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Atividade de enzimas associadas ao estado de indução em mudas de cacaueiro expostas a dois actinomicetos residentes de filoplano Activity of enzymes associates of induced resistance on cocoa seedlings exposed of two actinomycetes phylloplane residents

By Dirceu Macagnan, Reginaldo da Silva Romeiro, Maria Cristina Baracat-Pereira, Roberto Lanna-Filho, Gisele Sales Batista and Alan Willian Vilela Pomella

Abstract

Dois antagonistas selecionados para o biocontrole da vassoura-de-bruxa do cacaueiro foram avaliados quanto à capacidade em ativar mecanismos de defesa de plantas contra patógenos. Para tanto, mudas seminais de cacaueiro "comum" foram cultivadas em casa-de-vegetação por 30 dias e expostas aos antagonistas aplicados a mudas de cacaueiro por atomização, individualmente e em associação. O primeiro par de folhas das mudas dos diferentes tratamentos foi coletado aos dois, quatro, 12 e 24 dias após a exposição aos antagonistas. Foi quantificada a atividade de peroxidases, polifenoloxidases, quitinases e beta-1,3-glucanases no material coletado. Observou-se um aumento na atividade de peroxidases e polifenoloxidases nos primeiros dias após a exposição das mudas, especialmente ao isolado Ac26. Não foi observado efeito aditivo ou sinergístico nas mudas expostas aos dois isolados simultaneamente.<br>Two antagonists selected for the biocontrol of cocoa witches' broom were investigated for their ability in triggering increases in the activity of enzymes associated to induced resistance. In a greenhouse, thirty days old cocoa seedlings were exposed t antagonists by spraying a propagule suspension of every antagonist or a mixture of them. At two, four 12 and 24 days exposing plants to the antagonists, the first leaf pair of every plant was excised and used for quantifying the activity of peroxidases, poly-phenol-oxidases, chitinases and beta-1,3-glucanases. There were increases in activity of peroxidases, poly-phenol-oxidases, mainly in the case of isolate Ac26. Additive or synergistic effects were not observed as a consequence of exposing plants to both antagonists together

Topics: Streptomyces, peroxidases, enzimas líticas, indução de resistência, Theobroma cacao, Streptomyces, peroxidases, induced resistance, litic enzymes, Theobroma cacao, LCC:Botany, LCC:QK1-989, LCC:Science, LCC:Q, DOAJ:Botany, DOAJ:Biology, DOAJ:Biology and Life Sciences, LCC:Plant culture, LCC:SB1-1110, LCC:Agriculture, LCC:S, DOAJ:Plant Sciences, DOAJ:Agriculture and Food Sciences
Publisher: Grupo Paulista de Fitopatologia
Year: 2008
DOI identifier: 10.1590/S0100-54052008000100007
OAI identifier: oai:doaj.org/article:4f0748e125504f8a8dc571241dad3133
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