fixers were G- and comprised representatives of Pantoea sp.
(13 isolates), Sphingomonas sp. (2 isolates), Acinetobacter sp.
(CT5), and Pseudomonas sp. (isolate CT11). Forty-one percent
of the isolates (16/39) were able to grow in a defined
medium containing CaHPO4 and produced a clarification
halo around the colony indicative of CaHPO4 solubilization.
This feature was mainly associated with isolates of the BOXPCR
group B. Finally, based on the concentration of IAA
and reactive related compounds detected in cultures grown
in a minimal medium containing tryptophan, the isolates
could be categorized into 3 groups: strong (>30 μg/ml; 18%
of the isolates), intermediate (10-30 μg/ml; 38% of the iso