Starch metabolism in poplar wood ray cells during spring mobilization and summer deposition [starch phosphorylase, bud break, starch synthase, D-enzyme, ADP-glucose pyrophosphorylase]

amidon amilasas amylase amylases bois carbohydrate metabolism enzymic activity hiver invierno madera maltosa maltose metabolismo de carbohidratos populus canadensis primavera printemps seasonal variation spring starch summer verano winter wood xilema xylem