title: Genetic variability affecting Exserohilum turcicum resistance in popcorn lines grown under high and low phosphorus conditions.
abstract: Northern leaf blight (NLB), caused by Exserohilum turcicum, is one of the main foliar diseases that affect popcorn culture. Farmers use many control measures to minimize damage caused by this disease, among which, the use of cultivars with genetic resistance is the most effective and economical. The aim of this study was to investigate genetic variability influencing resistance to NLB in 25 popcorn maize lines grown under high and low phosphorus conditions in relation to foliar fungal disease caused by E. turcicum. We evaluated the disease incidence and severity, by analysis of variance and cluster test (Scott-Knott). There was sufficient genetic variability between strains for resistance traits. Genotypic variance was higher than environmental variance, and had more discriminatory power. We conclude that new progenies could be selected for the establishment of future populations. P-7, P-9, L-59, L-71, and L-76 progenies possess promising characteristics that simultaneously reduce the severity and the incidence of NLB in popcorn plants.
authors.affiliation: Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil amaraljr@pq.cnpq.br.
authors.forename: A T
authors.initials: AT
authors.lastname: Amaral
authors.affiliation: Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: R M
authors.initials: RM
authors.lastname: Ribeiro
authors.affiliation: Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: P H D
authors.initials: PH
authors.lastname: Santos
authors.affiliation: Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: T P S
authors.initials: TP
authors.lastname: Poltronieri
authors.affiliation: Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: J M S
authors.initials: JM
authors.lastname: Vivas
authors.affiliation: Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: I F S
authors.initials: IF
authors.lastname: Gerhardt
authors.affiliation: Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: B M
authors.initials: BM
authors.lastname: Carvalho
authors.affiliation: Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: C S
authors.initials: CS
authors.lastname: Freitas
authors.affiliation: Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: S B
authors.initials: SB
authors.lastname: Miranda
mesh_terms: D001203:Ascomycota / Q000502:physiology; D018556:Crops, Agricultural / Q000235:genetics / Q000382:microbiology; D060467:Disease Resistance; D014644:Genetic Variation; D015994:Incidence; D010758:Phosphorus / Q000494:pharmacology*; D010935:Plant Diseases / Q000382:microbiology / Q000706:statistics & numerical data*; D012641:Selection, Genetic; D003313:Zea mays / Q000235:genetics* / Q000382:microbiology
chemical_list: D010758:Phosphorus