather less variation. Phosphorus concentrations ([P]) in C. bursa‐pastoris increased with nutrient supply but under nutrient‐rich conditions were reduced by competition. In S. vulgaris [P] increased with increasing nutrient supply and with infection but in both cases responses were confined to monoculture. Potassium concentration ([K]) in S. vulgaris was increased by rust, especially in mixtures. In C. bursa‐pastoris [K] under high nutrient levels was higher in mixtures than in monoculture. The mechanisms by which the effects of rust on host competitiveness differed under high and low nutrient conditions are considered and the implications for our understanding of the role of rusts in natural vegetation are discussed.
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Claims 14
Claim · model-written summary
Uninfected S. vulgaris progressively outcompeted C. bursa‐pastoris under nutrient-rich conditions.
- Taxon
- S. vulgaris
_(10171293746).jpg?width=60)
Senecio vulgarise0 - Interactor
- C. bursa‐pastorise0weed
- Outcome
- outcompeted C. bursa‐pastorise0
- Direction
- outcompetede0
- Qualifier
- nutrient‐rich conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(10171293746).jpg?width=500)
Verbatim
e0“uninfected S. vulgaris progressively outcompeted C. bursa‐pastoris under nutrient‐rich conditions”
Claim · model-written summary
Rust infection eliminated the competitive advantage of S. vulgaris under high nutrients.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- Rust infectione0
- Interactor
- Puccinia lagenophorae Cooke
Puccinia lagenophoraee1pathogen - Outcome
- competitive advantage of S. vulgaris over C. bursa‐pastorise0
- Direction
- eliminatede0
- Qualifier
- high nutrient conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust infection eliminated the competitive advantage of S. vulgaris over C. bursa‐pastoris under high nutrient conditions”
e1“Senecio vulgaris L., either healthy or inoculated with rust ( Puccinia lagenophorae Cooke), was grown in monoculture or in mixture with Capsella bursa‐pastoris (L.) Medic, under high or low nutrient conditions.”
Claim · model-written summary
Under low nutrients C. bursa‐pastoris outcompeted uninfected S. vulgaris.
- Taxon
- C. bursa‐pastorise0
- Interactor
- S. vulgarisSenecio vulgarise0weed
- Outcome
- outcompeted uninfected S. vulgarise0
- Direction
- outcompetede0
- Qualifier
- low nutrient conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under low nutrient conditions C. bursa‐pastoris outcompeted uninfected S. vulgaris”
Claim · model-written summary
Under low nutrients rust infection caused no additional competitive disadvantage to S. vulgaris.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- infection with P. lagenophoraee0
- Interactor
- P. lagenophoraePuccinia lagenophoraee0pathogen
- Outcome
- competitive disadvantagee0
- Direction
- no additionale0
- Qualifier
- low nutrient conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under low nutrient conditions C. bursa‐pastoris outcompeted uninfected S. vulgaris and infection with P. lagenophorae resulted in no additional competitive disadvantage to its host”
Claim · model-written summary
Rust-associated loss of competitiveness under high nutrients was associated with greater root-growth reductions in mixtures than monocultures.
- Taxon
- S. vulgarisSenecio vulgarise0
- Organ / stage
- roote0
- Treatment
- rustede0
- Outcome
- root growthe0
- Direction
- reductionse0
- Qualifier
- high nutrient conditionse0
- Comparator
- monoculturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduced competitiveness of rusted S. vulgaris under high nutrient conditions was associated with reductions in root growth in mixtures that were greater than those caused by rust in monocultures”
Claim · model-written summary
Higher nutrient supply increased S. vulgaris nitrogen concentrations.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- Increasing the nutrient supplye0
- Outcome
- nitrogen concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the nutrient supply increased nitrogen concentrations ([N]) in S. vulgaris”
Claim · model-written summary
Rust infection increased S. vulgaris nitrogen concentrations only in monoculture.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- rust infectione0
- Outcome
- nitrogen concentrationse0
- Direction
- increasede0
- Qualifier
- monoculturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the nutrient supply increased nitrogen concentrations ([N]) in S. vulgaris , as did rust infection, but the effects of infection were confined to monocultures”
Claim · model-written summary
C. bursa‐pastoris nitrogen concentration varied less in general.
Verbatim
e0“In general [N] in C. bursa‐pastoris showed rather less variation”
Claim · model-written summary
Nutrient supply increased phosphorus concentration in C. bursa‐pastoris.
- Taxon
- C. bursa‐pastorise0
- Treatment
- nutrient supplye0
- Outcome
- Phosphorus concentrationse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Phosphorus concentrations ([P]) in C. bursa‐pastoris increased with nutrient supply”
Claim · model-written summary
Competition reduced phosphorus concentration in C. bursa‐pastoris under high nutrients.
- Taxon
- C. bursa‐pastorise0
- Treatment
- competitione0
- Outcome
- Phosphorus concentrationse0
- Direction
- reducede0
- Qualifier
- nutrient‐rich conditionse0
Not reportedComparator
Verbatim
e0“Phosphorus concentrations ([P]) in C. bursa‐pastoris increased with nutrient supply but under nutrient‐rich conditions were reduced by competition”
Claim · model-written summary
Nutrient supply increased S. vulgaris phosphorus concentration only in monoculture.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- increasing nutrient supplye0
- Outcome
- [P]e0
- Direction
- increasede0
- Qualifier
- monoculturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In S. vulgaris [P] increased with increasing nutrient supply and with infection but in both cases responses were confined to monoculture”
Claim · model-written summary
Rust infection increased S. vulgaris phosphorus concentration only in monoculture.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- infectione0
- Outcome
- [P]e0
- Direction
- increasede0
- Qualifier
- monoculturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In S. vulgaris [P] increased with increasing nutrient supply and with infection but in both cases responses were confined to monoculture”
Claim · model-written summary
Rust increased S. vulgaris potassium concentration, especially in mixtures.
- Taxon
- S. vulgarisSenecio vulgarise0
- Treatment
- ruste0
- Outcome
- Potassium concentratione0
- Direction
- increasede0
- Qualifier
- mixturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium concentration ([K]) in S. vulgaris was increased by rust, especially in mixtures”
Claim · model-written summary
Under high nutrients C. bursa‐pastoris potassium concentration was higher in mixtures than monoculture.
Verbatim
e0“In C. bursa‐pastoris [K] under high nutrient levels was higher in mixtures than in monoculture”
The same questions in other papers
infection · Puccinia lagenophorae · Senecio vulgaris (old-man-in-the-Spring)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
1 paper more in this group
See all 5 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.