Abstract
Summary The in vitro and in vivo fungicidal activity of chitosan was studied against Colletotrichum gloeosporioides , the causal agent of anthracnose in papaya fruits. Chitosan at 1.5% and 2.0% concentrations showed a fungistatic effect with 90–100% inhibition (significant at P ≤ 0.05) of the fungal mycelial growth. Changes in the conidial morphology were also observed with the higher chitosan concentrations after 7‐ h incubation. In vivo studies showed that 1.5% and 2.0% chitosan coatings on papaya not only controlled the fruit decay but also delayed the onset of disease symptoms by 3–4 weeks during 5 weeks storage at 12 ± 1 °C and slowed down the subsequent disease development. However, when leaving the fruits to ripen at ambient temperature (28 ± 2 °C), 2.0% chitosan was less effective than 1.5% in controlling the disease development. Chitosan coatings also delayed the ripening process by maintaining the firmness levels, soluble solids concentration and titratable acidity values during and after storage.
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Claims 7
Claim · model-written summary
At 1.5%, chitosan inhibited fungal mycelial growth by 90–100%.
- Taxon
- papaya fruits
_-_DPLA_-_55200ec009622d7d42349f3583df310e.jpg?width=60)
Carica papayae1 - Treatment
- Chitosan at 1.5%e0
- Interactor
- Colletotrichum gloeosporioides
Colletotrichum gloeosporioidese2pathogen - Outcome
- fungal mycelial growthe0
- Direction
- inhibitione0
- Value
- 90–100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_DPLA_-_55200ec009622d7d42349f3583df310e.jpg?width=500)
Verbatim
e0“Chitosan at 1.5% and 2.0% concentrations showed a fungistatic effect with 90–100% inhibition (significant at P ≤ 0.05) of the fungal mycelial growth.”
e1“papaya fruits”
e2“Colletotrichum gloeosporioides”
Claim · model-written summary
At 2.0%, chitosan inhibited fungal mycelial growth by 90–100%.
- Taxon
- papaya fruitsCarica papayae1
- Treatment
- 2.0% concentrationse0
- Interactor
- Colletotrichum gloeosporioidesColletotrichum gloeosporioidese2pathogen
- Outcome
- fungal mycelial growthe0
- Direction
- inhibitione0
- Value
- 90–100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chitosan at 1.5% and 2.0% concentrations showed a fungistatic effect with 90–100% inhibition (significant at P ≤ 0.05) of the fungal mycelial growth.”
e1“papaya fruits”
e2“Colletotrichum gloeosporioides”
Claim · model-written summary
Higher chitosan concentrations changed conidial morphology after seven hours.
- Taxon
- papaya fruitsCarica papayae1
- Treatment
- higher chitosan concentrationse0
- Interactor
- Colletotrichum gloeosporioidesColletotrichum gloeosporioidese2pathogen
- Outcome
- conidial morphologye0
- Qualifier
- after 7‐ h incubatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in the conidial morphology were also observed with the higher chitosan concentrations after 7‐ h incubation.”
e1“papaya fruits”
e2“Colletotrichum gloeosporioides”
Claim · model-written summary
At 1.5%, chitosan coating controlled papaya fruit decay and delayed symptoms by 3–4 weeks.
- Taxon
- papayaCarica papayae0
- Treatment
- 1.5%e0
- Interactor
- Colletotrichum gloeosporioidesColletotrichum gloeosporioidese1pathogen
- Outcome
- onset of disease symptomse0
- Direction
- delayede0
- Value
- 3–4 weekse0
- Qualifier
- during 5 weeks storage at 12 ± 1 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1.5% and 2.0% chitosan coatings on papaya not only controlled the fruit decay but also delayed the onset of disease symptoms by 3–4 weeks during 5 weeks storage at 12 ± 1 °C”
e1“Colletotrichum gloeosporioides”
Claim · model-written summary
At 2.0%, chitosan coating delayed papaya disease symptoms by 3–4 weeks.
- Taxon
- papayaCarica papayae0
- Treatment
- 2.0% chitosan coatingse0
- Interactor
- Colletotrichum gloeosporioidesColletotrichum gloeosporioidese1pathogen
- Outcome
- onset of disease symptomse0
- Direction
- delayede0
- Value
- 3–4 weekse0
- Qualifier
- during 5 weeks storage at 12 ± 1 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1.5% and 2.0% chitosan coatings on papaya not only controlled the fruit decay but also delayed the onset of disease symptoms by 3–4 weeks during 5 weeks storage at 12 ± 1 °C”
e1“Colletotrichum gloeosporioides”
Claim · model-written summary
At ambient ripening temperature, 2.0% chitosan controlled papaya disease less effectively than 1.5%.
- Taxon
- papayaCarica papayae1
- Treatment
- 2.0% chitosane0
- Interactor
- Colletotrichum gloeosporioidesColletotrichum gloeosporioidese2pathogen
- Outcome
- controlling the disease developmente0
- Direction
- less effectivee0
- Qualifier
- ambient temperature (28 ± 2 °C)e0
- Comparator
- 1.5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when leaving the fruits to ripen at ambient temperature (28 ± 2 °C), 2.0% chitosan was less effective than 1.5% in controlling the disease development.”
e1“anthracnose in papaya fruits”
e2“Colletotrichum gloeosporioides”
Claim · model-written summary
Chitosan coatings delayed papaya ripening while maintaining firmness, soluble solids and titratable acidity.
- Taxon
- papayaCarica papayae1
- Treatment
- Chitosan coatingse0
- Outcome
- ripening processe0
- Direction
- delayede0
- Qualifier
- during and after storagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chitosan coatings also delayed the ripening process by maintaining the firmness levels, soluble solids concentration and titratable acidity values during and after storage.”
e1“anthracnose in papaya fruits”
The same questions in other papers
chitosan · quality: postharvest · Carica papaya (papaya)Positive and negative results
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See all 18 papers →chitosan · Colletotrichum gloeosporioides · Carica papaya (papaya)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.