Fig. 5. Relative transcript levels of STPH‐H, STPH‐L, Agps, AATP, PGM‐C and CitSuSy1 in roots of girdled and non‐girdled ‘on’ and ‘off’ citrus trees (A). Total RNAs (20 µg) isolated from roots were separated and analysed by RNA blot. 18S rRNA from citrus was used as an internal control for loading differences. Relative levels of transcript (B) were estimated as described in Fig. 3.