Abstract
Lycopersicon hirsutum Dunal is very resistant to arthropod herbivory, and research on causes of resistance has often implicated trichomes and their secretions. To better understand relationships among resistance, repellency, and 2,3-dihydrofarnesoic acid, a trichome-borne sesquiterpenoid spider mite repellent, two tomato, Lycopersicon esculentum Miller, varieties were interbred with a highly resistant, spider mite repellent accession (LA1363) of L. hirsutum. Backcross and F2 generations were produced with each tomato variety. Whole leaves of 99 hybrids were bioassayed with twospotted spider mites, Tetranychus urticae Koch, allowing selection of six hybrids (two susceptible and four resistant) for each generation of each family. When these 24 hybrids were characterized for spider mite repellency with thumbtack bioassays, two hybrids had repellent leaflets, demonstrating that repellency was genetically transferred to interspecific tomato hybrids. Leaflet washes containing trichome secretions from each of three hybrids, including the two having repellent leaflets, were repellent in bridge bioassays. For the two hybrids having repellent leaflets and leaflet washes, removal of trichome secretions by dipping leaflets in methanol eliminated leaflet repellency. 2,3-Dihydrofarnesoic acid was present in trichome secretions of the hybrids having leaflet repellency, and it also was present in secretions of other hybrids, indicating that its presence is essential, but not sufficient for leaflet repellency. With regard to resistance, 16 of the hybrids tested had been identified as resistant in a whole leaf bioassay, but only two had repellent leaflets, indicating that other mechanisms of resistance are present in the resistant L. hirsutum parent.
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Claims 7
Claim · model-written summary
Two tomato hybrids had repellent leaflets, showing transferred repellency.
- Taxon
- Lycopersicon esculentum Miller
Solanum lycopersicume0 - Material
- interspecific tomato hybridse1
- Outcome
- repellent leafletse1
- Value
- two hybridse1
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“two hybrids had repellent leaflets, demonstrating that repellency was genetically transferred to interspecific tomato hybrids”
Claim · model-written summary
Leaflet washes from three hybrids repelled spider mites.
- Taxon
- Lycopersicon esculentum MillerSolanum lycopersicume0
- Material
- three hybridse1
- Outcome
- repellent in bridge bioassayse1
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“Leaflet washes containing trichome secretions from each of three hybrids, including the two having repellent leaflets, were repellent in bridge bioassays”
Claim · model-written summary
Removing trichome secretions eliminated repellency from two hybrids.
- Taxon
- Lycopersicon esculentum MillerSolanum lycopersicume0
- Material
- two hybridse1
- Treatment
- removal of trichome secretions by dipping leaflets in methanole1
- Outcome
- leaflet repellencye1
- Direction
- eliminatede1
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“For the two hybrids having repellent leaflets and leaflet washes, removal of trichome secretions by dipping leaflets in methanol eliminated leaflet repellency”
Claim · model-written summary
Repellent hybrids contained 2,3-dihydrofarnesoic acid in trichome secretions.
- Taxon
- Lycopersicon esculentum MillerSolanum lycopersicume0
- Material
- hybrids having leaflet repellencye1
- Outcome
- 2,3-Dihydrofarnesoic acid was present in trichome secretionse1
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“2,3-Dihydrofarnesoic acid was present in trichome secretions of the hybrids having leaflet repellency”
Claim · model-written summary
Other nonrepellent hybrids also contained 2,3-dihydrofarnesoic acid.
- Taxon
- Lycopersicon esculentum MillerSolanum lycopersicume0
- Material
- other hybridse1
- Outcome
- present in secretionse1
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“it also was present in secretions of other hybrids, indicating that its presence is essential, but not sufficient for leaflet repellency”
Claim · model-written summary
Sixteen hybrids were resistant in whole-leaf bioassays, but only two had repellent leaflets.
- Taxon
- Lycopersicon esculentum MillerSolanum lycopersicume0
- Material
- hybridse1
- Outcome
- resistant in a whole leaf bioassaye1
- Value
- 16e1
- Qualifier
- only two had repellent leafletse1
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“16 of the hybrids tested had been identified as resistant in a whole leaf bioassay, but only two had repellent leaflets”
Claim · model-written summary
Other resistance mechanisms are inferred in the resistant wild tomato parent.
- Taxon
- Lycopersicon esculentum MillerSolanum lycopersicume0
- Material
- L. hirsutum parente1
- Outcome
- other mechanisms of resistance are presente1
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lycopersicon esculentum Miller”
e1“indicating that other mechanisms of resistance are present in the resistant L. hirsutum parent”
The same questions in other papers
methanol · pest · Solanum lycopersicum (tomato)Positive and negative results
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- negative
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- no effect
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39 papers more in this group
See all 43 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.