Abstract
Tobacco etch is one of the most widespread and injurious viruses on burley tobacco in Ontario. Three strains of this virus were obtained from tobacco collections. Their symptoms and behavior on tobacco and other hosts are described. Tobacco varieties were divided into two groups on the basis of their reaction to the etch virus. The group comprising all burley varieties tested showed severe symptoms while the other, comprising flue cured, dark, and cigar varieties, developed mild symptoms. The F 1 from severe-symptom varieties × mild-symptom varieties exhibit mild symptoms while the F 2 has segregated into severe- and mild-symptom types. The widespread occurrence of etch is attributed to the prevalence on tobacco of the vector Myzus persicae. A mixture of potato virus X (ringspot strain) and etch causes a more severe disease on burley tobacco than either virus by itself.
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Claims 5
Claim · model-written summary
Burley varieties showed severe etch symptoms.
Not reportedTaxon
Verbatim
e0“The group comprising all burley varieties tested showed severe symptoms”
Claim · model-written summary
Flue cured, dark and cigar varieties had mild symptoms.
Not reportedTaxon
Verbatim
e0“the other, comprising flue cured, dark, and cigar varieties, developed mild symptoms”
Claim · model-written summary
F1 offspring showed mild symptoms.
Not reportedTaxon
Verbatim
e0“The F 1 from severe-symptom varieties × mild-symptom varieties exhibit mild symptoms”
Claim · model-written summary
F2 offspring segregated into severe and mild symptoms.
Not reportedTaxon
Verbatim
e0“the F 2 has segregated into severe- and mild-symptom types”
Claim · model-written summary
Etch and potato virus X together caused more severe disease than either alone.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- A mixture of potato virus X (ringspot strain) and etche0
- Outcome
- disease on burley tobaccoe0
- Direction
- more severee0
- Comparator
- either virus by itselfe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mixture of potato virus X (ringspot strain) and etch causes a more severe disease on burley tobacco than either virus by itself.”
The same questions in other papers
Solanum tuberosum · organism · Nicotiana tabacum (tobacco)Positive and negative results
1 in the opposite direction
- 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.