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Search for sources of resistance to Fusarium wilt (Fusarium oxysporum f. sp. vasinfectum) in okra germplasm
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Search for sources of resistance to Fusarium wilt (Fusarium oxysporum f. sp. vasinfectum) in okra germplasm
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Search for sources of resistance to Fusarium wilt (Fusarium oxysporum f. sp. vasinfectum) in okra germplasm
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Journal Article
Search for sources of resistance to Fusarium wilt (Fusarium oxysporum f. sp. vasinfectum) in okra germplasm
2013
Overview
Fusarium oxysporum f. sp. vasinfectum (FOV) is one the most destructive okra (Abelmoschus esculentus) pathogens in Brazil. Fifty-four okra accessions were evaluated for resistance to FOV. Greenhouse screening was initially carried out with one FOV isolate ('Fus-194'). Inoculation (in all assays) was carried out with 21-day-old plantlets, using the root-dipping inoculation technique. Thirty-three accessions displaying differential responses in the first screening were re-evaluated in two additional assays, using two FOV isolates ('Fus-194' and 'Fus-201'). Twelve accessions were rated as highly to intermediately resistant to 'Fus-194' during the dry/moderate temperature season, whereas nine accessions were classified as highly to intermediately resistant to 'Fus-201'. In the assay carried out in the wet and warm season, 72% of the accessions were classified as having high and intermediate resistance to 'Fus-194', and 32% were resistant to 'Fus-201'. The accessions 'Santa Cruz-47', 'BR-2399' and 'BR-1449' were the most promising resistance sources. Fusarium oxysporum f. sp. vasinfectum (FOV) é um dos patógenos mais destrutivos do quiabeiro (Abelmoschus esculentus) no Brasil. Cinquenta e quatro acessos de quiabeiro foram avaliados quanto à resistência a FOV em casa de vegetação. Inicialmente foi conduzida uma seleção com o isolado 'Fus-194'. Trinta e três acessos, que foram resistentes na seleção inicial, foram reavaliadas em dois ensaios adicionais (sob duas condições de ambiente), utilizando dois isolados de FOV. Destes, onze acessos foram classificadas como altamente ou medianamente resistentes ao isolado 'Fus-194' em agosto (estação seca e com temperatura moderada), enquanto que 28% dos acessos foram classificados como altamente ou medianamente resistentes ao isolado 'Fus-201'. No ensaio conduzido na estação úmida e quente, 72% dos acessos apresentaram reação de alta a média resistência a 'Fus-194', enquanto que 32% foram resistentes a 'Fus-201'. A cultivar 'Santa Cruz-47' e os acessos 'BR-2399' e 'BR-1449' foram as fontes de resistência mais promissoras.
Publisher
Crop Breeding and Applied Biotechnology,Brazilian Society of Plant Breeding
