Diversidade genética de isolados de Botryosphaeria rhodina produtores de jasmonatos

Abstract

In this work three Brazilian B. rhodina, and also two strains from Cuba, selected for their ability to produce jasmonate compounds, were submitted to molecular analysis of internal transcribed spacers- ITS regions of rDNA to characterize their genetic variability. rDNA extraction procedures were conducted according classic protocols followed by amplification, via the PCR technique, of conserved ITS regions with the primers ITS1 and ITS4. The PCR products were purified using the GFX purification kit (GE-Healthcare), resolved in “MegaBace” 1000 – DNA Analysis System (GE-Healthcar) and further identified by comparative analysis with ITS regions of rDNA sequences from the databases available at the National Center for Biotechnology Information (NCBI). Analyses were performed with the BLAST tool and the multiple alignments of sequences with Clustal W program from the computational package BioEdit. Moreover, analysis using the TCS program resulted in the identification of nine haplotypes separated by ten polymorphic sites. AFLP analyses were also implemented using four combinations of oligonucleotide primers which resulted in the generation of 300 polymorphic markers. The mean number of amplified fragments by primer pair was 79 with up to 95% of polymorphic bands. The genetic distance between B. rhodina strains was estimated in 29.19%. Dendogram constructed with Jaccard’s coefficient of similarity showed that analyzed strains were assembled in four groups with high genetic variability found in all strains.