Apple trees reveal secrets of sugar interconversions, unlocking growth potential.
Apple tree tissues can convert sugars like sucrose, fructose, and sorbitol into other carbohydrates. Leaves can turn fructose into sucrose, while only leaves can change sucrose into sorbitol. As apple seeds grow, they get better at turning sorbitol and fructose into sucrose. Sorbitol seems to be a final product, while sucrose is used more directly in carbohydrate use.