FIG. 2.

Fitch-Margoliash tree of amoA sequences recovered from rice root environment. The sequences span a common stretch of 450 nucleotide bases corresponding to the fragment amplified by the amoA primer pair (minus primer sequences). Sequences in boldface type were generated during this study. Clones were selected from three clone libraries by DGGE. Prefixes indicate the cultivar source of amoA as follows: IR, IR63087-1-17; MA, Mahsuri. Numbers at bifurcations represent percentage bootstrap values (100 repetitions). The scale bar represents 10% sequence divergence.