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Recovery of P. polymyxa strains L6 and Pw-2 from washes of lodgepole pine seedling roots before (a) and after (b) heat treatment (55°C, 30 min), determined for roots after 6, 9, or 12 weeks of incubation. Standard errors are indicated by bars. Black bars represent data for strain Pw2; gray bars represent data for strain L6. The average CFU of L6 recovered per root after heat treatment (±standard error) for weeks 6, 9, and 12 were 12 (±9), 520 (±380), and 4,200 (±2,000), respectively.
