The present invention relates to a nucleic acid sequence encoding an enzyme of
the starch biosynthetic pathway in a cereal plant, wherein the enzyme is selected
from the group consisting of starch branching enzyme I, starch branching enzyme
II, starch soluble synthase I, and debranching enzyme, with the provisio that the
enzyme is not soluble starch synthase I of rice, or starch branching enzyme I of
rice or maize.