Real-time RT-PCR analysis of the Pht1 genes in tomato roots and leaves in response to mycorrhizal fungi colonization under high and low Pi supply conditions. The plants were incubated for two months with a mycorrhizal inoculum containing Glomus intraradices. LP and HP represent supply with 0.05 mM and 1 mM Pi, respectively; -M and + M represent the inoculation with autoclaved and active inoculum, respectively. The relative expression levels of each tomato Pht1 gene was also shown as percentage of the constitutive Actin expression activity. Each bar was the mean of three biological replications with standard error.