Figure 8.

Growth of Arabidopsis wild-type (WT), atptr1-1, atptr5-1, atptr1-2 atptr5-1, and 35S:AtPTR5a seedlings on medium containing peptides as sole N source. Seeds were germinated and plants cultivated for 2 weeks either on AM medium or on one-half-strength Murashige and Skoog medium lacking NH₄NO₃, and KNO₃ replaced by KCl (−N) in the presence or absence of 20 mm of a dipeptide as a sole N source. Alternatively, seedlings were cultivated on −N medium supplemented with 10 mm Pro and 10 mm Ala (+Ala+Pro). Data shown are representative for the independent mutants and overexpressing lines, respectively.