Erigeron bonariensis: hospedeira alternativa do Lettuce mosaic virus no Brasil

Chaves, Alexandre Levi Rodrigues; Braun, Marina Reiter; Eiras, Marcelo; Colariccio, Addolorata; Galleti, S.

doi:10.1590/s0100-41582003000300014

Cited by 12 publications

(8 citation statements)

References 7 publications

(6 reference statements)

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“…According to Agustí‐Brisach, Gramaje, León, García‐Jiménez, and Armengol () & Chaves, Braun, Eiras, Colariccio, and Galleti (), weeds can act as secondary hosts of phytopathogens, serving as potential sources of inoculum. Fuhlbohm, Ryley, and Aitken () isolated M. phaseolina from the roots of symptomless plants of 23 weed species found in Australian mung bean ( V. radiata ) fields, and all isolates were pathogenic on mung bean seedlings.…”

Section: Introductionmentioning

confidence: 99%

Identification and pathogenicity of Macrophomina species collected from weeds in melon fields in Northeastern Brazil

Negreiros

Júnior

León

et al. 2019

Journal of Phytopathology

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In this work, a collection of 94 Macrophomina isolates obtained from roots of two weed species, Trianthema portulacastrum and Boerhavia diffusa, collected during surveys conducted during 2015 and 2016 in melon production fields in Northeastern Brazil, were characterized by using molecular techniques. Phylogenetic analysis of the EF1‐α gene allowed the identification of 32 isolates as M. phaseolina and 62 isolates as M. pseudophaseolina. Results of a pathogenicity test performed on melon seedlings of the cv. “Gladial” revealed that all M. phaseolina isolates inoculated were able to cause disease to melon seedlings, but only some M. pseudophaseolina isolates were able to infect them. This study represents the first report of M. pseudophaseolina in both T. portulacastrum and B. diffusa weeds, which are prevalent in the main Brazilian melon producing and exporting regions. Information about the biology and epidemiology of M. pseudophaseolina is scarce because of its recent description; thus, further research is needed for a better understanding of this fungus as a potentially emerging pathogen of melon and other crops.

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Section: Introductionmentioning

confidence: 99%

Identification and pathogenicity of Macrophomina species collected from weeds in melon fields in Northeastern Brazil

Negreiros

Júnior

León

et al. 2019

Journal of Phytopathology

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“…Chaves et al (2003) relataram que buva (Erigeron bonariensis) pode atuar como reservatório natural do LMV e que a sua erradicação torna-se prática recomendada para o controle do vírus em áreas produtoras de alface (Lactuca sativa). Na cultura do mamão (Carica papaya), apesar do apelo agroecológico da manutenção da vegetação natural, a prá-tica da eliminação das plantas daninhas é recomendada para controle dos afídeos que transmitem o Papaya ringspot virus-P, vírus causador de uma das principais doenças da cultura.…”

Section: Resultsunclassified

“…Cerca de 15% dos vírus que afetam plantas foram descritos em associação natural com espécies da vegetação espontânea distribuídas nas famílias Asteraceae, Amaranthaceae, Chenopodiaceae, Commelinaceae, Solanaceae, Fabaceae, Malvaceae, entre outras (Chaves et al, 2003). De acordo com Costa (1998), a disseminação natural de vírus de vegetais ocorre com a eficiente participação de vetores, na grande maioria insetos homóp-teros.…”

Section: Introductionunclassified

Transmissão de begomovírus de plantas daninhas para tomateiros pela mosca-branca

Silva¹,

Santos

Nascimento³

2010

Planta daninha

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Dentre numerosas enfermidades do tomateiro (Lycopersicon esculentum), destacam-se as viroses causadas por begomovírus, os quais são transmitidos pelo vetor Bemisia tabaci biótipo B. Na Chapada da Ibiapaba-CE, os begomovírus têm sido encontrados em várias áreas onde o tomateiro é cultivado, causando sérios danos à produção. Este trabalho teve por objetivos investigar a transmissão de begomovírus a partir de tomateiros infectados para plantas daninhas e verificar seu retorno das plantas daninhas para o tomateiro. Mudas sadias de tomateiro 'Santa Clara' e das plantas daninhas bredo-de-espinho (Amaranthus spinosus), caruru-de-mancha (Amaranthus viridis), mentrasto (Ageratum conyzoides) e picão-preto (Bidens pilosa) foram submetidas à inoculação por dois métodos: com o inseto vetor e por enxertia. Após 15 dias, realizou-se a extração do DNA de amostras foliares dos tomateiros e das espécies daninhas inoculadas. A PCR realizada com oligonucleotídeos degenerados e específicos para begomovírus revelou que na transmissão com o vetor as quatro espécies de plantas daninhas foram infectadas com o begomovírus do tomateiro, enquanto que, por enxertia, apenas o picão-preto foi infectado. O retorno do vírus das plantas daninhas para o tomateiro foi também observado nos dois casos. Percentuais de 70, 50, 20 e 12,5% de transmissão para os tomateiros ocorreram quando o vetor adquiriu o vírus em mentrasto, bredo-de-espinho, picão-preto e caruru-de-mancha, respectivamente. Na enxertia, a transmissão viral para os tomateiros ocorreu apenas quando se empregaram seções de bredo-de-espinho e de picão-preto infectados. As espécies daninhas investigadas demonstraram ser hospedeiras alternativas do begomovírus de tomate da região e, em condiçõs de campo e na presença do vetor, podem constituir importantes fontes do begomovírus para a hortaliça.

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“…Spontaneous vegetation (weeds) is characterized by a high rusticity, growth in inhospitable places, aggressive habits, efficient seed dispersion by wind, high reproductive capacity, resistance to chemical control, large populations, and the occupation of large areas. In this way, these plants become potential sources of phytopathogen inoculants in commercial crops, playing a fundamental role in the epidemiology of diseases as secondary hosts (CHAVES et al, 2003).…”

Section: Commelinaceaementioning

confidence: 99%

Weeds as Potential Hosts for Fungal Root Pathogens of Watermelon

et al. 2019

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Many watermelon (Citrullus lanatus) diseases are caused by soilborne pathogens in Brazil and worldwide. The goal of this study was to identify and quantify the frequency of phytopathogenic fungi associated with watermelon root rot and vine decline that were also present in the roots of weeds in the major watermelon production regions in the state of Rio Grande do Norte, Brazil. We collected root samples from 10 of the most prevalent weed species in 16 watermelon producing areas. The plants were identified and their frequencies in the fields were calculated. The fungi found in the weed roots were isolated and the main genera associated with watermelon vine decline were identified. We identified 13 weed species belonging to nine botanical families. The weed species with the highest frequencies found in the field were Amaranthus spinosus (25.0%), Trianthema portulacastrum (18.8%), Commelina sp. (18.8%), and Boerhavia diffusa (12.5%). The fungi Macrophomina, Rhizoctonia, and Monosporascus were isolated from the roots of the weed plants. While Macrophomina was isolated from 12 different types of plants, Rhizoctonia and Monosporascus were isolated from four and two different plant species, respectively.

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Erigeron bonariensis: hospedeira alternativa do Lettuce mosaic virus no Brasil

Cited by 12 publications

References 7 publications

Identification and pathogenicity of Macrophomina species collected from weeds in melon fields in Northeastern Brazil

Identification and pathogenicity of Macrophomina species collected from weeds in melon fields in Northeastern Brazil

Transmissão de begomovírus de plantas daninhas para tomateiros pela mosca-branca

Weeds as Potential Hosts for Fungal Root Pathogens of Watermelon

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