Fig. 2. Expression of StPT2 is predominantly in the root tip and is increased by P depletion. Measurement of StPT2 in tip (1 cm), middle (next 4 cm) and upper (root base) parts of P-depleted and P-supplied roots by (A) western blotting of whole root extracts probed with StPT2 antibody and (B), RQ RTPCR using StPT2 gene specific primers with C, 18 S rRNA using 18S specific primers as a loading control.