Developmental responses mostly involve changes in root architecture that enhance the root surface/soil volume ratio and, consequently, the ability of the plant to access soil phosphate. It includes increases in the root-to-shoot growth ratio, in the number of lateral roots and in the number and length of root hairs [25], [16], [19]. Also, when the root systems developed in a soil, where P ions were distributed in patches and lateral roots proliferated in areas with high concentration of P ions [20], [10].