The present invention relates to a method for identifying proteins
involved in the phosphorylation of starch and nucleic acids which code
for such proteins. The present invention further relates to plant cells
and plants which exhibit an altered activity of a protein which can be
identified using the method according to the invention. Plant cells and
plants of this type synthesise a modified starch. The present invention
therefore also relates to the starch synthesised by the plant cells and
plants according to the invention as well as to methods for the
manufacture of this starch and to the manufacture of starch derivatives
of this modified starch.