Abstract
The nematicidal activity of four molecular weights (2.27 Ă 105, 3.60 Ă 105, 5.97 Ă 105, and 9.47 Ă 105 g/mol) of a biopolymer chitosan was assayed against the root-knot nematode, Meloidogyne incognita, in vitro and in pot experiments. In laboratory assays, the nematode mortality was significantly influenced by exposure times and chitosan molecular weight. Low molecular weight chitosan (2.27 Ă 105 g/mol) was the most effective in killing the nematode with EC50 of 283.47 and 124.90 mg/l after 24 and 48 h of treatment, respectively. In a greenhouse bioassay, all the compounds mixed in soil at one- and five-fold concentrations of the LC50 value significantly reduced population, egg mass, and root galling of tomato seedlings compared with the untreated control. In general, the nematicidal activity of these compounds was increased dramatically with a decrease in the molecular weight. The results suggest that the chitosan at low molecular weight may serve as a natural nematicide
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Claims 7
Claim · model-written summary
Nematode mortality depended significantly on exposure time and chitosan molecular weight.
- Taxon
- tomato seedlings
Solanum lycopersicume1 - Treatment
- chitosan molecular weighte0
- Outcome
- nematode mortalitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nematode mortality was significantly influenced by exposure times and chitosan molecular weight”
e1“tomato seedlings”
Claim · model-written summary
Low molecular weight chitosan had an EC50 of 283.47 mg/l after 24 h.
- Taxon
- tomato seedlingsSolanum lycopersicume1
- Treatment
- Low molecular weight chitosan (2.27 Ă 105 g/mol)e0
- Interactor
- Meloidogyne incognita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae2pest - Outcome
- killing the nematodee0
- Direction
- most effectivee0
- Value
- 283.47e0
- Qualifier
- 24e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=500)
Verbatim
e0“Low molecular weight chitosan (2.27 Ă 105 g/mol) was the most effective in killing the nematode with EC50 of 283.47 and 124.90 mg/l after 24 and 48 h of treatment, respectively.”
e1“tomato seedlings”
e2“Meloidogyne incognita”
Claim · model-written summary
Low molecular weight chitosan had an EC50 of 124.90 mg/l after 48 h.
- Taxon
- tomato seedlingsSolanum lycopersicume1
- Treatment
- Low molecular weight chitosan (2.27 Ă 105 g/mol)e0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae2pest
- Outcome
- killing the nematodee0
- Direction
- most effectivee0
- Value
- 124.90 mg/le0
- Qualifier
- 48 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low molecular weight chitosan (2.27 Ă 105 g/mol) was the most effective in killing the nematode with EC50 of 283.47 and 124.90 mg/l after 24 and 48 h of treatment, respectively.”
e1“tomato seedlings”
e2“Meloidogyne incognita”
Claim · model-written summary
Soil-applied chitosan significantly reduced nematode population and egg mass on tomato seedlings.
- Taxon
- tomato seedlingsSolanum lycopersicume0
- Treatment
- all the compounds mixed in soil at one- and five-fold concentrations of the LC50 valuee0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae1pest
- Outcome
- population, egg masse0
- Direction
- reducede0
- Comparator
- untreated controle0
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a greenhouse bioassay, all the compounds mixed in soil at one- and five-fold concentrations of the LC50 value significantly reduced population, egg mass, and root galling of tomato seedlings compared with the untreated control.”
e1“Meloidogyne incognita”
Claim · model-written summary
Soil-applied chitosan significantly reduced tomato root galling.
- Taxon
- tomato seedlingsSolanum lycopersicume0
- Treatment
- all the compounds mixed in soil at one- and five-fold concentrations of the LC50 valuee0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae1pest
- Outcome
- root gallinge0
- Direction
- reducede0
- Comparator
- untreated controle0
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a greenhouse bioassay, all the compounds mixed in soil at one- and five-fold concentrations of the LC50 value significantly reduced population, egg mass, and root galling of tomato seedlings compared with the untreated control.”
e1“Meloidogyne incognita”
Claim · model-written summary
Nematicidal activity increased as chitosan molecular weight decreased.
- Taxon
- tomato seedlingsSolanum lycopersicume1
- Treatment
- molecular weighte0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae2pest
- Outcome
- nematicidal activitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, the nematicidal activity of these compounds was increased dramatically with a decrease in the molecular weight.”
e1“tomato seedlings”
e2“Meloidogyne incognita”
Claim · model-written summary
The authors suggest low molecular weight chitosan as a natural nematicide.
- Taxon
- tomato seedlingsSolanum lycopersicume1
- Outcome
- chitosan at low molecular weight may serve as a natural nematicidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chitosan at low molecular weight may serve as a natural nematicide”
e1“tomato seedlings”
The same questions in other papers
chitosan · Meloidogyne incognita · Solanum lycopersicum (tomato)Results agree
5 papers in the same direction as this paper
- 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.