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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
04/11/2022 |
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Data da última atualização: |
04/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
D'ÁVILA, L. S.; FILIPPI, M. C. C. de; CAFÉ-FILHO, A. C. |
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Afiliação: |
LETICIA SILVEIRA D'ÁVILA, UNIVERSIDADE DE BRASÍLIA; MARTA CRISTINA CORSI DE FILIPPI, CNPAF; ADALBERTO C. CAFÉ-FILHO, UNIVERSIDADE DE BRASÍLIA. |
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Título: |
Fungicide resistance in Pyricularia oryzae populations from southern and northern Brazil and evidence of fitness costs for QoI-resistant isolates. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Crop Protection, v. 153, 105887, Mar. 2022. |
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ISSN: |
0261-2194 |
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DOI: |
https://doi.org/10.1016/j.cropro.2021.105887 |
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Idioma: |
Inglês |
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Conteúdo: |
Rice blast management is heavily reliant on chemical control, and the rise of fungicide resistance is contingent on fitness costs. This study contrasts the responses of 322 blast isolates from southern (n = 224) and northern Brazil (n = 98) to fungicides in the Quinone outside inhibitor (QoI), Sterol demethylation inhibitor (DMI), and Melanin biosynthesis inhibitor (MBI) groups, and associated epidemiological traits. Resistance was more prevalent in northern Brazil, where conditions are most conducive to blast. Northern populations displayed higher EC50 for spore germination, faster mycelial growth rates, and higher rates of appressorium formation for fungicides in all chemical groups. Results were most striking for the QoI fungicide azoxystrobin. We examined possible fitness penalties and related in planta competitive abilities associated with the gain of azoxystrobin resistance. QoI-resistant (QoI-R) genotypes, carrying the G143A cytochrome b gene mutation, were found in 90% of the northern isolates. The EC50 values of these QoI-R isolates exceeded 10 ug L-1. However, QoI-R isolates had a reduced number of conidia, longer latent period, reduced infection efficiency and aggressiveness, compared to the sensitive isolates. These impairments were reflected in a decrease of competitive ability in planta in the absence of azoxystrobin. Nevertheless, under continuous fungicide applications, the proportion of resistant and sensitive isolates in mixed cultures in planta remained constant after four generations. The results are valuable for managing strategies as the increase of resistance may hamper the competitive abilities of QoI-R mutants in the absence of the respective active ingredient. MenosRice blast management is heavily reliant on chemical control, and the rise of fungicide resistance is contingent on fitness costs. This study contrasts the responses of 322 blast isolates from southern (n = 224) and northern Brazil (n = 98) to fungicides in the Quinone outside inhibitor (QoI), Sterol demethylation inhibitor (DMI), and Melanin biosynthesis inhibitor (MBI) groups, and associated epidemiological traits. Resistance was more prevalent in northern Brazil, where conditions are most conducive to blast. Northern populations displayed higher EC50 for spore germination, faster mycelial growth rates, and higher rates of appressorium formation for fungicides in all chemical groups. Results were most striking for the QoI fungicide azoxystrobin. We examined possible fitness penalties and related in planta competitive abilities associated with the gain of azoxystrobin resistance. QoI-resistant (QoI-R) genotypes, carrying the G143A cytochrome b gene mutation, were found in 90% of the northern isolates. The EC50 values of these QoI-R isolates exceeded 10 ug L-1. However, QoI-R isolates had a reduced number of conidia, longer latent period, reduced infection efficiency and aggressiveness, compared to the sensitive isolates. These impairments were reflected in a decrease of competitive ability in planta in the absence of azoxystrobin. Nevertheless, under continuous fungicide applications, the proportion of resistant and sensitive isolates in mixed cultures in planta remained co... Mostrar Tudo |
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Palavras-Chave: |
Trycyclazole. |
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Thesagro: |
Arroz; Brusone; Fungicida; Oryza Sativa; Pyricularia Oryzae. |
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Thesaurus Nal: |
Azoxystrobin; Blast disease; Fungicides; Magnaporthe oryzae; Rice; Tebuconazole; Trifloxystrobin. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
null
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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| 5. |  | MOSCARDI, F.; SANTOS, B.; MORALES, L. An overview of the program for use of a Nucleopolyhedrovirus of Anticarsia gemmatalis in soybean and recent achievements to improve the program. In: WORLD SOYBEAN RESEARCH CONFERENCE, 7.; INTERNATIONAL SOYBEAN PROCESSING AND UTILIZATION CONFERENCE, 4.; CONGRESSO BRASILEIRO DE SOJA, 3., 2004, Foz do Iguassu. Abstracts of contributed papers and posters. Londrina: Embrapa Soybean, 2004. p. 52. (Embrapa Soja. Documentos, 228). Editado por Flávio Moscardi, Clara Beatriz Hoffmann-Campo, Odilon Ferreira Saraiva, Paulo Roberto Galerani, Francisco Carlos Krzyzanowski, Mercedes Concordia Carrão-Panizzi.| Biblioteca(s): Embrapa Soja. |
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| 6. | | MOSCARDI, F.; MORALES, L.; SANTOS, B. The successful use of AgMNPV for the control of velvetbean caterpillar, Anticarsia gemmatalis, in soybean in Brazil. In: INTERNATIONAL COLLOQUIUM ON INVERTEBRATE PATHOLOGY AND MICROBIAL CONTROL, 8.; INTERNATIONAL CONFERENCE ON BACILLUS THURINGIENSIS 6.; ANNUAL MEETING OF THE SIP, 35., 2002, Foz do Iguassu. Proceedings... Londrina: Embrapa Soja: Embrapa Recursos Genéticos e Biotecnologia: UEL: SIP, 2002. p. 86-91. (Embrapa Soja. Documentos, 184; Embrapa Recursos Genéticos e Biotecnologia, 74).| Biblioteca(s): Embrapa Soja. |
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| 10. | | MORALES, L.; MOSCARDI, F.; SOSA-GÓMEZ, D.R. Further results with optical brighteners as enhancers to Anticarsia gemmatalis (Lepidoptera: Noctuidae) nucleopolyhedrovirus activity. In: INTERNATIONAL COLLOQUIUM ON INVERTEBRATE PATHOLOGY AND MICROBIAL CONTROL, 8.; INTERNATIONAL CONFERENCE ON BACILLUS THURINGIENSIS 6.; ANNUAL MEETING OF THE SIP, 35., 2002, Foz do Iguassu. Program and abstracts. Londrina: Embrapa Soja: Embrapa Recursos Genéticos e Biotecnologia: UEL: SIP, 2002. p. 82-83. (Embrapa Soja. Documentos, 183; Embrapa Recursos Genéticos e Biotecnologia, 73).| Biblioteca(s): Embrapa Soja. |
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| 14. | | SOSA-GOMEZ, D.R.; CORSO, I. C.; MORALES, L. Insecticide resistance to endosulfan, monocrotophos and metamidophos in the neotropical brown stink bug, Euschistus heros. (F.). Neotropical Entomology, Londrina, v. 30, n. 2, p. 317-320, June 2001.| Biblioteca(s): Embrapa Soja. |
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| 19. | | DOMIT, L. A.; ADEGAS, F. S.; MORALES, L. Transferencia de tecnologia recomendadas para a cultura da soja no Parana e norte de Santa Catarina, atraves do sistema de treino e visita, na safra 97/98. In: REUNIAO DE PESQUISA DE SOJA DA REGIAO CENTRAL DO BRASIL, 20., 1998, Londrina. Ata e resumos. Londrina: EMBRAPA-CNPSo, 1998. p.178-179. (EMBRAPA-CNPSo. Documentos, 121).| Biblioteca(s): Embrapa Soja. |
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