The present invention relates to a method for introducing florigen into cells of plant shoot apex using a membrane-penetrating peptide. More specifically, florigen is introduced into the cells of the plant shoot apical tissue, comprising the step of contacting the plant shoot apex tissue with a solution for introducing florigen in which the florigen and the membrane-permeable peptide are present in the same solvent. On how to do. The present invention further relates to a florigen-introducing agent into cells of plant shoot apical tissue, and a florigen introduction kit into cells of plant shoot-tip tissue, further comprising florigen and a membrane-penetrating peptide.
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