Participation of Auxin Transport in the Early Response of the Arabidopsis Root System to Inoculation with Azospirillum brasilense

The potential of Plant Growth Promoting Rhizobacteria (PGPR) has been demonstrated in the case plant inoculation with bacteria genus Azospirillum which improves yield. A. brasilense produces a wide variety molecules, including natural auxin indole-3-acetic acid (IAA), as well other phytoregulators. However, several studies have suggested that induces changes development during their interaction bacteria. effects Sp245 on Arabidopsis thaliana root were investigated to help explain molecular basis interaction. results obtained showed decrease primary length from first day and remained so throughout exposure, accompanied by stimulation initiation maturation lateral primordia an increase roots. An enhanced response was evident vascular tissue meristems inoculated plants. after five days bacterization, disappeared meristems. role polar transport (PAT) auxins relocation involved PGP1, AXR4-1, BEN2 proteins, apparently mediated brasilense-induced branching seedlings.