Variabilidade genética do fungo Erythricium salmonicolor, agente causal da rubelose dos citros / Genetic variability of fungus Erythricium salmonicolor, causal agent of pink disease of citrus

AUTOR(ES)

Fernanda Luiza de Souza

DATA DE PUBLICAÇÃO

2006

RESUMO

The fungus Erythricium salmonicolor is the causal agent of pink disease, which infects branches of many host plants, such as citrus, rubber, and apple. This disease may be a serious problem in Brazil, since it can reduce the citrus production up to 10%. Brazil is the major world citrus producer, therefore this problem is alarming. The genetic diversity of E. salmonicolor from Brazilian plants has not been evaluated, so the aims of this study were i) to evaluate the genetic diversity by RAPD of E. salmonicolor isolates from São Paulo and Minas Gerais; ii) to evaluate the vegetative compatibility and hyphal fusion of this fungus; and iii) to select endophytic bacteria able to inhibit the E. salmonicolor growth. RAPD analysis showed at least 6 distinct haplotypes (A, B, C, D, E, F), which did not have correlation with the isolation site and host plant. Also, vegetative compatibility tests showed that 84% of crosses resulted in hyphal fusion, but this compatibility was not related to the RAPD haplotypes. Eight endophytic bacteria were selected against E. salmonicolor, which could be used for biological control of this pathogen. However it was observed different types of interaction among endophytic bacteria and E. salmonicolor strains, since these bacteria inihibited differentially two fungi isolates. It reveals the genetic variability between these fungi isolates that belongs to different haplotypes These results show the importance of future studies concerning the sexual phase of E. salmonicolor, since the genetic variability seems to be high and this hyphal fusion, which precede the formation of heterokaryon (sexual and parassexual reproduction), could be responsible for the variability in this filamentous fungus.

ASSUNTO(S)

fungo fitopatogênico biological control controle biológico pink diseas marcador molecular variação genética rapd fruta cítrica vegetative compatibility erythricium salmonicolor rubelose

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