Abstract
Mixed cultures of Azospirillum brasilense SP7 and Penicillium corylophillum allowed the efficient utilization of pectin as a carbon source for nitrogen fixation by the former organism. 93% of pectin was degraded in mixed cultures after 9-days of incubation. PG activity in separate cultures, was about 20-fold higher in P. corylophillum than that of A. brasilense. Oxalic acid was produced during pectin degradation, and the possible role of oxalate in enhancing PG activity and affecting nitrogen fixation by A. brasilense was discussed. NaCl stimulated PG production by A. lipoferum st. 137 and the maximum production was obtained at 0.05 M after 4 days of incubation. In a micro vegetative experiment with Zea mays inoculated with A. lipoferum st. 137 in presence of different concentrations of NaCl, inoculated roots exhibited higher PG production as compared with the control treatments at 0.05 M NaCl. Increase in PG production was accompanied by increase in total Azospirillum counts in the histoshpere, dry matter and plant total N-yield. It was suggested that PG production by A. lipoferum in vivo could be used as an indicator for successful Azospirillum-host plant association.
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