Figure 5.

Concentrations of other polar metabolites in relation to transport sugars in leaves. Leaf transport sugars are Suc, Suc plus raffinose in the case of polymer trapping species, and Suc plus sugar alcohol (sa) in the case of sugar alcohol-transporting species. Other metabolites refer to polar metabolites other than transport sugars. Non-sugar alcohol species are those that do not transport sugar alcohols. Regression equations are as follows: for non-sugar alcohol species, y = 1.517x + 92.50 (r² = 0.66, P < 0.0001, n = 30); for sugar alcohol species, y = 0.352x + 45.89 (r² = 0.58, P = 0.001, n = 15).