Doenças do milho causadas por fungos do gênero Stenocarpella

Casa, Ricardo Trezzi; Reis, Erlei Melo; Zambolim, Laércio

doi:10.1590/s0100-41582006000500001

Cited by 37 publications

(25 citation statements)

References 29 publications

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“…In relation to V8 + VT, taking into consideration the grain rot characteristic, there was a higher percentage for hybrids P 32R48H and DKB 390PRO (belonging to group 2) ( Table 1). According to Casa, Reis, and Zambolim (2006), the fungus Stenocarpella spp. is mainly associated with grain rot, and it may be the principal agent of grain rot in maize, which may have occurred in this research.…”

Section: Methodsmentioning

confidence: 99%

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

et al. 2017

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ABSTRACT. This study was carried out with the objective of evaluating the effect of fungicide application on grain rot in commercial maize hybrids and the relation between grain rot and the expression of lipoxygenase enzyme in grain in conventional row spacing of 0.70 m and reduced row spacing of 0.45 m. Treatments were made in a 3 x 8 factorial scheme, using three forms of management with fungicide (Trifloxystrobin + Prothioconazole) and eight maize hybrids divided into two groups (tolerant and susceptible) with three repetitions, totaling 72 plots in each environment (conventional and reduced spacing) in the 2013/2014 crop. The following characteristics were evaluated: grain rot percentage and lipoxygenase enzyme expression (LOX) in the grain. The hybrid and the fungicide utilized influenced the grain rot percentage. Grain rot percentage was reduced by the use of the fungicide, and the highest reduction was in susceptible hybrids with two applications, V8 and V8+VT. There was higher expression of LOX enzyme in maize hybrids that belong to the group tolerant of fungi that cause grain rot .The use of the fungicide in two applications, V8 (eight leaves) and VT (tasseling), increased the intensity of the LOX enzyme, which was more evident for the reduced spacing. Efeito de fungicida foliar e espaçamento de plantas na expressão da enzima lipoxigenase e podridão de grãos em híbridos de milho RESUMO. O objetivo deste trabalho foi avaliar o efeito da aplicação de fungicida sobre a podridão de grãos em híbridos comerciais de milho e a relação entre os grãos ardidos e a expressão da enzima lipoxigenase no grão, em espaçamento convencional de 0,70 m e reduzido de 0,45 m. Os tratamentos foram no esquema fatorial 3 x 8, com três formas de manejo com fungicida (Trifloxistrobina + Protioconazol) e oito híbridos de milho, sendo divididos em dois grupos (tolerantes e suscetíveis), com três repetições, totalizando 72 parcelas em cada ambiente (espaçamento convencional e reduzido), na safra agrícola 2013/2014. As seguintes caractrísticas foram avaliadas: porcentagem de grãos ardidos e expressão da enzima lipoxigenase (LOX) nos grãos. O fungicida reduziu a incidência de grãos ardidos, e a maior redução ocorreu nos híbridos suscetíveis, com duas aplicações, V8 e V8+VT. Houve maior expressão da enzima LOX em híbridos de milho pertencentes ao grupo tolerante aos fungos causadores de grãos ardidos. A aplicação do fungicida em duas aplicações, V8 (oito folhas) e VT (pendoamento), aumentou a intensidade da enzima LOX, mais evidente no espaçamento reduzido.Palavras-chave: LOX, podridão de espigas, controle químico, espaçamento reduzido, Zea mays.

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Section: Methodsmentioning

confidence: 99%

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

et al. 2017

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“…Sacc. and Stenocarpella macrospora, Earle, are important pathogens of maize, causing root, stem and ear rots in addition to seedling collapse and necrotic leaf spot (Casa et al, 2006). In Brazil, these diseases are present in all maize growing areas, where they may cause severe reduction in yields and grain quality, besides producing mycotoxins, which are an important concern worldwide (Eddins,1930;Dorrance et al, 1998).…”

mentioning

confidence: 99%

“…the Stenocarpella species are necrotrophic, with a parasitic phase in the live tissues of the host and a saprophytic phase in the crop residue (Casa et al, 2003;Casa et al, 2006). As such, they can form pycnidia in the crop residue and may survive inside the seeds, which are important sources of primary inoculum (Casa et al, 1998), as a dormant mycelium.…”

mentioning

confidence: 99%

Sensibility of the PCR technique in the detection of Stenocarpella sp. associated with maize seeds

Barrocas

Machado

Almeida

et al. 2012

Rev. bras. sementes

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-Maize seeds, infected by Stenocarpella species, are important sources of inoculum for the introduction and dissemination of stalk and ear rot and macrospore leaf spot diseases. the use of healthy seeds is an important strategy for the preventive control of these diseases. However, one of the difficulties in the health quality control programs for maize seeds is the availability of a reliable and quick method for detecting these fungi during routine seed analyses. Therefore, the objective of the present study was to investigate the possibility of using the PCR technique as an alternative method for accurately detecting these pathogens in maize seed samples. Maize seeds were kept in contact with S. maydis colonie developed in PDA media containing mannitol at -1.4 MPa for 72 h. the seed samples used in this study were prepared with infected seeds at incidences of 100, 20, 10, 2, 1 and zero %.the primers used were able to detect S. maydis fungi in association with seeds with a maximum of 2% , however those primers were not able to differentiate between the two species.Index terns: fungus, molecular detection, stalk and ear rot, macrospore leaf spot.Sensibilidade da técnica PCR na detecção de Stenocarpella sp. associados às sementes de milho RESuMo -Sementes de milho infectadas por Stenocarpella são importantes fontes de inóculo para a introdução e disseminação da podridão do colmo e da espiga e mancha foliar de macrospora em campos de produção. o uso de sementes sadias constitui uma importante estratégia para o controle preventivo dessas doenças. A disponibilidade de métodos rápidos para a detecção desses fungos em análises de rotina é uma das dificuldades em programas de controle de qualidade de sementes de milho, já que o método utilizado demanda longo tempo e sua identificação é bastante subjetiva. o objetivo desse trabalho foi investigar o uso da técnica PCR para a detecção desses patógenos em sementes de milho. Para isto sementes de milho inoculadas com S. maydis foram misturadas a sementes sadias de modo que formassem lotes com incidências de 100, 20, 10, 2, 1 e zero%. o par de primers utilizado para detectar S. maydis foi capaz de detectar o máximo de 2% de incidência, todavia os primers não foram suficientes para diferenciar as duas espécies.termos para indexação: fungo, detecção molecular, podridão do colmo e da espiga, mancha foliar de macrospora.

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“…The increase in maize cultivation in the no-tillage system, the lack of crop rotation and succession, and favorable climatic conditions are among the most relevant causes of the high incidence of pathogens that cause ear rot (Casa et al, 2006), such as Fusarium verticillioides, Fusarium graminiareaum, Gibberella zeae, Diplodia maydis, and Diplodia macrospora. Among them, F. verticillioides stands out from the other fungi that cause ear rot due to its wide occurrence throughout the world and because it produces mycotoxins of the fumonisin group (van Egmond et al, 2007;Reid et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Research Article Selection of maize inbred lines and gene expression for resistance to ear rot.

Pereira

Pinho

et al. 2017

Genet. Mol. Res.

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Doenças do milho causadas por fungos do gênero Stenocarpella

Cited by 37 publications

References 29 publications

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

Sensibility of the PCR technique in the detection of Stenocarpella sp. associated with maize seeds

Research Article Selection of maize inbred lines and gene expression for resistance to ear rot.

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