Characterization of the Bipolaris maydis: symptoms and pathogenicity in popcorn genotypes (Zea mays L.).

Autor: Ferreira CM; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Fitotecnia - LFIT, Campos dos Goytacazes, RJ, Brasil., Saluci JCG; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil., Vivas M; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil., Santos JS; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil., de Andrade Junior MS; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil., Vivas JMS; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil., Ramos GKS; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil., Graviana GA; Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Centro de Ciências e Tecnologias Agropecuárias - CCTA, Laboratório de Engenharia Agrícola - LEAG, Campos dos Goytacazes, RJ, Brasil.
Jazyk: angličtina
Zdroj: Brazilian journal of biology = Revista brasleira de biologia [Braz J Biol] 2022 Feb 02; Vol. 84, pp. e256799. Date of Electronic Publication: 2022 Feb 02 (Print Publication: 2022).
DOI: 10.1590/1519-6984.256799
Abstrakt: Southern corn leaf blight (SCLB) is one of the most important corn leaf diseases. Appropriate management strategies and the use of resistant cultivars allow disease control. Therefore, knowing the aspects related to the pathogen and the response of hosts makes it possible to design efficient strategies for selecting genotypes resistant to this disease. In this sense, the objective was to carry out the Bipolaris maydis isolate characterization, evaluating the pathogenicity in different popcorn lines and the symptoms generated in the host after inoculation. The isolate characterization consisted of the macromorphological evaluation of the colonies and the micromorphological evaluation of the conidia in the PDA medium. An experiment was carried out in a greenhouse to evaluate the pathogenicity of the isolate, using 20 inbred lines of popcorn in a randomized block design with four replicates. Inoculation was carried out by spraying leaves, with a suspension containing 1.0 x 104 conidia.ml-1 of the CF/UENF 501 isolate of B. maydis. An incidence assessment and three assessments of disease symptom severity were performed, with seven days intervals between evaluations. The morphological characterization data of the isolate were analyzed using descriptive statistics, and for disease severity, the linear regression model was applied the first-degree model. The variance analysis was performed for the linear and angular coefficients obtained for each treatment. When a difference was found, the Scott-Knott clustering algorithm at 5% significance was applied. The isolate had gray-green colonies, a cottony appearance, and an irregular shape. The lines L353, L354, and L624 show more resistance at the beginning and throughout the evaluations. The high virulence of the CF/UENF 501 isolate made it possible to differentiate the lines in terms of disease intensity and the pattern of symptoms presented.
Databáze: MEDLINE