Shortage absorbed by plants inorganic phosphate (Pi) in the environment is a phenomenon often encountered . Plants adapt to the conditions of such stress by running a series of mechanisms that increase the download Pi Pi substrate and the mobilization of internal resources. The roots can secrete organic acids to the substrate , acid phosphatase , as well as , if necessary , ribonuclease . Followed by the induction of membrane conveyors Pi and intracellular phosphatases . Many plant adaptations to phosphorus deficiency is preceded by the activation (or repression ) of specific genes .