Method for modifying plant morphology, biochemistry and physiology

A method for increasing embryo size or weight said method comprising introducing into a plant a nucleic acid molecule encoding a plant cytokinin oxidase selected from the group consisting of:

• (a) an isolated nucleic acid molecule comprising the DNA sequence as set forth in SEQ ID NO:11 or 30 or the complement thereof,
• (b) an isolated nucleic acid molecule comprising the RNA sequence encoding the amino acid sequence of SEQ ID NO:12, or the complement thereof,
• (c) an isolated nucleic acid molecule encoding the protein comprising the amino acid sequence as set forth in SEQ ID NO:
• 12, or the complement thereof, and
• (d) an isolated nucleic acid molecule as defined in any of (a) to (c) characterized in that said nucleic acid molecule is DNA, genomic DNA, cDNA, synthetic DNA or RNA wherein T is replaced by U,
• wherein the isolated nucleic acid molecule is preferentially expressed in the embryo of the plant and wherein said expression increases embryo size or weight.

A method for increasing cotyledon size or weight, said method comprising introducing into a plant a nucleic acid molecule encoding a plant cytokinin oxidase selected from the group consisting of:

• (a) an isolated nucleic acid molecule comprising the DNA sequence as set forth in SEQ ID NO:11 or 30, or the complement thereof,
• (b) an isolated nucleic acid molecule comprising the RNA sequence encoding the amino acid sequence of SEQ ID NO:12, or the complement thereof,
• (c) an isolated nucleic acid molecule encoding the protein comprising the amino acid sequence as set forth in SEQ ID NO:
• 12, or the complement thereof, and
• (d) an isolated nucleic acid molecule as defined in any of (a) to (c) characterized in that said nucleic acid molecule is DNA, genomic DNA, cDNA, synthetic DNA or RNA wherein T is replaced by U, wherein the isolated nucleic acid molecule is preferentially expressed in the cotyledon of the plant and wherein said expression increases cotyledon size or weight.