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Leaf starch levels in relation to phloem loading type. Leaf starch was measured enzymatically as Glc equivalents on samples taken at midafternoon. Apo, Apoplastic loading; PT, polymer trapping; Pas, passive loading; s, Suc; sa, sugar alcohols. Values are means ± se (n = 4–9 species). Different letters above the bars indicate significant differences using Duncan’s multiple range test at P < 0.05 after ANOVA.
