Abstract
Foster and Ross (1968) found that when Turkish tobacco leaves inoculated with tobacco mosaic virus (TMV) were 2-5 days later immersed for 40sec. in water at 50°C, local lesions appeared 1-2 days after the heat treatment. We determined the conditions for more effectively inducing local lesions, and also compared the modes of infection and multiplication of TMV between systemic hosts and local lesion hosts. N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts, and ‘Xanthi nc’ and ‘Samsun NN’ as the local lesion hosts. When leaves of 2.5 months old plants were used, optimum treatment was for 2min. at 50°C, or for 10sec. at 55°C. Optimum incubation after the heat treatment was for 2-3 days at 25°C, or for 1-2 days at 30°C. When leaves of younger plants were used, 1min, treatment at 50°C was adequate, whereas 2min. at 50°C resulted in a visible injury of the treated leaves. In leaves of plants older than 3 months, treatments even longer than 2min. at 50°C induced no lesions at all. The number of lesions induced by heat treatment on leaves of the systemic hosts inoculated with TMV was of about the same level as on leaves of the local lesion hosts inoculated with TMV of the same concentration. There was also no significant difference in virus dilution-infectivity curves between the systemic hosts and the local lesion hosts. No significant difference was observed in the number of ectodesmata in epidermal cell walls of healthy leaves between both hosts. Local lesions on leaves of the systemic hosts induced by heat treatment 2-4 days after inoculation were much larger in size than those on leaves of the local lesion hosts on the same days after inoculation. TMV seemed to spread from each infective center more rapidly in the leaves of the systemic hosts than in those of the local lesion hosts. It is considered that the numbers of infectible sites are about equal between the local lesion hosts and the systemic hosts, but the rate of TMV multiplication after the establishment of infection is lower in the local lesion hosts than in the systemic hosts.
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Claims 11
Claim · model-written summary
Optimum heat treatment for inducing TMV local lesions was 2 min at 50°C or 10 s at 55°C on systemic-host tobacco leaves.
- Taxon
- N. tabacume0
- Interactor
- tobacco mosaic virus
Tobacco mosaic viruse1pathogen - Outcome
- optimum treatmente2
- Value
- 2min. at 50°Ce2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“optimum treatment was for 2min. at 50°C, or for 10sec. at 55°C”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
e1“leaves inoculated with tobacco mosaic virus (TMV)”
Claim · model-written summary
Optimum incubation after heat treatment was 2-3 days at 25°C or 1-2 days at 30°C.
- Taxon
- N. tabacume0
- Interactor
- tobacco mosaic virusTobacco mosaic viruse1pathogen
- Outcome
- Optimum incubation after the heat treatmente3
- Value
- 2-3 days at 25°Ce3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Optimum incubation after the heat treatment was for 2-3 days at 25°C, or for 1-2 days at 30°C”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
e1“leaves inoculated with tobacco mosaic virus (TMV)”
Claim · model-written summary
Heat treatment at 2 min and 50°C caused visible injury of the treated leaves of younger plants.
Verbatim
e4“whereas 2min. at 50°C resulted in a visible injury of the treated leaves”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
In leaves of plants older than 3 months, heat treatments longer than 2 min at 50°C induced no lesions.
Verbatim
e6“In leaves of plants older than 3 months, treatments even longer than 2min. at 50°C induced no lesions at all”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
Lesion numbers induced by heat treatment were about the same on systemic hosts and local lesion hosts inoculated with TMV at the same concentration.
- Taxon
- N. tabacume0
- Treatment
- heat treatmente7
- Interactor
- TMVTobacco mosaic viruse7pathogen
- Outcome
- number of lesionse7
- Direction
- about the same levele7
- Comparator
- local lesion hostse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The number of lesions induced by heat treatment on leaves of the systemic hosts inoculated with TMV was of about the same level as on leaves of the local lesion hosts inoculated with TMV of the same concentration”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
Virus dilution-infectivity curves did not differ significantly between systemic and local lesion hosts.
Verbatim
e1“There was also no significant difference in virus dilution-infectivity curves between the systemic hosts and the local lesion hosts”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
The number of ectodesmata in epidermal cell walls of healthy leaves did not differ significantly between systemic and local lesion hosts.
Verbatim
e1“No significant difference was observed in the number of ectodesmata in epidermal cell walls of healthy leaves between both hosts”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
Heat-induced local lesions on systemic hosts 2-4 days after inoculation were much larger than those on local lesion hosts.
Verbatim
e1“Local lesions on leaves of the systemic hosts induced by heat treatment 2-4 days after inoculation were much larger in size than those on leaves of the local lesion hosts on the same days after inoculation”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
TMV seemed to spread from each infective center more rapidly in systemic hosts than in local lesion hosts.
- Taxon
- N. tabacume0
- Interactor
- TMVTobacco mosaic viruse1pathogen
- Outcome
- spread from each infective centere1
- Direction
- more rapidlye1
- Comparator
- local lesion hostse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“TMV seemed to spread from each infective center more rapidly in the leaves of the systemic hosts than in those of the local lesion hosts”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
The rate of TMV multiplication after infection establishment is lower in local lesion hosts than in systemic hosts.
- Taxon
- N. tabacume0
- Interactor
- TMVTobacco mosaic viruse1pathogen
- Outcome
- rate of TMV multiplicatione1
- Direction
- lowere1
- Comparator
- systemic hostse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the rate of TMV multiplication after the establishment of infection is lower in the local lesion hosts than in the systemic hosts”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
Claim · model-written summary
The numbers of infectible sites are considered about equal between local lesion hosts and systemic hosts.
Verbatim
e1“It is considered that the numbers of infectible sites are about equal between the local lesion hosts and the systemic hosts”
e0“N. tabacum ‘Xanthi’and N. tabacum ‘Samsun’ were used as the systemic hosts”
The same questions in other papers
heat · Tobacco mosaic virus · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.