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Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
04/11/2022 |
Data da última atualização: |
04/11/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
D'ÁVILA, L. S.; FILIPPI, M. C. C. de; CAFÉ-FILHO, A. C. |
Afiliação: |
LETICIA SILVEIRA D'ÁVILA, UNIVERSIDADE DE BRASÍLIA; MARTA CRISTINA CORSI DE FILIPPI, CNPAF; ADALBERTO C. CAFÉ-FILHO, UNIVERSIDADE DE BRASÍLIA. |
Título: |
Fungicide resistance in Pyricularia oryzae populations from southern and northern Brazil and evidence of fitness costs for QoI-resistant isolates. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Crop Protection, v. 153, 105887, Mar. 2022. |
ISSN: |
0261-2194 |
DOI: |
https://doi.org/10.1016/j.cropro.2021.105887 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Trycyclazole. |
Thesagro: |
Arroz; Brusone; Fungicida; Oryza Sativa; Pyricularia Oryzae. |
Thesaurus Nal: |
Azoxystrobin; Blast disease; Fungicides; Magnaporthe oryzae; Rice; Tebuconazole; Trifloxystrobin. |
Categoria do assunto: |
H Saúde e Patologia |
Marc: |
LEADER 02684naa a2200325 a 4500 001 2148024 005 2022-11-04 008 2022 bl uuuu u00u1 u #d 022 $a0261-2194 024 7 $ahttps://doi.org/10.1016/j.cropro.2021.105887$2DOI 100 1 $aD'ÁVILA, L. S. 245 $aFungicide resistance in Pyricularia oryzae populations from southern and northern Brazil and evidence of fitness costs for QoI-resistant isolates.$h[electronic resource] 260 $c2022 520 $aRice 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. 650 $aAzoxystrobin 650 $aBlast disease 650 $aFungicides 650 $aMagnaporthe oryzae 650 $aRice 650 $aTebuconazole 650 $aTrifloxystrobin 650 $aArroz 650 $aBrusone 650 $aFungicida 650 $aOryza Sativa 650 $aPyricularia Oryzae 653 $aTrycyclazole 700 1 $aFILIPPI, M. C. C. de 700 1 $aCAFÉ-FILHO, A. C. 773 $tCrop Protection$gv. 153, 105887, Mar. 2022.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
29/09/2010 |
Data da última atualização: |
17/05/2018 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
CARVALHO, A. D. F. de; SILVA, G. O. da; PINHEIRO, J. B.; VIEIRA, J. V.; BISCAIA, D. |
Afiliação: |
AGNALDO DONIZETE FERREIRA DE CARVALHO, CNPH; GIOVANI OLEGARIO DA SILVA, CNPH; JADIR BORGES PINHEIRO, CNPH; JAIRO VIDAL VIEIRA, CNPH; DANIELLE BISCAIA, CNPH. |
Título: |
Análise de fatores para os descritores de caracterização das raízes em cenoura |
Ano de publicação: |
2010 |
Fonte/Imprenta: |
Horticultura Brasileira, Brasília, DF, v. 28, n. 2, p. S2659-S2664, jul. 2010. |
Descrição Física: |
CD-ROM. |
Idioma: |
Português |
Notas: |
Trabalho apresentado no Congresso Brasileiro de Olericultura, 50., 2010, Guarapari. Cinquenta anos contribuindo para a saúde da população brasileira. Trabalho A3097-T4606. |
Palavras-Chave: |
Análise multivariada. |
Thesagro: |
Cenoura; Daucus Carota. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/177119/1/A3097-T4606-Comp.pdf
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Marc: |
LEADER 00790nam a2200205 a 4500 001 1863222 005 2018-05-17 008 2010 bl uuuu u00u1 u #d 100 1 $aCARVALHO, A. D. F. de 245 $aAnálise de fatores para os descritores de caracterização das raízes em cenoura 260 $aHorticultura Brasileira, Brasília, DF, v. 28, n. 2, p. S2659-S2664, jul. 2010.$c2010 300 $cCD-ROM. 500 $aTrabalho apresentado no Congresso Brasileiro de Olericultura, 50., 2010, Guarapari. Cinquenta anos contribuindo para a saúde da população brasileira. Trabalho A3097-T4606. 650 $aCenoura 650 $aDaucus Carota 653 $aAnálise multivariada 700 1 $aSILVA, G. O. da 700 1 $aPINHEIRO, J. B. 700 1 $aVIEIRA, J. V. 700 1 $aBISCAIA, D.
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