A5086711050- Plant Disease Resistance and Genetics
- Plant Pathogens and Fungal Diseases
- Fungal Plant Pathogen Control
- Plant-Microbe Interactions and Immunity
- Plant Pathogens and Resistance
- Mycotoxins in Agriculture and Food
- Plant and Fungal Interactions Research
- Banana Cultivation and Research
- Plant Pathogenic Bacteria Studies
- Agronomic Practices and Intercropping Systems
- Essential Oils and Antimicrobial Activity
- Fungal and yeast genetics research
- Environmental and biological studies
- Wheat and Barley Genetics and Pathology
- Plant Disease Management Techniques
- Plant tissue culture and regeneration
- Rice Cultivation and Yield Improvement
- Legume Nitrogen Fixing Symbiosis
- Entomopathogenic Microorganisms in Pest Control
- Plant Virus Research Studies
Universidade Estadual Paulista (Unesp)
2016-2024
Universidade de São Paulo
2016
ETH Zurich
2016
Abstract Fungicide resistance is an alarming challenge for the Brazilian tropical agricultural systems, with major implications food safety, human and animal health, as well environment. This review explores strategies to address fungicide within agroecosystem context. We examined historical current scenarios of in agroecosystems approaches delay emergence mitigate selection resistant variants. Our indicates that prevalence field populations key plant pathogens Brazil was due failures...
Abstract Fungicides have not been effective in controlling the wheat blast disease Brazil. An earlier analysis of 179 isolates Pyricularia oryzae Triticum lineage (PoTl) sampled from fields across six populations central‐southern Brazil during 2012 discovered a high level resistance to strobilurin fungicides. Here we analysed azole same strains based on EC 50 measurements for tebuconazole and epoxiconazole. All Brazilian PoTl exhibited both azoles, with vitro values that were at least 35...
Wheat blast, caused by the ascomycetous fungus Pyricularia oryzae Triticum lineage (PoTl), is mainly controlled fungicide use, but resistance to main groups—sterol demethylase (DMI), quinone outside (QoI), and succinate dehydrogenase inhibitors (SDHI)—has been reported in Brazil. In order rationalize inputs (e.g., choice, timing, dose-rate, spray number, mixing/alternation) for managing wheat we describe a new monitoring tool, enabling quantitative measurement of pathogen’s inoculum levels...
Abstract Wheat blast is one of the most important and devastating fungal diseases wheat in South America, South‐east Asia, now southern Africa. The disease can reduce grain yield by up to 70% best controlled using integrated management strategies. difficulty compounded lack durable host resistance ineffectiveness fungicide sprays. New succinate dehydrogenase inhibitor (SDHI) fungicides were recently introduced for diseases. Brazilian field populations pathogen Pyricularia oryzae Triticum...
Abstract Leaf blight, sheath and web blight are major diseases caused by Rhizoctonia species on both Fabaceae Poaceae plant hosts in the Brazilian Amazon agroecosystem. To determine diversity of associated with foliar fabaceous (cowpea soybean) poaceous (rice signal grass [ Urochloa brizantha ]) hosts, a broad survey was conducted Pará, Rondônia, Roraima, Mato Grosso, Amazon, from 2012 to 2013. We extended our Cerrado areas lowlands Paraíba Valley, São Paulo, where these have not been...
The fungus Rhizoctonia oryzae-sativae is an important pathogen that causes the aggregated sheath spot disease on rice. In this study, we investigated genetic structure of rice-adapted populations R. sampled from traditional rice-cropping areas Paraíba Valley, São Paulo, Brazil, and Meta, in Colombian Llanos, South America. We used five microsatellite loci to measure population differentiation infer pathogen's reproductive system. Gene flow was detected among three lowland rice Brazil...
Widespread resistance to QoIs, DMI and SDHIs fungicides has been reported for Brazilian populations of the wheat blast pathogen Pyricularia oryzae Triticum lineage (PoTl). A pre-existing mechanism not associated with target site mutations indicated DMIs SDHIs, strong indication that PoTl multidrugresistance (MDR). Therefore, main objective this study was test hypothesis SDHI detected in due efflux pump mediated MDR mechanism(s) by characterizing sensitivity antifungal substrates. Four...
Biological control is considered the only viable integrated disease management practice for controlling widely distributed and destructive foliar blight sudden death caused by fungus Rhizoctonia solani AG-1 IA on signal grass (Urochloa brizantha) pastures. Since major varieties are highly susceptible fungicide sprays not labeled pasture cropping systems, biological sought as an alternative managing this fungal disease. In study, 24 fluorescent Pseudomonas isolates obtained from naturally...
Blast is one of the most significant wheat diseases, causing high yield losses in susceptible varieties under favorable conditions Latin America, Southeastern Asia and Eastern Africa. The disease caused by ascomycetous fungal pathogen Pyricularia oryzae Triticum lineage (PoTl). Chemical control with fungicides has been used as a management strategy; however, effectiveness major classes high-risk site-specific systemic reduced due to widespread prevalence resistance, especially Brazil....
RESUMO Espécies do gênero Rhizoctonia estão associadas ao complexo de manchas da bainha arroz, sendo que R. oryzae-sativae, em particular, causa a mancha agregada bainha. Neste estudo objetivou-se determinar o potencial adaptativo duas populações oryzae-sativae à cultura milho, uma das culturas comerciais amplamente cultivadas no estado São Paulo e pode ser utilizada rotação com arroz irrigado. Não há relatos doença milho Brasil. Foram inoculados, plantas isolados determinou-se componentes...
ABSTRACT Fungi of the genus Pyricularia have a wide range host plants and are capable infecting more than 50 species grasses, causing blast disease, with damage to ears. Species forage signal grass (Urochloa spp.) can be hosts this fungus an important source inoculum pathogen for other agricultural crops affected by blast, especially wheat. The objective study was determine reaction nine cultivars Urochloa pathogens oryzae Triticum lineage (PoTl), P. pennisetigena, urashimae, grisea....
This study aimed at the development and validation of an accurate, more affordable, precise digital imaging resazurin-based fungicide sensitivity colorimetric assay (COL-assay) for fungal plant pathogens from genera Mycosphaerella Pyricularia. proposed was based on estimates resazurin reduction, which used as a metabolic indicator respiration activity microplate cultures. As model systems, we yellow black Sigatoka [Mycosphaerella musicola (Mm) M. fijiensis (Mf), respectively] wheat blast...
RESUMO Esta pesquisa propõe a utilização de um método baseado em leitor automatizado microplacas para detectar resistência fungicidas triazóis (IDM) e estrobirulinas (IQe) populações do fungo hemibiotrófico fitopatogênico Pyricularia graminis-tritici (Pygt) trigo. A disponibilidade acurado, mais rápido eficiente detecção da redução sensibilidade contribuiria facilitar tomada decisão sobre o manejo químico brusone trigo no país. Há informação controle evidências ocorrência generalizada à...
ABSTRACT Populations of the soybean leaf blight pathogen (Rhizoctonia solani AG-1 IA) are highly genetically differentiated along a latitudinal gradient in major growing regions Brazil. However, evolutionary processes leading to regional adaptation still unknown. The objective this study was evaluate relative importance neutral genetic variation and natural selection on divergence populations soybean-infecting R. IA. Therefore, we compared phenotypic differentiation quantitative traits (QST)...
RESUMO Muitos fitopatógenos de ampla distribuição geográfica como os fungos fitopatogênicos do gênero Rhizoctonia, estão sujeitos a extremas flutuações temperatura em seus habitats. Para sobreviver tais térmicas, esses organismos desenvolveram habilidade regular valores fenotípicos para adaptações térmicas bem outras variações ambientais específicas. O objetivo presente estudo foi determinar o efeito estresse térmico na evolucionabilidade crescimento micelial duas populações...
RESUMO A mancha areolada de Thanatephorus é uma das doenças mais importantes da seringueira (Hevea brasiliensis) na Amazônia. Apesar disso, questão importante sobre o real posicionamento filogenético deste patógeno ainda não foi respondida. Neste estudo, nós analisamos os padrões variação genética em seqüências região ITS-5.8S do rDNA população T. cucumeris (fase assexuada = Rhizoctonia solani AG 2-2) associado à amostrada Belém (Pará), Manaus (Amazonas) e Xapuri/Rio Branco (Acre) Amazônia,...
The genetic architecture of quantitative characters in plants can be influenced by stress due to environmental changes, combination with the decrease organism’s average performance, resulting and variances. main objective this study was determine how high-temperature affects sensitivity three populations soybean foliar blight pathogen Rhizoctonia solani AG-1 IA from Mato Grosso, Maranhão, Tocantins a broad-spectrum fungicide. specific effect on evolvability components (i.e., selection...