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GC-MS quantification of IAA from T. vaccinum cultures supplemented with labeled tryptophan. IAA was purified weekly over a period of 4 weeks and analyzed by GC-MS. IAA peaks were obtained by tracing [13C6]IAA. The IAA amounts shown represent IAA only from labeled tryptophan. Bars denote standard errors, and letters indicate significant differences in IAA amounts (P < 0.05). dpi, days postinoculation.
