Detecção de Pyricularia grisea em sementes de cevada produzidas em sistema irrigado por pivô central no Cerrado Brasileiro

Goulart, Augusto P.; Amabili, Renato F.; Nasser, Luiz Carlos Bhering; Freitas, Marcos Augusto de

doi:10.1590/s0100-41582003000500019

Cited by 11 publications

(12 citation statements)

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“…Finally, this study has also shown that the P. oryzae pathotype Triticum has a host range wider than wheat, barley, rye and oat (Igarashi et al 1986, Urashima et al 1993, Anjos et al 1996, Goulart et al 2003). …”

Section: Resultssupporting

confidence: 54%

“…Although ear infection is the most destructive form of wheat blast disease (Goulart & Paiva 2000, Torres et al 2009), little is known about the origins of the initial inoculum source. It is plausible that the initial inoculum of the pathogen produced in the leaves of invasive grasses has an important epidemiological role in the incidence of wheat blast on ears.…”

Section: Resultsmentioning

confidence: 99%

“…), rye (Secale cereal), barley (Hordeum vulgare), maize (Zea mays) and wheat (Triticum aestivum) (Bailey & Eijnatten 1961, Igarashi et al 1986, Urashima et al 1993 ABSTRACT RESUMO al. 1996, Couch & Kohn 2002, Goulart et al 2003, Couch et al 2005, Marchi et al 2005. The adoption of the Pyricularia oryzae designation as the species associated with blast disease is recent.…”

Section: Introductionmentioning

confidence: 99%

“…Since it was first reported in 1985, in the Paraná State (Igarashi et al 1986, Goulart et al 2007), blast disease on wheat ears has become a very important disease, causing crop losses of 40-100 % (Goulart & Paiva 2000, Torres et al 2009). Due to the lack of varieties with high levels of genetic resistance and efficient chemical control to manage the disease, the pathogen has become widely distributed in all wheat growing fields in Brazil (Maciel et al 2013, Castroagudín et al 2014.…”

Section: Introductionmentioning

confidence: 99%

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Pyricularia pennisetigena and P. zingibericola from invasive grasses infect signal grass, barley and wheat

Reges

Negrisoli

Dorigan

et al. 2016

Pesqui. Agropecu. Trop.

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Fungal species from the Pyricularia genus are associated with blast disease in plants from the Poaceae family, causing losses in economically important crops such as rice, oat, rye, barley, wheat and triticale. This study aimed at characterizing the pathogenicity spectrum of P. pennisetigena and P. zingibericola to signal grass, barley and wheat, as well as comparing them with those from the species P. grisea and P. oryzae pathotype Triticum, which occur widely in the Brazilian agroecosystem. Twenty isolates of Pyricularia spp. were obtained from infected leaf samples of invasive plant species from wheat fields. The isolates classification into distinct Pyricularia species was done using molecular phylogeny based on actin and calmodulin genes. Pyricularia pennisetigena and P. zingibericola inoculated on plant leaves, at a concentration adjusted to 105 conidia mL-1, were pathogenic to signal grass, barley and wheat, with varying levels of aggressiveness.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyricularia pennisetigena and P. zingibericola from invasive grasses infect signal grass, barley and wheat

Reges

Negrisoli

Dorigan

et al. 2016

Pesqui. Agropecu. Trop.

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“…The impact of the new disease on barley could be inferred later when a 30% reduction in grain weight was recorded (Lima & Minella, ). A survey of blast disease on 35 barley seed lots produced under central pivot irrigation verified 71.4% of incidence, with an average infestation of 10.2%, in spite of seeds with no visual symptoms and regular size (Goulart, Amabile, Nasser, & Freitas, ).…”

Section: Introductionmentioning

confidence: 99%

Host range, mating type and population structure of Magnaporthe sp. of a single barley field in São Paulo state, Brazil

Urashima

Alves

Silva

et al. 2017

Journal of Phytopathology

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Brazil is blast disease hot spot because severe epidemics have occurred among wheat, triticale, rye, barley and oat crops. Although the first outbreak of barley blast appeared in 1998, little information is available. Therefore, this study aimed to examine host range, mating type composition and population structure of Magnaporthe sp. from a single barley field in São Paulo, Brazil. To examine pathogenicity, 25 Magnaporthe isolates were inoculated on five, three, two and two cultivars of barley, wheat, oat and rice, respectively, and one cultivar each of rye, corn, sorghum, triticale and certain weeds (Cenchrus echinatus, Setaria geniculata, Brachiaria plantaginea and Eleusine indica). Mating type distribution of 33 isolates was investigated by molecular tools. The genotypic divergence of 41 barley and five wheat isolates was investigated by 15 random amplified polymorphic DNA primers and unweighted pair group method with arithmetic mean. The host range of the barley blast pathogen included wheat, oat, rye and triticale but not rice and weeds. Sexual reproduction appeared to not be involved in the high genotypic diversity because only a single isolate, MAT1‐2, was identified. The majority of barley isolates clustered together with wheat blast, except for four, suggesting a different origin.

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Wheat blast disease: danger on the move

Cruz

Valent

2017

Trop. plant pathol.

211

214

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Wheat blast is caused by the fungus Magnaporthe oryzae Triticum pathotype (MoT). The potential for wheat blast to cause widespread losses demands immediate action to understand and manage this explosive disease. The recent appearance of wheat blast in Bangladesh demonstrates the threat of global spread, which could occur via the movement of infected seed or grain. MoT mainly infects wheat heads, with symptoms closely resembling Fusarium head blight. To date, wheat blast is considered an intractable and dangerous disease and fungicides have shown limited efficacy. Disease management requires identification of new resistance sources and a complete understanding of MoT ecology and wheat blast epidemiology. Understanding the full potential for pathogen variability, including any role for sexual reproduction in the field, is critical. A small number of pathogen avirulence (AVR) genes block other host-adapted M. oryzae pathotypes from infecting wheat; so potential AVR gene mutations leading to new host jumps remain a threat. Indeed, some strains of the closely related Lolium pathotype, causing gray leaf spot of turf grasses, already infect wheat. This review provides the current status of wheat blast research and disease control strategies indicating similarities and differences to rice blast and gray leaf spot. Critical knowledge gaps are discussed.

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Detecção de Pyricularia grisea em sementes de cevada produzidas em sistema irrigado por pivô central no Cerrado Brasileiro

Abstract: Detection of Pyricularia grisea on barley seeds produced under central pivot irrigation in the Brazilian Cerrado Occurrence of Pyricularia grisea on barley (Hordeum vulgare) seeds produced under central pivot irrigation is reported for the first time in the Brazilian Cerrado, DF, Brazil.

Cited by 11 publications

References 0 publications

Pyricularia pennisetigena and P. zingibericola from invasive grasses infect signal grass, barley and wheat

Pyricularia pennisetigena and P. zingibericola from invasive grasses infect signal grass, barley and wheat

Host range, mating type and population structure of Magnaporthe sp. of a single barley field in São Paulo state, Brazil

Wheat blast disease: danger on the move

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