title: Pollen viability, physiology, and production of maize plants exposed to pyraclostrobin+epoxiconazole.
abstract: The use of fungicides in maize has been more frequent due to an increase in the incidence of diseases and also the possible physiological benefits that some of these products may cause. However, some of these products (e.g., strobilurins and triazoles) may interfere with physiological processes and the formation of reproductive organs. Therefore, the effect of these products on plants at different developmental stages needs to be better understood to reduce losses and maximize production. The effect of the fungicide pyraclostrobin+epoxiconazole (P+E) was evaluated at different growth stages in meiosis, pollen grain viability and germination, physiology, and production of maize plants in the absence of disease. An experiment was carried out with the hybrid DKB390 PROII and the application of pyraclostrobin+epoxiconazole at the recommended dose and an untreated control at 3 different timings (S1 - V10; S2 - V14; S3 - R1) with 5 replications. Gas exchange, chlorophyll fluorescence, pollen viability and germination, as well as the hundred-grain weight were evaluated. Anthers were collected from plants of S1 for cytogenetic analysis. The fungicide pyraclostrobin+epoxiconazole reduced the viability of pollen grains (1.4%), but this was not enough to reduce production. Moreover, no differences were observed in any of the other parameters analyzed, suggesting that P+E at the recommended dose and the tested stages does not cause toxic effects.
authors.affiliation: Laboratório de Ecofisiologia e Produtividade Vegetal, Instituto Federal de Educação, Ciência e Tecnologia Goiano - Campus Rio Verde, Caixa Postal 66, 75901-970 Rio Verde, GO, Brazil. Electronic address: veronicajunqueira@gmail.com.
authors.forename: Verônica Barbosa
authors.initials: VB
authors.lastname: Junqueira
authors.affiliation: Laboratório de Ecofisiologia e Produtividade Vegetal, Instituto Federal de Educação, Ciência e Tecnologia Goiano - Campus Rio Verde, Caixa Postal 66, 75901-970 Rio Verde, GO, Brazil. Electronic address: alcarcos@pq.cnpq.br.
authors.forename: Alan Carlos
authors.initials: AC
authors.lastname: Costa
authors.affiliation: Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro - Campus Uberlândia, Caixa Postal 1020, 38400-970 Uberlândia, MG, Brazil. Electronic address: tatiana.boff@gmail.com.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Boff
authors.affiliation: Laboratório de Ecofisiologia e Produtividade Vegetal, Instituto Federal de Educação, Ciência e Tecnologia Goiano - Campus Rio Verde, Caixa Postal 66, 75901-970 Rio Verde, GO, Brazil. Electronic address: caroline.muller@terra.com.br.
authors.forename: Caroline
authors.initials: C
authors.lastname: Müller
authors.affiliation: Laboratório de Biotecnologia, Instituto Federal de Educação, Ciência e Tecnologia Goiano - Campus Rio Verde, Caixa Postal 66, 75901-970 Rio Verde, GO, Brazil. Electronic address: maria.andreia@ifgoiano.edu.br.
authors.forename: Maria Andréia Corrêa
authors.initials: MA
authors.lastname: Mendonça
authors.affiliation: Laboratório de Ecofisiologia e Produtividade Vegetal, Instituto Federal de Educação, Ciência e Tecnologia Goiano - Campus Rio Verde, Caixa Postal 66, 75901-970 Rio Verde, GO, Brazil. Electronic address: priscilaferreira.bio@gmail.com.
authors.forename: Priscila Ferreira
authors.initials: PF
authors.lastname: Batista
mesh_terms: D002219:Carbamates / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004579:Electron Transport / Q000187:drug effects; D004852:Epoxy Compounds / Q000494:pharmacology*; D005659:Fungicides, Industrial / Q000494:pharmacology*; D018525:Germination / Q000187:drug effects; D011058:Pollen / Q000187:drug effects* / Q000502:physiology; D011720:Pyrazoles / Q000494:pharmacology*; D000073739:Strobilurins; D014230:Triazoles / Q000494:pharmacology*; D003313:Zea mays / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology*
chemical_list: D002219:Carbamates; D004852:Epoxy Compounds; D005659:Fungicides, Industrial; D011720:Pyrazoles; D000073739:Strobilurins; D014230:Triazoles; C513428:pyrachlostrobin; C109476:epoxiconazole
keywords: Chemical control; Corn; Strobilurin; Triazole; Zea mays