Abstract
BACKGROUND: One promising area of rice disease management is the potential of exploiting biological control agents. Rice seedling rot disease caused by soil-borne pathogenic fungi has become a dominant disease problem because of greater use of direct seeding. Rice hull has been potentially used to control paddy weeds, but little information is available on rice disease. This study was conducted to investigate the relationships between disease incidence and soil amended with tricin-releasing rice hull, and to assess fungicidal activity of tricin and its synthesised aurone isomer, with an attempt to develop an allelochemical-based fungicide against rice seedling rot disease. RESULTS: Tricin was detected in all hulls of 12 rice cultivars tested, but its contents in rice hulls varied greatly with the cultivar and genotype. Tricin in rice hulls was released into the soil once amended. Disease incidence was significantly reduced by soil amended with rice hull. Tricin-rich rice hull amendment greatly suppressed soil-borne pathogenic fungi Fusarium oxysporum Schlecht. and Rhizoctonia solani Kühn which cause rice seedling rot disease. In attempting to obtain enough tricin for further experiments, the aurone isomer (5,7,4'-trihydroxy-3',5'-dimethoxyaurone) of tricin rather than tricin itself was unexpectedly synthesised. This aurone isomer had much stronger fungicidal activity on both F. oxysporum and R. solani than tricin itself. CONCLUSION: Soil amended with tricin-rich rice hull was associated with reduced risk of developing seedling rot disease. The tricin isomer, aurone, is more effective against rice seedling rot disease than tricin itself, making it an ideal lead compound for new fungicide discovery.
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Claims 9
Claim · model-written summary
Tricin was found in hulls of all 12 rice cultivars tested.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- hullse0
- Outcome
- Tricin was detectede0
- Value
- 12 rice cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tricin was detected in all hulls of 12 rice cultivars tested”
Claim · model-written summary
Tricin content in rice hulls varied greatly by cultivar and genotype.
- Taxon
- riceOryza sativat0
- Material
- cultivar and genotypee0
- Outcome
- contents in rice hullse0
- Direction
- varied greatlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its contents in rice hulls varied greatly with the cultivar and genotype”
t0“rice hull and its aurone isomer against rice seedling rot disease”
Claim · model-written summary
Tricin was released from rice hulls into amended soil.
- Taxon
- riceOryza sativae0
- Organ / stage
- rice hullse0
- Outcome
- Tricin in rice hulls was released into the soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tricin in rice hulls was released into the soil once amended”
Claim · model-written summary
Rice hull soil amendment significantly reduced disease incidence.
- Taxon
- riceOryza sativat0
- Treatment
- soil amended with rice hulle0
- Outcome
- Disease incidencee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease incidence was significantly reduced by soil amended with rice hull”
t0“rice hull and its aurone isomer against rice seedling rot disease”
Claim · model-written summary
Tricin-rich rice hull amendment suppressed Fusarium oxysporum.
- Taxon
- riceOryza sativae0
- Treatment
- Tricin-rich rice hull amendmente0
- Interactor
- Fusarium oxysporum Schlecht.
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=60)
Fusarium oxysporume0pathogen - Outcome
- Fusarium oxysporum Schlecht.e0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_(Fusarium_oxysporum_f.sp._batatas)_1234227-PPT-Clemson_University.jpg?width=500)
Verbatim
e0“Tricin-rich rice hull amendment greatly suppressed soil-borne pathogenic fungi Fusarium oxysporum Schlecht. and Rhizoctonia solani Kühn which cause rice seedling rot disease”
Claim · model-written summary
Tricin-rich rice hull amendment suppressed Rhizoctonia solani.
- Taxon
- riceOryza sativae0
- Treatment
- Tricin-rich rice hull amendmente0
- Interactor
- Rhizoctonia solani Kühn
Rhizoctonia solanie0pathogen - Outcome
- Rhizoctonia solani Kühne0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tricin-rich rice hull amendment greatly suppressed soil-borne pathogenic fungi Fusarium oxysporum Schlecht. and Rhizoctonia solani Kühn which cause rice seedling rot disease”
Claim · model-written summary
The aurone isomer had stronger fungicidal activity against F. oxysporum than tricin.
- Taxon
- riceOryza sativat0
- Treatment
- aurone isomere0
- Interactor
- F. oxysporumFusarium oxysporume0pathogen
- Outcome
- fungicidal activity on both F. oxysporum and R. solanie0
- Direction
- much strongere0
- Comparator
- tricin itselfe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This aurone isomer had much stronger fungicidal activity on both F. oxysporum and R. solani than tricin itself”
t0“rice hull and its aurone isomer against rice seedling rot disease”
Claim · model-written summary
The aurone isomer had stronger fungicidal activity against R. solani than tricin.
- Taxon
- riceOryza sativat0
- Treatment
- aurone isomere0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Outcome
- fungicidal activity on both F. oxysporum and R. solanie0
- Direction
- much strongere0
- Comparator
- tricin itselfe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This aurone isomer had much stronger fungicidal activity on both F. oxysporum and R. solani than tricin itself”
t0“rice hull and its aurone isomer against rice seedling rot disease”
Claim · model-written summary
Authors identify aurone as a lead compound for fungicide discovery against rice seedling rot.
- Taxon
- riceOryza sativae0
- Outcome
- ideal lead compound for new fungicide discoverye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tricin isomer, aurone, is more effective against rice seedling rot disease than tricin itself, making it an ideal lead compound for new fungicide discovery”
The same questions in other papers
other · Rhizoctonia solani · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.