Abstract
The effect of temperature on Fusarium wilt of lettuce (Lactuca sativa), caused by Fusarium oxysporum f. sp. lactucae, was examined in a controlled environment. Nine lettuce cultivars planted in infested potting mix (500 or 5,000 CFU/g) were maintained under high/low diurnal temperature regimes of 26/18°C, 28/20°C, or 33/26°C. Three cultivars were resistant to Fusarium wilt under all test conditions, and thus were little affected by differences in inoculum level or temperature. The remaining cultivars were more susceptible and manifested more severe symptoms at the higher inoculum level and when maintained at higher temperatures. The tendency for the disease to be more severe under warmer conditions may be due, in part, to an effect of temperature on growth of the pathogen. Radial growth rates calculated for six isolates of F. oxysporum f. sp. lactucae were observed to increase from 10°C up to an apparent maximum near 25°C. The results of this study suggest that growers can reduce the risk of damage from Fusarium wilt by avoiding susceptible cultivars during the warmest planting periods. Further, isolates of F. oxysporum f. sp. lactucae were shown to have a distinctive colony morphology in culture, which made it possible to distinguish them from nonpathogenic strains.
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Claims 7
Claim · model-written summary
Three lettuce cultivars resisted Fusarium wilt across test conditions.
Not reportedTaxon
Verbatim
e0“Three cultivars were resistant to Fusarium wilt under all test conditions”
Claim · model-written summary
Those resistant cultivars were little affected by inoculum level or temperature.
Not reportedTaxon
Verbatim
e0“Three cultivars were resistant to Fusarium wilt under all test conditions, and thus were little affected by differences in inoculum level or temperature”
Claim · model-written summary
Susceptible cultivars had more severe symptoms at higher inoculum level.
- Material
- remaining cultivarse0
- Treatment
- higher inoculum levele0
- Outcome
- severe symptomse0
- Direction
- more severee0
Not reportedTaxonComparator
Verbatim
e0“The remaining cultivars were more susceptible and manifested more severe symptoms at the higher inoculum level”
Claim · model-written summary
Susceptible cultivars had more severe symptoms at higher temperatures.
- Material
- remaining cultivarse0
- Treatment
- higher temperaturese0
- Outcome
- severe symptomse0
- Direction
- more severee0
Not reportedTaxonComparator
Verbatim
e0“The remaining cultivars were more susceptible and manifested more severe symptoms at the higher inoculum level and when maintained at higher temperatures”
Claim · model-written summary
Fusarium radial growth increased from 10°C to an apparent maximum near 25°C.
- Taxon
- Lettuce
Lactuca sativat0 - Interactor
- F. oxysporum f. sp. lactucae
Fusarium oxysporum f. sp. lactucaee0pathogen - Outcome
- Radial growth rates calculated for six isolates of F. oxysporum f. sp. lactucaee0
- Direction
- increasee0
- Value
- 25°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“Radial growth rates calculated for six isolates of F. oxysporum f. sp. lactucae were observed to increase from 10°C up to an apparent maximum near 25°C”
Claim · model-written summary
The authors advised avoiding susceptible lettuce cultivars during warmest planting periods to reduce wilt damage.
- Taxon
- LettuceLactuca sativat0
- Outcome
- avoiding susceptible cultivars during the warmest planting periodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“growers can reduce the risk of damage from Fusarium wilt by avoiding susceptible cultivars during the warmest planting periods”
Claim · model-written summary
Fusarium isolates had distinctive colony morphology distinguishing them from nonpathogenic strains.
- Taxon
- LettuceLactuca sativat0
- Interactor
- F. oxysporum f. sp. lactucaeFusarium oxysporum f. sp. lactucaee0pathogen
- Outcome
- distinctive colony morphology in culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce”
e0“isolates of F. oxysporum f. sp. lactucae were shown to have a distinctive colony morphology in culture, which made it possible to distinguish them from nonpathogenic strains”
The same questions in other papers
inoculation · disease · Lactuca sativa (garden lettuce)Positive and negative results
15 papers in the same direction as this paper · 13 in the opposite direction
- negative
- positive
- positive
25 papers more in this group
See all 29 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.