Abstract
A collection of Gaeumannomyces graminis var. graminis isolates obtained from symptomatic rice and grass plants in central and northern Brazil were studied in regard to pathogenicity on rice and cultural characteristics. For all isolates, only one type of lobed hyphopodia was observed both in the field and artificially inoculated plants. Perithecia were formed on artificial media and inoculated leaf sheaths. Hyphopodia were formed from ascosporic germ tubes. The hyphae under moist stress conditions produced dark brown chlamydospores that were initially hyaline. Large variation in the number of chlamydospores produced and duration of perithecia formation was observed among the isolates. Pathogenicity assays showed that 60-day old rice plants were more susceptible than 35-day old plants. The isolates from rice and grasses varied significantly in regard to disease severity on both rice seedlings and adult rice plants. In general, the isolates from rice were more aggressive than the isolates from grasses. Spontaneous infection of rice plants by ascosporic inoculum from perithecia on rice stubbles was observed in the greenhouse, suggesting their role as a source of primary inoculum in the field, which deserves further investigation.
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Claims 6
Claim · model-written summary
All isolates formed one lobed hyphopodial type in field and inoculated rice plants.
- Taxon
- rice
Oryza sativat0 - Interactor
- isolatese0pathogen
- Outcome
- only one type of lobed hyphopodiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For all isolates, only one type of lobed hyphopodia was observed both in the field and artificially inoculated plants.”
t0“crown sheath rot of rice”
Claim · model-written summary
Perithecia formed on inoculated rice leaf sheaths.
- Taxon
- riceOryza sativat0
- Organ / stage
- leaf sheathse0
- Interactor
- Gaeumannomyces graminis var. graminis
Gaeumannomyces graminist0pathogene0 - Outcome
- Perithecia were formede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Perithecia were formed on artificial media and inoculated leaf sheaths.”
t0“Gaeumannomyces graminis var. graminis isolates from rice”
Claim · model-written summary
Rice plants aged 60 days were more susceptible than plants aged 35 days.
- Taxon
- riceOryza sativae0
- Organ / stage
- 60-day old rice plantse0
- Interactor
- Gaeumannomyces graminis var. graminisGaeumannomyces graminist0pathogene0
- Outcome
- susceptiblee0
- Direction
- more susceptiblee0
- Comparator
- 35-day old plantse0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pathogenicity assays showed that 60-day old rice plants were more susceptible than 35-day old plants.”
t0“Gaeumannomyces graminis var. graminis isolates from rice”
Claim · model-written summary
Rice and grass isolates differed significantly in disease severity on rice seedlings and adults.
- Taxon
- riceOryza sativae0
- Interactor
- isolates from rice and grassese0pathogen
- Outcome
- disease severitye0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The isolates from rice and grasses varied significantly in regard to disease severity on both rice seedlings and adult rice plants.”
t0“Gaeumannomyces graminis var. graminis isolates from rice”
Claim · model-written summary
Rice isolates were generally more aggressive than grass isolates on rice.
- Taxon
- riceOryza sativat0
- Interactor
- isolates from ricee0pathogen
- Outcome
- aggressivee0
- Direction
- more aggressivee0
- Comparator
- isolates from grassese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, the isolates from rice were more aggressive than the isolates from grasses.”
t0“crown sheath rot of rice”
Claim · model-written summary
Rice plants were spontaneously infected by ascospores from perithecia on rice stubble in a greenhouse.
- Taxon
- riceOryza sativae0
- Interactor
- ascosporic inoculume0pathogen
- Outcome
- Spontaneous infectione0
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spontaneous infection of rice plants by ascosporic inoculum from perithecia on rice stubbles was observed in the greenhouse”