Identificação, caracterização molecular e avaliação da expressão do gene de uma proteína elicitora de defesa de trichoderma spp. / Identification, molecular characterization and evaluation of gene expression of a protein elicitors of defense of Trichoderma spp.

AUTOR(ES)

Rachel Silveira Freitas

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

30/06/2011

RESUMO

Species of the genus Trichoderma have been used as biocontrol agents against different pathogens. The mechanisms employed by Trichoderma species against these pathogens ranging from competition for nutrients, production of non-volatile and volatile antibiotics in the production of hydrolytic enzymes, in a mechanism denominated mycoparasitism. In addition to its characteristics, many strains of Trichoderma are competent rhizosphere are able to colonize and grow in association with plant roots. The root colonization by Trichoderma spp., often is associated with the induction of local and systemic resistance. Whereas fungi of the genus Trichoderma have been described as inducers of defense responses and systemic resistance in association with maize (Zea mays), cucumber, tomato and cotton, it was our interest to analyze the interaction between Trichoderma spp. and beans. Therefore, this study aimed to identify and evaluate gene expression of protein elicitors of defense (SM1) in different isolates of Trichoderma spp. obtained from Cerrado soils. Eight isolates were selected and all showed a band of approximately 250pb, corresponding to the expected size of the gene Sm1 from T. Virens. The complete sequence of SM1 gene was obtained using as template cDNA and genomic DNA of T. harzianum. The amplification products containing an ORF of 417 bp and the protein predicted from this sequence has 138 amino acids. The ORF showed identity with sequences of other protein elicitors isolated from Trichoderma spp., and also proteins belonging to the family of cerato-platanin. Studies of the expression of SM1 with the isolate Trichoderma 37 showed that this protein is expressed in different carbon sources.

ASSUNTO(S)

trichoderma spp. proteína elicitora resposta de defesa análise de expressão biologia molecular trichoderma spp. elicitors protein defense response expression analysis

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