Abstract
Chitosan with an initial molecular weight (Mw) of approximately 193 kDa was degraded into about 11.4 and 14.8 kDa by γ -ray irradiation of the solution containing 5% chitosan in 0.2 M acetic acid at 75 kGy and the solution of 5% chitosan in 0.2 M acetic acid supplemented with 1% H 2 O 2 at 10 kGy, respectively. The synergistic degraded chitosan sample with Mw ~14.8 kDa was separated into 5 fractions by using ultrafiltration membranes. The analysis results from UV, FTIR, and NMR spectra indicated that the combined treatment of low irradiation dose and low H 2 O 2 concentration did not cause any change in the molecular structure of degraded chitosan fractions. Separated chitosan fractions with Mw > 1 kDa inhibited the growth of Colletotrichum capsici in vitro . While all separated chitosan fractions remarkably enhanced fresh biomass (11–56%) and chlorophyll content (20–92%) of capsicum seedlings. In the field test, the treatment with oligochitosan fractions with Mw in a range of 1–3 kDa (F 2 ) to 3–10 kDa (F 3 ) gained 9.0–11.4% of the fruit yield and reduced 64.8–67.2% of the rate of anthracnose disease outbreak fruits caused by C. capsici . Thus, the F 2 and F 3 fractions in degraded chitosan product are the key fractions for the enhancement of both the growth promotion effect and defense respond activity against the infection of pathogenic Colletotrichum fungi causing anthracnose disease in capsicum.
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Claims 5
Claim · model-written summary
Chitosan fractions above 1 kDa inhibited Colletotrichum capsici growth in vitro.
- Treatment
- chitosan fractions with Mw > 1 kDae0
- Interactor
- Colletotrichum capsiciColletotrichum truncatume0pathogen
- Outcome
- growth of Colletotrichum capsicie0
- Direction
- inhibitede0
CapsicumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Separated chitosan fractions with Mw > 1 kDa inhibited the growth of Colletotrichum capsici in vitro .”
t0“on Capsicum”
Claim · model-written summary
Separated chitosan fractions enhanced fresh biomass of capsicum seedlings by 11–56%.
- Organ / stage
- seedlingse0
- Treatment
- separated chitosan fractionse0
- Outcome
- fresh biomasse0
- Direction
- enhancede0
- Value
- 11–56%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all separated chitosan fractions remarkably enhanced fresh biomass (11–56%) and chlorophyll content (20–92%) of capsicum seedlings”
Claim · model-written summary
Separated chitosan fractions enhanced chlorophyll content of capsicum seedlings by 20–92%.
- Organ / stage
- seedlingse0
- Treatment
- separated chitosan fractionse0
- Outcome
- chlorophyll contente0
- Direction
- enhancede0
- Value
- 20–92%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all separated chitosan fractions remarkably enhanced fresh biomass (11–56%) and chlorophyll content (20–92%) of capsicum seedlings”
Claim · model-written summary
F2 and F3 oligochitosan fractions increased field fruit yield by 9.0–11.4%.
- Treatment
- oligochitosan fractions with Mw in a range of 1–3 kDa (F 2 ) to 3–10 kDa (F 3 )e0
- Outcome
- fruit yielde0
- Direction
- gainede0
- Value
- 9.0–11.4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment with oligochitosan fractions with Mw in a range of 1–3 kDa (F 2 ) to 3–10 kDa (F 3 ) gained 9.0–11.4% of the fruit yield”
t0“on Capsicum”
Claim · model-written summary
F2 and F3 oligochitosan fractions reduced anthracnose outbreak fruit rate by 64.8–67.2%.
- Treatment
- oligochitosan fractions with Mw in a range of 1–3 kDa (F 2 ) to 3–10 kDa (F 3 )e0
- Interactor
- C. capsiciColletotrichum truncatume0pathogen
- Outcome
- rate of anthracnose disease outbreak fruitse0
- Direction
- reducede0
- Value
- 64.8–67.2%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment with oligochitosan fractions with Mw in a range of 1–3 kDa (F 2 ) to 3–10 kDa (F 3 ) gained 9.0–11.4% of the fruit yield and reduced 64.8–67.2% of the rate of anthracnose disease outbreak fruits caused by C. capsici”
t0“on Capsicum”
The same questions in other papers
chitosan · physiology: pigments · Capsicum (peppers)Results differ
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
chitosan · growth · Capsicum (peppers)Results agree
8 papers in the same direction as this paper
- positive
- positive
- positive
5 papers more in this group
See all 9 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.