Abstract
BACKGROUND: Bacterial leaf blight and leaf streak are the two most damaging bacterial diseases of rice. However, few bactericidal chemicals are available for controlling both diseases. The antibacterial properties of two kinds of chitosan with different molecular weights and degrees of N-deacetylation and their effect on rice bacterial leaf blight and leaf streak were evaluated. RESULTS: Results showed that the two kinds of chitosan solution possess a strong antibacterial activity against both rice bacterial pathogens and significantly reduced disease incidence and severity by comparison with the control under greenhouse conditions. However, the interaction between chitosan and rice pathogens was affected by the type and concentration of chitosan, the bacterial species and the contact time between chitosan and bacteria. The direct antibacterial activity of chitosan may be attributed to both membrane lysis and the destruction of biofilm. In addition, both chitosan solutions significantly increased the activities of phenylalanine ammonia lyase, peroxidase and polyphenol oxidase in rice seedlings following inoculation of two rice pathogens by comparison with the control. CONCLUSION: The role of chitosan in protection of rice against bacterial pathogens has been shown to involve direct antibacterial activity and indirect induced resistance.
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Claims 7
Claim · model-written summary
Both chitosan solutions showed strong antibacterial activity against rice bacterial pathogens.
- Taxon
- rice
Oryza sativat0 - Treatment
- two kinds of chitosan solutione0
- Interactor
- rice bacterial pathogense0pathogen
- Outcome
- antibacterial activity against both rice bacterial pathogense0
- Direction
- stronge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“the two kinds of chitosan solution possess a strong antibacterial activity against both rice bacterial pathogens”
Claim · model-written summary
Both chitosan solutions significantly reduced rice disease incidence versus control in a greenhouse.
- Taxon
- riceOryza sativat0
- Treatment
- chitosane1
- Outcome
- disease incidencee0
- Direction
- reducede0
- Comparator
- the controle0
- Setting
- greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“significantly reduced disease incidence and severity by comparison with the control under greenhouse conditions”
e1“the two kinds of chitosan solution possess a strong antibacterial activity against both rice bacterial pathogens”
Claim · model-written summary
Both chitosan solutions significantly reduced rice disease severity versus control in a greenhouse.
- Taxon
- riceOryza sativat0
- Treatment
- chitosane1
- Outcome
- disease incidence and severitye0
- Direction
- reducede0
- Comparator
- the controle0
- Setting
- greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“significantly reduced disease incidence and severity by comparison with the control under greenhouse conditions”
e1“the two kinds of chitosan solution possess a strong antibacterial activity against both rice bacterial pathogens”
Claim · model-written summary
Chitosan-pathogen interaction varied with chitosan type, concentration, bacterial species and contact time.
- Taxon
- riceOryza sativat0
- Treatment
- chitosane0
- Interactor
- rice pathogense0pathogen
- Outcome
- interaction between chitosan and rice pathogense0
- Qualifier
- type and concentration of chitosan, the bacterial species and the contact timee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“the interaction between chitosan and rice pathogens was affected by the type and concentration of chitosan, the bacterial species and the contact time between chitosan and bacteria”
Claim · model-written summary
Direct antibacterial activity may be attributable to membrane lysis and biofilm destruction.
- Taxon
- riceOryza sativat0
- Treatment
- chitosane0
- Outcome
- direct antibacterial activitye0
- Qualifier
- membrane lysis and the destruction of biofilme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“The direct antibacterial activity of chitosan may be attributed to both membrane lysis and the destruction of biofilm”
Claim · model-written summary
Both chitosan solutions significantly increased phenylalanine ammonia lyase, peroxidase and polyphenol oxidase activities in pathogen-inoculated rice seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- both chitosan solutionse0
- Interactor
- rice pathogense0pathogen
- Outcome
- activities of phenylalanine ammonia lyase, peroxidase and polyphenol oxidasee0
- Direction
- increasede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“both chitosan solutions significantly increased the activities of phenylalanine ammonia lyase, peroxidase and polyphenol oxidase in rice seedlings following inoculation of two rice pathogens by comparison with the control”
Claim · model-written summary
The authors attributed chitosan protection to direct antibacterial action and induced resistance.
- Taxon
- riceOryza sativat0
- Treatment
- chitosane0
- Interactor
- bacterial pathogense0pathogen
- Outcome
- protection of rice against bacterial pathogense0
- Qualifier
- direct antibacterial activity and indirect induced resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“The role of chitosan in protection of rice against bacterial pathogens has been shown to involve direct antibacterial activity and indirect induced resistance”
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See all 11 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.