Fig. 1.

(A) Gas chromatogram showing the separation of metabolites from the chloroform phase of Arabidopsis thaliana phloem exudates. The bottom panel displays metabolites present in the exudates of petioles incubated first in EDTA to prevent the sealing of the phloem. The top panel demonstrates the absence of any major metabolite peaks if the petioles were incubated in water (water control). The water control was fitted to the same scale as the EDTA extract. Both panels are a typical representative of three biological replicates. (B) Distribution of metabolites detected in Arabidopsis phloem exudate. They were grouped into amino acids (A), sugars and sugar derivatives (B), fatty acids/-esters (C), organic acids and phosphates (D), others (E), and unknowns (F).