Pyricularia grisea: novo patógeno em Brachiaria brizantha cv. Marandu no Pará

Verzignassi, J. R.; Poltronieri, L. S.; Benchimol, R. L.; França, Sueny Kelly Santos de; Carvalho, Eudes de Arruda; Fernandes, C. D.

doi:10.1590/s0100-54052012000300016

Cited by 12 publications

(10 citation statements)

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“…in central-western and southern Brazil (Lima & Minella 2003, Verzignassi et al 2012). Wheat blast was first reported in Paraná State, Brazil in 1985 (Igarashi et al 1986, Anjos et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Pyricularia graminis-tritici, a new Pyricularia species causing wheat blast

Castroagudín¹,

Moreira²,

Pereira³

et al. 2016

persoonia

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Pyricularia oryzae is a species complex that causes blast disease on more than 50 species of poaceous plants. Pyricularia oryzae has a worldwide distribution as a rice pathogen and in the last 30 years emerged as an important wheat pathogen in southern Brazil. We conducted phylogenetic analyses using 10 housekeeping loci for 128 isolates of P. oryzae sampled from sympatric populations of wheat, rice, and grasses growing in or near wheat fields. Phylogenetic analyses grouped the isolates into three major clades. Clade 1 comprised isolates associated only with rice and corresponds to the previously described rice blast pathogen P. oryzae pathotype Oryza (PoO). Clade 2 comprised isolates associated almost exclusively with wheat and corresponds to the previously described wheat blast pathogen P. oryzae pathotype Triticum (PoT). Clade 3 contained isolates obtained from wheat as well as other Poaceae hosts. We found that Clade 3 is distinct from P. oryzae and represents a new species, Pyricularia graminis-tritici (Pgt). No morphological differences were observed among these species, but a distinctive pathogenicity spectrum was observed. Pgt and PoT were pathogenic and highly aggressive on Triticum aestivum (wheat), Hordeum vulgare (barley), Urochloa brizantha (signal grass), and Avena sativa (oats). PoO was highly virulent on the original rice host (Oryza sativa), and also on wheat, barley, and oats, but not on signal grass. We conclude that blast disease on wheat and its associated Poaceae hosts in Brazil is caused by multiple Pyricularia species. Pyricularia graminis-tritici was recently found causing wheat blast in Bangladesh. This indicates that P. graminis-tritici represents a serious threat to wheat cultivation globally.

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Section: Introductionmentioning

confidence: 99%

Pyricularia graminis-tritici, a new Pyricularia species causing wheat blast

Castroagudín¹,

Moreira²,

Pereira³

et al. 2016

persoonia

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“…Mostly used in pasture in the Middle West and North regions, which are the largest producers of cattle in the country, grasses and legumes have been affected by fungal diseases, such as Brachiaria brizantha (Pyricularia grisea) (Verzignassi et al, 2012) and Pythium periilum (Rhizoctonia solani) (Duarte et al, 2007), while Panicum maximum and Stylosanthes spp. have been affected by Bipolaris sp., Curvularia sp and Phoma sp.…”

Section: Introductionmentioning

confidence: 99%

Sanitary analysis, transmission and pathogenicity of fungi associated with forage plant seeds in tropical regions of Brazil

et al. 2014

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-Brazil is a major producer and exporter of beef in the world, 90% of the production is made in pasture and 85% of cultivated pastures in the country are Brachiaria sp. With a growing livestock industry in the recent years, several forage plant diseases became significant importance for causing losses in pasture productivity and quality. This study aims at quantifying the species of fungi associated with seeds and their frequency in forage plants from tropical regions of Brazil. Assays were performed considering: incidence, pathogenicity and seed-seedling transmission of fungi associated with seeds. Therefore, 28 lots of forage species seeds produced in the harvest of 2010-2011 were used. Fourteen genera of fungi associated with seeds were found, among which Bipolaris sp., Phoma sp., and Curvularia sp. had pathogenic potential. It was possible to note that Bipolaris sp., is prejudicial to forage seedlings of Brachiaria, Panicum and Crotalaria. Bipolaris sp. and Curvularia sp. have an average of seed-seedling transmission of 100% and 90%, respectively.

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“…The occurrence of Fusarium sp., in association with poor management, has contributed to the death of several 'Marandu' grass pasture areas of the Amazon region (VERZIGNASSI et al, 2012) as well as pastures in the states of Pará, Acre, Maranhão, and Rondonia (DUARTE et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…The only report mentioning the occurrence of this pathogen in samples of seeds of 'Marandu' grass in Brazil refers to a lot produced in Rondon do Pará, a county of the state of Pará, of the Northern region of Brazil (VERZIGNASSI et al, 2012) and this fact is thought to be an indication that this pathogen is being disseminated throughout the Brazilian territory.…”

Section: Resultsmentioning

confidence: 99%