Abstract
This report describes a bacteria-free culture unit to be used in large numbers for detailed analysis of host-parasite relationships of Meloidogyne sp. The unit consists of an excised tomato root growing in agar medium in a test tube to which one nematode larva has been added. Almost every nematode which penetrates induces a gall; a high proportion of these galls have eggs externally after 3 weeks of incubation at 28° C. Galls appear from the 1st to the 9th day, eggs from the 18th to the 26th day, and larvae from the 25th to the 32nd day after inoculation. Infectivity of Meloidogyne incognita acrita was 53%. Variations in nutrient composition had no marked effects except that high potassium stimulated egg production without affecting incidence of gall formation; high concentrations of iodine increased brown discoloration of galls. Addition of juice from a resistant plant (Cornus florida) depressed the infectivity of M. incognita acrita for tomato roots. A resistant variety of tomato, Nemared, maintained its resistance to Meloidogyne in excised root culture.
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Claims 11
Claim · model-written summary
Most penetrating nematodes induced galls.
- Outcome
- induces a galle0
Not reportedTaxon
Verbatim
e0“Almost every nematode which penetrates induces a gall”
Claim · model-written summary
Many galls bore external eggs after three weeks.
Not reportedTaxon
Verbatim
e0“a high proportion of these galls have eggs externally after 3 weeks of incubation at 28° C”
Claim · model-written summary
Galls appeared on days 1 through 9.
Not reportedTaxon
Verbatim
e0“Galls appear from the 1st to the 9th day”
Claim · model-written summary
Eggs appeared on days 18 through 26.
Not reportedTaxon
Verbatim
e0“eggs from the 18th to the 26th day”
Claim · model-written summary
Larvae appeared on days 25 through 32.
Not reportedTaxon
Verbatim
e0“larvae from the 25th to the 32nd day after inoculation”
Claim · model-written summary
Meloidogyne incognita acrita infectivity was 53%.
- Interactor
- Meloidogyne incognita acrita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae0pathogen - Outcome
- Infectivity of Meloidogyne incognita acritae0
- Value
- 53%e0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=500)
Verbatim
e0“Infectivity of Meloidogyne incognita acrita was 53%”
Claim · model-written summary
High potassium stimulated nematode egg production.
Not reportedTaxonComparator
Verbatim
e0“high potassium stimulated egg production without affecting incidence of gall formation”
Claim · model-written summary
High potassium did not affect gall formation incidence.
Not reportedTaxonComparator
Verbatim
e0“high potassium stimulated egg production without affecting incidence of gall formation”
Claim · model-written summary
High iodine increased brown gall discoloration.
Not reportedTaxonComparator
Verbatim
e0“high concentrations of iodine increased brown discoloration of galls”
Claim · model-written summary
Cornus florida juice reduced M. incognita acrita infectivity on tomato roots.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- juice from a resistant plant (Cornus florida)e0
- Interactor
- M. incognita acritaMeloidogyne incognitae0pathogen
- Outcome
- infectivity of M. incognita acritae0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of juice from a resistant plant (Cornus florida) depressed the infectivity of M. incognita acrita for tomato roots”
Claim · model-written summary
Nemared retained resistance in excised root culture.
- Taxon
- tomatoSolanum lycopersicume0
- Material
- Nemarede0
- Interactor
- MeloidogyneMeloidogynee0pathogen
- Outcome
- resistance to Meloidogynee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A resistant variety of tomato, Nemared, maintained its resistance to Meloidogyne in excised root culture”
The same questions in other papers
diiodine · pest · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- negative
potassium · disease · Solanum lycopersicum (tomato)Positive and negative results
3 papers in the same direction as this paper · 15 in the opposite direction
- positive
- positive
- positive
15 papers more in this group
See all 19 papers →potassium · pest · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- no effect
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.