Publications by authors named "Marcelo A Carmona"

Article Synopsis
  • The study focuses on a destructive pathogen of wheat known as tan spot, caused by an ascomycete fungus, which has a highly variable genome influenced by the gain and loss of effector genes.
  • Researchers analyzed allelic variations in a specific chlorosis-encoding gene across 422 isolates from different regions and pathotypes, constructing a haplotype network to understand its evolutionary relationships.
  • Key findings include discovering a retrotransposon that disrupts gene function, identifying numerous mutations, and recognizing ToxB-like proteins in various other species, implying historical horizontal gene transfer during the evolution of these genes.
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Background: Net blotch (NB), caused by Pyrenophora teres f. teres (Ptt), is an important disease of barley worldwide. NB control is commonly achieved through the use of fungicide mixtures including strobilurins, triazoles and carboxamides.

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is a perennial vining plant species native to South America. It was introduced into many countries for ornamental and medicinal purposes as well as for its edible fruits, but it has become highly invasive, generating severe environmental problems. Biological control using bioherbicides and natural compounds is an interesting control option.

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A bioactive disubstituted nonenolide, named truncatenolide, was produced by , which was collected from infected tissues of soybean showing anthracnose symptoms in Argentina. This is a devastating disease that drastically reduces the yield of soybean production in the world. The fungus also produced a new trisubstituted oct-2-en-4-one, named truncatenone, and the well-known tyrosol and acetyltyramine.

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Two new penta- and tetrasubstituted cyclopentenones, named phaseocyclopentenones A and B ( and ), together with guignardone A (), were isolated from cultures. The phytopathogenic fungus was isolated from infected soybean tissues showing charcoal rot symptoms in Argentina. Charcoal rot is a devastating disease considering that soybean is one of the main legumes cultivated in the world.

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Background: Use of fungicide seed treatments for control of soybean soilborne diseases such as Pythium damping-off has increased worldwide. However, emergence of Pythium strains resistant to metalaxyl-M has prompted the need for alternative technologies to fungicides for damping-off control. The use of phosphites (Phis) has been proposed as a method to control oomycetes, but their use as seed treatments in soybean is limited by the lack of information on their efficacy.

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The aim of this study was to evaluate in vitro the mycelial susceptibility of Trichoconiella padwickii to different active ingredients through average median concentration IC calculation. Inoculum disks were seeded on bean agar at different concentrations (0.1; 1; 10; 30, 50; 100 and 1000mg/l) of various fungicides.

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