Methods of increasing plant biomass and oilseed production

A transgenic plant produced using a method comprising:

• a. contacting a plant cell with a nucleic acid molecule encoding an exogenous starch-branching enzyme selected from starch-branching enzyme 1 (SBEI) and starch-branching enzyme 2b (SBEIIb) to obtain a transformed plant cell,
• b. expressing the nucleic acid molecule in the transformed plant cell, and
• c. producing a plant from the transformed plant cell,
• wherein the nucleic acid molecule is from a cereal plant and wherein the plant is a dicotyledon,
• wherein the plant has increased biomass, seed production and/or oil production compared to a wild-type plant not transformed with the nucleic acid molecule,
• wherein the nucleic acid molecule comprises a nucleic acid sequence that has at least 80% sequence identity with a nucleic acid sequence selected from SEQ ID NO:
• 1 or 3, and
• wherein the cereal plant is maize, wheat, barley, sorghum, oat, rye, millet, triticale or rice.