Relative expression of LjNIP1 and LjXIP1. The relative expression of LjNIP1 and LjXIP1, assessed by means of qRT-PCR, in L. japonicus after 28 days of mycorrhization and 35 days after nodulation. The ct values of the samples were normalized against the ct values of the housekeeping gene UBQ10. The data for each condition are presented as the mean and were obtained from three biological and three technical replicates. –N = 10 μM KNO3; +N = 4 mM KNO3; –P = 20 μM PO43-; +P = 500 μM PO43- as indicated by Guether et al.. Bars are representing the standard deviations.