Figure 3

Principal Component Analysis (PCA) biplots of the normalized expression level of P transporters (ZmPht1) expressed in roots at low phosphorus availability (0.47 mg kg−1) by four inbred lines of Zea mays either uninoculated (a) or in symbiosis with Rhizoglomus irregulare (b). In (a), the first and second axes explain 80.22% of total variance; in (b), the first and second axes explain 85.30% of total variance.