The present invention provides a method for Agrobacterium-mediated gene transfer into a plant material, which comprises inoculating an Agrobacterium into the plant material in the presence of a powder. In the method of the present invention, the powder at least does not affect living tissues and has one or more properties selected from the group consisting of: being insoluble in water having an affinity for living tissues having adsorption properties and having a surface polarity. The present invention also provides a method for producing a transformed plant, which comprises using the gene transfer method of the present invention.
