Abstract
SUMMARY Induction of disease symptoms and water loss from detached shoots placed in cell‐free filtrates from cultures of Verticillium albo‐atrum and dilute solutions of substances of high molecular weight have been studied. There was no difference between the effect of these solutions on resistant and on susceptible plants. Freezing and heating decreased the effect of culture filtrates in reducing water loss and causing wilt. Solutions of pectic substances as dilute as 30 p.p.m. induced wilting and were 30 times as effective as solutions of certain polysaccharides in reducing water loss. Filtrates from pectate cultures had a very high polygalacturonase activity and when diluted up to 250 times induced typical disease symptoms in leaves of cut shoots in 70 hr.; this property was lost on autoclaving. No difference was found in the composition of xylem exudates from resistant and susceptible plants. Filtrates from cultures on a synthetic plant‐sap medium to which insoluble plant material from resistant and from susceptible plants had been added were found to have different effects on cut shoots; this may depend on the different polygalacturonase activities of these filtrates. Studies on water loss from shoot‐inoculated resistant and susceptible plants showed that the water loss/fresh weight was reduced to almost the same extent in resistant and susceptible shoots, despite the fact that resistant plants developed only mild symptoms of disease. Resistant plants were found to be more drought‐resistant than susceptible plants.
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Claims 12
Claim · model-written summary
Filtrate and polymer solutions had no differential effect on resistant and susceptible plants.
- Taxon
- tomato plants
Solanum lycopersicumt0 - Outcome
- no difference between the effect of these solutionse0
- Direction
- no differencee0
- Comparator
- resistant and on susceptible plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference between the effect of these solutions on resistant and on susceptible plants.”
t0“tomato plants”
Claim · model-written summary
Freezing and heating decreased filtrate effects on water loss and wilt.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Freezing and heatinge0
- Outcome
- effect of culture filtrates in reducing water loss and causing wilte0
- Direction
- decreasede0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Freezing and heating decreased the effect of culture filtrates in reducing water loss and causing wilt.”
t0“tomato plants”
Claim · model-written summary
Pectic solutions as dilute as 30 p.p.m. induced wilting.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Solutions of pectic substances as dilute as 30 p.p.m.e0
- Outcome
- wiltinge0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Solutions of pectic substances as dilute as 30 p.p.m. induced wilting and were 30 times as effective as solutions of certain polysaccharides in reducing water loss.”
t0“tomato plants”
Claim · model-written summary
Pectic solutions were 30 times as effective as polysaccharides in reducing water loss.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Solutions of pectic substancese0
- Outcome
- water losse0
- Direction
- reducinge0
- Value
- 30 timese0
- Comparator
- solutions of certain polysaccharidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Solutions of pectic substances as dilute as 30 p.p.m. induced wilting and were 30 times as effective as solutions of certain polysaccharides in reducing water loss.”
t0“tomato plants”
Claim · model-written summary
Pectate culture filtrates had very high polygalacturonase activity.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Gene
- polygalacturonasee0
- Outcome
- polygalacturonase activitye0
- Direction
- very highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Filtrates from pectate cultures had a very high polygalacturonase activity”
t0“tomato plants”
Claim · model-written summary
Filtrates diluted up to 250 times induced leaf disease symptoms within 70 hr.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Organ / stage
- leaves of cut shootse0
- Treatment
- diluted up to 250 timese0
- Outcome
- typical disease symptoms in leaves of cut shootse0
- Value
- 70 hr.e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when diluted up to 250 times induced typical disease symptoms in leaves of cut shoots in 70 hr.; this property was lost on autoclaving.”
t0“tomato plants”
Claim · model-written summary
Autoclaving removed the symptom-inducing property of filtrates.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- autoclavinge0
- Outcome
- this property was loste0
- Direction
- loste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this property was lost on autoclaving.”
t0“tomato plants”
Claim · model-written summary
Xylem exudate composition did not differ between resistant and susceptible plants.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Outcome
- composition of xylem exudatese0
- Direction
- No differencee0
- Comparator
- resistant and susceptible plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No difference was found in the composition of xylem exudates from resistant and susceptible plants.”
t0“tomato plants”
Claim · model-written summary
Filtrates cultured with resistant versus susceptible plant material affected cut shoots differently.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- insoluble plant material from resistante0
- Outcome
- different effects on cut shootse0
- Qualifier
- different polygalacturonase activities of these filtratese0
- Comparator
- from susceptible plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Filtrates from cultures on a synthetic plant‐sap medium to which insoluble plant material from resistant and from susceptible plants had been added were found to have different effects on cut shoots; this may depend on the different polygalacturonase activities of these filtrates.”
t0“tomato plants”
Claim · model-written summary
Shoot inoculation similarly reduced water loss per fresh weight in resistant and susceptible plants.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Outcome
- water loss/fresh weighte0
- Direction
- reducede0
- Comparator
- resistant and susceptible shootse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water loss/fresh weight was reduced to almost the same extent in resistant and susceptible shoots”
t0“tomato plants”
Claim · model-written summary
Resistant plants developed only mild disease symptoms.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Material
- resistant plantse0
- Outcome
- mild symptoms of diseasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resistant plants developed only mild symptoms of disease”
t0“tomato plants”
Claim · model-written summary
Resistant tomato plants were more drought resistant than susceptible plants.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Material
- Resistant plantse0
- Outcome
- drought‐resistante0
- Direction
- moree0
- Comparator
- susceptible plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistant plants were found to be more drought‐resistant than susceptible plants.”
t0“tomato plants”
The same questions in other papers
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See all 6 papers →heat · physiology: water · Solanum lycopersicum (tomato)Positive and negative results
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See all 7 papers →cold · physiology: water · Solanum lycopersicum (tomato)Results agree
3 papers in the same direction as this paper
- negative
- negative
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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.