FIG. 1.

Phylogenetic tree of isolates. Phylogenetic relationships of isolates were inferred from a comparison of an approximately 500-bp region of the 16S rRNA gene sequence by using CLUSTAL W for multiple alignments and NJPlot for construction of the tree. The bootstrap values at the nodes are based on 1,000 iterations. Boldface type indicates producers that inhibited 10 or more isolates, lightface uppercase type indicates nonproducers that inhibited one to nine isolates; and lightface lowercase type indicates nonproducers.