Protein IPA1 related to plant architecture, its coding genes and uses

A method of breeding a transgenic plant comprising introducing an interference vector into a target plant to obtain the transgenic plant having changed phenotypes compared with the target plant,

• wherein the interference vector is constructed by sequentially inserting a first nucleic acid comprising the nucleotide sequence of SEQ ID NO:
• 4 and a second nucleic acid comprising the nucleotide sequence of SEQ ID NO:
• 5 into a vector thereby allowing the formation of a hairpin structure upon expression;
• and
• wherein the changed phenotypes comprise reduced height, more tillers, thinner stems, fewer primary rachis branches, and fewer grains per panicle.