Abstract
BACKGROUND: Fusarium oxysporum f. sp. cucumerinum and Rhizoctonia solani AG-4 are the two most important fungal pathogens causing soil-borne fungal diseases of cucumber; they are difficult to control and cause serious economic losses. Given the detrimental effects of the indiscriminate use of chemical fungicides, biocontrol emerges as an efficient and ecofriendly alternative for managing soil-borne fungal diseases. RESULTS: Streptomyces lydicus JCK-6019 (hereafter, JCK-6019) was isolated from rhizosphere soil. Its fermentation filtrate and volatile organic compounds exhibited broad-spectrum antifungal activity against various phytopathogenic fungi and oomycetes. JCK-6019 produced natamycin as an agar-diffusible antifungal metabolite. It also produced indole-3-acetic acid and various hydrolytic enzymes. In vivo experiments revealed that a ten-fold-diluted optimized JCK-6019 fermentation broth exhibited 100% control efficiency against cucumber damping-off disease and 62.5% control efficiency against cucumber Fusarium wilt disease. Pretreatment of cucumber seedlings with 1000-fold-diluted optimized JCK-6019 fermentation broth resulted in 68.18% and 23.91% disease control values against cucumber damping-off and Fusarium wilt disease, respectively. Moreover, peroxidase activity in cucumbers after 1 day of treatment was 1.5-fold higher than that in the control. Similarly, polyphenol oxidase activity in cucumbers after 3 days of treatment was 2.34-fold higher than that in the control, indicating that JCK-6019 can induce plant resistance. CONCLUSION: The natamycin-producing strain JCK-6019 could effectively suppress the development of cucumber Fusarium wilt and damping-off disease by inducing plant resistance and producing antifungal metabolites, including natamycin and volatile organic compounds. Thus, JCK-6019 possesses high potential for application in the development of biocontrol agents against soil-borne fungal diseases of cucumber. © 2024 Society of Chemical Industry.
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Claims 11
Claim · model-written summary
JCK-6019 filtrate and volatile compounds had broad antifungal activity.
- Taxon
- cucumber
Cucumis sativust0 - Interactor
- phytopathogenic fungi and oomycetese0pathogen
- Outcome
- broad-spectrum antifungal activity against various phytopathogenic fungi and oomycetese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Its fermentation filtrate and volatile organic compounds exhibited broad-spectrum antifungal activity against various phytopathogenic fungi and oomycetes.”
t0“cucumber”
Claim · model-written summary
JCK-6019 produced natamycin.
- Taxon
- cucumberCucumis sativust0
- Outcome
- natamycin as an agar-diffusible antifungal metabolitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JCK-6019 produced natamycin as an agar-diffusible antifungal metabolite.”
t0“cucumber”
Claim · model-written summary
JCK-6019 produced indole-3-acetic acid and hydrolytic enzymes.
- Taxon
- cucumberCucumis sativust0
- Outcome
- indole-3-acetic acid and various hydrolytic enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also produced indole-3-acetic acid and various hydrolytic enzymes.”
t0“cucumber”
Claim · model-written summary
Ten-fold-diluted broth controlled cucumber damping-off with 100% efficiency.
- Taxon
- cucumberCucumis sativust0
- Treatment
- a ten-fold-diluted optimized JCK-6019 fermentation brothe0
- Interactor
- JCK-6019e0biocontrol_agent
- Outcome
- control efficiency against cucumber damping-off diseasee0
- Value
- 100%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a ten-fold-diluted optimized JCK-6019 fermentation broth exhibited 100% control efficiency against cucumber damping-off disease”
t0“cucumber”
Claim · model-written summary
The same broth controlled cucumber Fusarium wilt with 62.5% efficiency.
- Taxon
- cucumberCucumis sativust0
- Treatment
- a ten-fold-diluted optimized JCK-6019 fermentation brothe0
- Interactor
- JCK-6019e0biocontrol_agent
- Outcome
- control efficiency against cucumber Fusarium wilt diseasee0
- Value
- 62.5%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a ten-fold-diluted optimized JCK-6019 fermentation broth exhibited 100% control efficiency against cucumber damping-off disease and 62.5% control efficiency against cucumber Fusarium wilt disease”
t0“cucumber”
Claim · model-written summary
Seedling pretreatment produced 68.18% control of damping-off.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Pretreatment of cucumber seedlings with 1000-fold-diluted optimized JCK-6019 fermentation brothe0
- Interactor
- JCK-6019e0biocontrol_agent
- Outcome
- disease control values against cucumber damping-offe0
- Value
- 68.18%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of cucumber seedlings with 1000-fold-diluted optimized JCK-6019 fermentation broth resulted in 68.18% and 23.91% disease control values against cucumber damping-off and Fusarium wilt disease, respectively.”
Claim · model-written summary
Seedling pretreatment produced 23.91% control of Fusarium wilt.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Pretreatment of cucumber seedlings with 1000-fold-diluted optimized JCK-6019 fermentation brothe0
- Interactor
- JCK-6019e0biocontrol_agent
- Outcome
- disease control values against cucumber damping-off and Fusarium wilt diseasee0
- Value
- 23.91%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of cucumber seedlings with 1000-fold-diluted optimized JCK-6019 fermentation broth resulted in 68.18% and 23.91% disease control values against cucumber damping-off and Fusarium wilt disease, respectively.”
Claim · model-written summary
Peroxidase activity in treated cucumbers was 1.5-fold higher after one day.
- Taxon
- cucumbersCucumis sativuse0
- Treatment
- treatmente0
- Gene
- peroxidasee0
- Outcome
- peroxidase activitye0
- Direction
- highere0
- Value
- 1.5-folde0
- Qualifier
- after 1 daye0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“peroxidase activity in cucumbers after 1 day of treatment was 1.5-fold higher than that in the control.”
t0“JCK‐6019”
Claim · model-written summary
Polyphenol oxidase activity in treated cucumbers was 2.34-fold higher after three days.
- Taxon
- cucumbersCucumis sativuse0
- Treatment
- treatmente0
- Gene
- polyphenol oxidasee0
- Outcome
- polyphenol oxidase activitye0
- Direction
- highere0
- Value
- 2.34-folde0
- Qualifier
- after 3 dayse0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“polyphenol oxidase activity in cucumbers after 3 days of treatment was 2.34-fold higher than that in the control”
Claim · model-written summary
The authors infer that JCK-6019 suppresses disease by inducing plant resistance and producing antifungal metabolites.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- JCK-6019e0
- Interactor
- JCK-6019e0biocontrol_agent
- Outcome
- suppress the development of cucumber Fusarium wilt and damping-off diseasee0
- Qualifier
- inducing plant resistance and producing antifungal metabolitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The natamycin-producing strain JCK-6019 could effectively suppress the development of cucumber Fusarium wilt and damping-off disease by inducing plant resistance and producing antifungal metabolites, including natamycin and volatile organic compounds.”
Claim · model-written summary
The authors propose JCK-6019 for cucumber fungal disease biocontrol development.
- Taxon
- cucumberCucumis sativuse0
- Interactor
- JCK-6019e0biocontrol_agent
- Outcome
- application in the development of biocontrol agents against soil-borne fungal diseases of cucumbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JCK-6019 possesses high potential for application in the development of biocontrol agents against soil-borne fungal diseases of cucumber.”
The same questions in other papers
processing · disease · Cucumis sativus (cucumber)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
7 papers more in this group
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.