Fig. 5.

Influence of arbuscular mycorrhizal (AM) fungal inoculation on the expression of phosphate transporter genes in tobacco roots. Steady state mRNA levels of the phosphate transporter genes NtPT4 (a) and NtPT1 (b) were measured in roots of 8-week-old tobacco wild-type (WT) plants and transgenic lines with root-specific (W6:CKX1) or constitutive (35S:CKX1 and 35S:CKX2) reduction of cytokinin levels inoculated with the AM fungus Rhizophagus irregularis strain RI, strain FM, or their co-inoculation (RI + FM) and compared to the respective non-AM (NAM) control plants. Values are means + SE. n = 3. Each biological replicate contained roots from at least three individual plants. In both cases, the expression level of WT in non-AM controls was set to 1. For each parameter, bars topped by the same letter are not significantly different (p < 0.05) according to Duncan’s multiple range test