Parassexualidade e produção de destruxinas em linhagens de metarhizim anisopliae var. anisopliae (Metsch.) sorokin

AUTOR(ES)
DATA DE PUBLICAÇÃO

1988

RESUMO

In this work the main object was the study of destruxlns production, by diploids and segregants obtained through parasexual cycle in Metarhizium anisopliae. The two parantal strains utilized were E-9 (Brazil) and F-84 (USA), which after induction with UV-radiation produced conidial color and auxotrophic mutants. The mutants E-9 am-pir, F-84 vio-tia and F-84 vio-nic were utilized because they showed a reversion frequency of auxotrophlc markers lower than 10-6 conidia. The diploids Isolated (E-9 am-pir x F-84 vio-tia and E-9 am-pir x F-84 vio-nic) were all yellow conidiating and showed yellow and violet irregular segregants on Chloroneb (150µg/ml) . As only yellow conidia diploids were isolated it can be suggested that they are not able to produce laccase, which Is the enzyme responsible for wild type (green) pigment formation. Additional tests for laccase production were made with color mutants growing together in a same Petri dish and tt could be deduced that leccase was absent. Destruxtins were analyzed by Thin-layer chromatography (TLC), showing Rf close to the pattern 0,50 and gas chromatography combined with mass spectrography. The mass spectrography showed the presence of destruxins A and B by lons formation in fractions 576,7-577,6 and 592,7-593,6 respectively. One of them showed Rf below to the pattern (0,44). Mass spectrography showed the presence of the destruxin A and B by fractions 576,7-577,&and 592,7-593,6 respectively. AI) the strains analysed produced destruxins, but the sectors S/B-la and S/B-lb, which extracts didn t have destruxlns B and A and B, respectively

ASSUNTO(S)

fungos - reprodução fungos patogenicos fungos imperfeitos

ACESSO AO ARTIGO

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