Navegando por Autor "Carvalho, Bruna Martins"

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    Caracterização da reação de cultivares de feijão comum a isolados monospóricos de Fusarium oxysporum f. sp. phaseoli
    (Universidade Estadual do Norte do Paraná, 2021-08-30) Carvalho, Bruna Martins; Carvalho, Mayra Costa da Cruz Gallo de; https://orcid.org/0000-0002-1559-3828; http://lattes.cnpq.br/2844751503530944; Carvalho, Mayra Costa da Cruz Gallo de; https://orcid.org/0000-0002-1559-3828; http://lattes.cnpq.br/2844751503530944; Sauer, Aline Vanessa; https://orcid.org/0000-0003-3164-9710; http://lattes.cnpq.br/3853729166385893; Pedrinho, Denise Renata; https://orcid.org/0000-0002-8522-6126; http://lattes.cnpq.br/9613493540842437
    Fusarium wilt, a vascular disease caused by the fungus Fusarium oxysporum f. sp. phaseoli (Fop), is one of the main diseases that affect the common bean. The disease significantly reduces grain production, leading to crop yield losses. So far, the most efficient method to control the disease is the use of cultivars that contain resistance genes, or at least cultivars that are tolerant to the pathogen. However, the high variability of the fungus may pose a problem for the development of genetic improvement programs for resistance to Fusarium wilt. In this sense, the objective of the present work was to characterize the reaction to different monosporic Fop isolates, obtained from symptomatic plants collected from crops in Paraná (IPR7.8, APR1.1 and APR2.10), Minas Gerais (PMG2.6 and PMG5.9) and the isolate provided by the IAC institute (IAC9453) in different common bean cultivars. The evaluation of the isolates was carried out in 11 cultivars, being 8 commercial and 3 differentiating. The experiment was carried out in a greenhouse with inoculation of Fop isolates by immersing the roots in conidia suspension. The design used was completely randomized, with 4 replications, 11 genotypes and 6 isolates, and disease symptoms were evaluated at 7, 14, 21, 28 and 32 days after inoculation. In each evaluation, the reaction of the cultivars against the isolates was attributed based on the CIAT scale. The mean scores obtained from the 32-day evaluation after inoculation were subjected to statistical analysis from which it was found that the group of cultivars that showed resistance and intermediate reactions to the isolates were: Bem-te-vi, Campos Gerais, Curió, Diacol, Tuning, Eldorado, Tangará and Tuiuiú. Cultivar Tuiuiú was the highlight of the most resistant cultivars. Rosinha G2, Preto Uberabinha and IPA6 were more susceptible to Fop isolates. The present isolates were not highly aggressive, however IPR7.8, PMG5.9 and IAC9453 were more virulent. From the results obtained, it is possible to suggest that there are at least 2 Fop races sampled in this study and that they are most likely races 1 and 2. Thus, considering that only 6 isolates were tested in this study, the indication of the occurrence of 2 different races between them suggests that there is great variability. Furthermore, the results obtained here show that there is good resistance to Fusarium wilt among common bean cultivars planted in the regions of greatest importance for the crop in Brazil.