Resistance to Magnaporthe Grisea Among Brazilian Wheat Genotypes

Prestes, A. M.; Arendt, P. F.; Fernandes, J. M. C.; Scheeren, P. L.

doi:10.1007/1-4020-5497-1_16

Cited by 25 publications

(19 citation statements)

References 3 publications

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“…This variability in the reaction to blast disease among wheat cultivars and lines has also been reported in other studies (Goulart et al, 2007;Prestes et al, 2007). Under controlled conditions, no cultivar was resistant to all tested isolates of P. oryzae, but cultivars did have different degrees of resistance to pathogen inoculation (Urashima et al, 2004;Prestes et al, 2007). In the present study, the highest DIs in season 1 -0.625, 0.651, and 0.685, respectively (Table 3) -were observed for the CD 108 cultivar and the EP063053 and EP066066 lines.…”

Section: Resultssupporting

confidence: 51%

“…The genotypes with high TGWs (EP064026, EP063030, EP066055, and EP063044) were included in the group of genotypes with high yields and low DIs, being considered the most tolerant to blast. This variability in the reaction to blast disease among wheat cultivars and lines has also been reported in other studies (Goulart et al, 2007;Prestes et al, 2007). Under controlled conditions, no cultivar was resistant to all tested isolates of P. oryzae, but cultivars did have different degrees of resistance to pathogen inoculation (Urashima et al, 2004;Prestes et al, 2007).…”

Section: Resultssupporting

confidence: 51%

“…In experiments with 72 isolates of P. oryzae and 20 wheat varieties, BR-18 Terena was the only one that showed broad-spectrum resistance (Urashima et al, 2004). Furthermore, under controlled conditions, spikes from different wheat genotypes showed variable reaction to blast (Arruda et al, 2005;Prestes et al, 2007). It should also be noted that, for the wheat producing regions in which blast frequently occurs, most of the cultivars currently recommended are susceptible to the pathogen under field conditions.…”

Section: Introductionmentioning

confidence: 99%

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Sowing date reduces the incidence of wheat blast disease

Coelho

Torres

Cecon

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to assess the effect of sowing date on the intensity of wheat blast disease, as well as the yield losses caused by this disease in different wheat (Triticum aestivum) genotypes. The experiments were conducted in 2013 at the Sertãozinho experimental station of Empresa de Pesquisa Agropecuária de Minas Gerais (Epamig), in the municipality of Patos de Minas, in the state of Minas Gerais, Brazil. Fourteen wheat genotypes and two sowing dates were evaluated. The experimental design was a randomized complete block with three replicates. The evaluated variables were: incidence, severity, thousand grain weight (TGW), grain yield, and yield losses. A disease index (DI) was calculated, based both on the incidence and the severity of the disease, to measure blast intensity in wheat. The sowing date significantly affected DI, TGW, and grain yield. Significant linear correlations were observed between DI and yield losses (0.89), between losses and TGW (-0.85), and between losses and grain yield (-0.93). For wheat blast, DIs greater than or equal to 0.5 indicate potential yield losses equal to or greater than 70%. The EP063030 line and the MGS Brilhante and BRS 264 cultivars are the most tolerant to blast, when exposed to high disease pressure.Index terms: Magnaporthe oryzae, Pyricularia oryzae, Triticum aestivum, disease index, severity, tolerance. Época de semeadura reduz a incidência da brusone do trigoResumo -O objetivo deste trabalho foi avaliar o efeito da época de semeadura sobre a intensidade da brusone, bem como as perdas na produtividade causada por essa doença em genótipos de trigo (Triticum aestivum). Os experimentos foram conduzidos, em 2013, na Fazenda Experimental de Sertãozinho da Empresa de Pesquisa Agropecuária de Minas Gerais (Epamig), em Patos de Minas, MG. Catorze genótipos de trigo e duas datas de semeadura foram avaliados. Utilizou-se o delineamento experimental de blocos ao acaso com três repetições. As variáveis avaliadas foram: incidência, severidade, peso de mil grãos (PMG), rendimento de grãos e perdas de produtividade. Calculou-se o índice da doença (ID), com base tanto na incidência quanto na severidade, para medir a intensidade da brusone em trigo. A data de semeadura afetou significativamente ID, PMG e rendimento de grãos. Houve forte correlação linear entre ID e danos (0,89), entre danos e PMG (-0,85) e entre danos e rendimento (-0,93). Para a brusone do trigo, IDs iguais ou maiores que 0,5 indicam potencial de danos de rendimento iguais ou superiores a 70%. A linhagem EP063030 e as cultivares MGS Brilhante e BRS 264 são as mais tolerantes à brusone quando expostas à alta intensidade da doença.Termos para indexação: Magnaporthe oryzae, Pyricularia oryzae, Triticum aestivum, índice da doença, severidade, tolerância.

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Section: Resultssupporting

confidence: 51%

Section: Resultssupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

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Sowing date reduces the incidence of wheat blast disease

Coelho

Torres

Cecon

et al. 2016

Pesq. agropec. bras.

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“…Genetic resistance Resistance to wheat blast remains elusive despite intense searches for sources of resistance since 1985 Prestes et al 2007;Cruz et al 2010Cruz et al , 2016c. Similar to the rice blast pathosystem, genetic studies show that wheat blast follows a gene-for-gene relationship (Flor 1971;Silué et al 1992;Anh et al 2015).…”

Section: Disease Managementmentioning

confidence: 99%

Wheat blast disease: danger on the move

Cruz

Valent

2017

Trop. plant pathol.

189

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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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“…), foi diagnosticada primeiramente no Brasil em 1985 no estado do Paraná (Igarashi et al, 1986). Desde então, pesquisas em busca de cultivares resistentes a essa doença (Urashima et al, 2004;Arruda et al, 2005;Prestes et al, 2007, Cruz et al, 2009, marcadores moleculares para a caracterização de isolados do patógeno (Brondani et al, 2000;Cruz et al, 2010) e fungicidas eficientes (Goulart et al, 1993;Urashima & Kato, 1994;Goulart et al, 1996) têm sido realizadas. Uma das maiores dificuldades em relação ao controle químico é a ineficiência dos fungicidas disponíveis no mercado devido a agressividade do patógeno ou quando o trigo é cultivado em regiões com condições climáticas favoráveis para a ocorrência de epidemias severas de brusone.…”

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Aplicação foliar de produtos na redução da severidade da brusone do trigo

Cruz¹,

Diniz

Rodrigues

et al. 2011

Trop. plant pathol.

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RESUMOEste trabalho objetivou avaliar o potencial do ácido jasmônico (AJ), quitosana desacetilada (QUI), silicato de potássio (SP), acibenzolar-S-metil (ASM), Ethefon (ET) e fosfito de potássio (FP) na redução da severidade da brusone do trigo. O fungicida tebuconazole (TE) e a água destilada (AD) foram utilizados como tratamentos controle. Plantas das cultivares BR 23, BH 1146 e BRS 208 foram pulverizadas com AJ, QUI, SP, ASM, ET, FP, TE e AD 24 h antes da inoculação com Pyricularia grisea. Avaliou-se o período de incubação (PI), a severidade e o efeito fungitóxico dos produtos no crescimento micelial de P. grisea. Para o PI, não houve diferença significativa entre os fatores cultivares e tratamentos, mas para a severidade houve interação entre esses fatores. A menor severidade da brusone para a cultivar BR 23 ocorreu com a pulverização do TE, FP e ET, os quais não diferiram estatisticamente. Para BH 1146, os tratamentos AD, QUI e ASM não diferiram estatisticamente, mas diferiram dos demais tratamentos que apresentaram menor severidade. A aplicação do TE e do FP garantiram uma menor severidade da brusone para a cultivar BRS 208. O FP propiciou uma maior redução da severidade da brusone nos dois cultivares. Os menores valores para o crescimento micelial de P. grisea ocorreram com a adição de TE e SP no meio de cultura. Os resultados desse estudo apontam para o efeito promissor do FP e do ET na potencialização da resistência do trigo à brusone, a qual mostrou ser dependente do nível de resistência basal da cultivar de trigo. Palavras-chave: Pyricularia grisea, Triticum aestivum, indução de resistência. ABSTRACT Foliar application of products on the reduction of blast severity on wheatThis study aimed to determine the potencial of jasmonic acid (JA), deacetylated chitosan (DC), potassium silicate (PS), Acibenzolar-S-Methyl (ASM), ethephon (ET), and potassium phosphate (PP) on the reduction of blast severity on wheat. The fungicide tebuconazole (TE) and distilled water (DA) were used as control treatments. Plants from the cultivars BR 23, BH 1146, and BRS 208 were sprayed with JA, DC, PS, ASM, ET, PP, TE, and DA 24 h before inoculation with Pyricularia grisea. The incubation period (IP), blast severity, and the effect of the treatments on mycelial growth of P. grisea were evaluated. For the IP, there was no significant difference among cultivars and also for the treatments, but there was interaction between these factors for severity. The lowest severity for BR 23 cultivar occurred with the spray of TE, PP, and ET, which were not significantly different among them. For BH 1146 cultivar, the treatments DA, DC, and ASM were not significantly different among them, but differed significantly from the other treatments to which were obtained the lowest severity. The spray of TE and PP gave the best reduction on severity for BRS 208 cultivar. The PP was the treatment that most reduced severity on the three cultivars tested. The lowest values for mycelial growth of P. grisea occurred upon the addition of TE and PS to the c...

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Resistance to Magnaporthe Grisea Among Brazilian Wheat Genotypes

Cited by 25 publications

References 3 publications

Sowing date reduces the incidence of wheat blast disease

Sowing date reduces the incidence of wheat blast disease

Wheat blast disease: danger on the move

Aplicação foliar de produtos na redução da severidade da brusone do trigo

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