Method for gene transfer into sorghum plant using Agrobacterium， and method for production of transgenic sorghum plant

The problem to be solved by this invention is to provide a method of gene introduction for a genus Sorghum plant and a method for producing a transformed genus Sorghum plant with a higher efficiency than the conventionally known Agrobacterium method. This invention provides a gene introduction method of a genus Sorghum plant characterized by using a medium with an increased concentration of a nitrogen source and/or an increased concentration of inorganic ions selected from magnesium ion， potassium ion， calcium ion and sodium ion， in a step of preparing a plant tissue material of a genus Sorghum plant， a step of inoculation with Agrobacterium and/or a co-cultivation step. This invention also provides a method for producing a transformed plant using the gene introduction method of this invention.