FIG. 2.

Neighbor-joining tree showing the phylogenetic relationships of the Gram-positive bacterial isolates associated with oak and spruce, based on PCR sequencing of a portion of the 16S rRNA gene with primers pA and pH. A bootstrap analysis was performed with 1,000 repetitions, and only values greater than 80 are indicated at the nodes. The bootstrap analysis identified four clusters: E, F, G, and H. The bacterial isolates used in this study were designated based on their origins. The PN isolates from the bulk soil and the PML isolates from the mycorrhizosphere came from the oak stand. The bacterial isolates preceded by the letter E (EPN and EPML) came from the spruce stand.