Abstract
Alfalfa root system morphology was evaluated in relation to root infection by Pythium spp. in developing seedlings in the field. Metalaxyl treatments (soil drench, seed treatment, or nontreated) were used to produce differing levels of root infection in the field. Experiments were conducted at an upland site on a research farm in Missouri in two consecutive years. Quantitative assessments of root system morphology were made using morphometric and topological classification techniques. A metalaxyl soil drench treatment reduced root colonization by Pythium spp. per unit root length compared with either the metalaxyl-treated seed treatment or untreated control in 1991 through the first 4 weeks after emergence. Root colonization by Pythium spp. was low in 1992 and no differences among treatments could be detected. In the 1991 field test, the metalaxyl soil treatment resulted in increased root system growth and complexity (greater length, more branches, faster growth rates) compared with the seed and control treatments over the first 4 weeks of seedling development. However, no effect of root infection on root system branching structure could be detected in either year. These results suggested that, under favorable environmental conditions, sublethal root infections of alfalfa seedlings by Pythium spp. can cause reductions in root system size and complexity under natural field conditions.
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Claims 6
Claim · model-written summary
A metalaxyl soil drench reduced Pythium root colonization per unit root length compared with the seed treatment or untreated control in 1991.
- Taxon
- Alfalfa
Medicago sativae1 - Treatment
- metalaxyl soil drench treatmente2
- Outcome
- root colonization by Pythium spp. per unit root lengthe2
- Direction
- reducede2
- Qualifier
- in 1991 through the first 4 weeks after emergencee2
- Comparator
- untreated controle2
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PythiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e1“Alfalfa root system morphology was evaluated in relation to root infection by Pythium spp. in developing seedlings in the field”
e2“A metalaxyl soil drench treatment reduced root colonization by Pythium spp. per unit root length compared with either the metalaxyl-treated seed treatment or untreated control in 1991 through the first 4 weeks after emergence”
Claim · model-written summary
The metalaxyl soil treatment increased root system growth and complexity compared with the seed and control treatments in the 1991 field test.
- Taxon
- AlfalfaMedicago sativae1
- Treatment
- metalaxyl soil treatmente3
- Outcome
- root system growth and complexitye3
- Direction
- increasede3
- Qualifier
- over the first 4 weeks of seedling developmente3
- Comparator
- seed and control treatmentse3
- Setting
- field teste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa root system morphology was evaluated in relation to root infection by Pythium spp. in developing seedlings in the field”
e3“In the 1991 field test, the metalaxyl soil treatment resulted in increased root system growth and complexity (greater length, more branches, faster growth rates) compared with the seed and control treatments over the first 4 weeks of seedling development”
Claim · model-written summary
Root infection had no detectable effect on root system branching structure.
- Taxon
- AlfalfaMedicago sativae1
- Treatment
- root infectione4
- Outcome
- root system branching structuree4
- Direction
- no_changeinferrede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa root system morphology was evaluated in relation to root infection by Pythium spp. in developing seedlings in the field”
e4“However, no effect of root infection on root system branching structure could be detected in either year”
Claim · model-written summary
Root colonization by Pythium spp. was low in 1992.
- Taxon
- AlfalfaMedicago sativae1
- Outcome
- Root colonization by Pythium spp.e5
- Direction
- lowe5
- Qualifier
- 1992e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa root system morphology was evaluated in relation to root infection by Pythium spp. in developing seedlings in the field”
e5“Root colonization by Pythium spp. was low in 1992”
Claim · model-written summary
In 1992 there were no differences in Pythium root colonization among treatments.
- Taxon
- AlfalfaMedicago sativae1
- Treatment
- treatmentse6
- Outcome
- Root colonization by Pythium spp.e6
- Direction
- no_changeinferrede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa root system morphology was evaluated in relation to root infection by Pythium spp. in developing seedlings in the field”
e6“Root colonization by Pythium spp. was low in 1992 and no differences among treatments could be detected”
Claim · model-written summary
Sublethal Pythium root infections were suggested to reduce root system size and complexity of alfalfa seedlings under natural field conditions.
- Taxon
- alfalfaMedicago sativae7
- Treatment
- sublethal root infectionse7
- Outcome
- root system size and complexitye7
- Direction
- reductionse7
- Qualifier
- under favorable environmental conditionse0
- Setting
- natural field conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“sublethal root infections of alfalfa seedlings by Pythium spp. can cause reductions in root system size and complexity under natural field conditions”
e0“under favorable environmental conditions”
The same questions in other papers
metalaxyl · growth · Medicago sativa (alfalfa)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
metalaxyl · Pythium · Medicago sativa (alfalfa)Results agree
1 paper in the same direction as this paper
- positive
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.