Figure 5.

AsA_t content of petiole exudates after treatment of source leaves with AsA precursors. Terminal leaflets of glasshouse grown potato plants were supplied with 500 μl of the substrate indicated (25 mM) via a 'flap' whilst still attached to the plant. After 24 h incubation, leaflets were removed for AsA_t determination in tissues and collection of exudates (90 min). Bars represent the mean exudate AsA_t peak area ± SE (n = 4) and values in boxes represent the mean tissue AsA_t content (mg/100 gFW) ± SE (n = 4). mAUt = milli-absorbance units (λ245 nm) × time