B. amyloliquefaciens FZB42 treatment effects on expression of root Pi transporters, and genes involved in internal Pi metabolism. A Relative expression of T. aestivum PHT1 genes, in roots, standardised to actin (ACT) controls. The experimental treatments were: inoculation with B. amyloliquefaciens FZB42, treatment with 1 µM IAA and untreated controls. B Relative expression of T. aestivum Pi metabolism genes in roots, standardised to actin (ACT) controls with the same treatments as in A. For A and B n = 3 for each treatment, error bars are SEM, and * marks values significantly different from the untreated control value using Student’s t-test (p < 0.05).