| abstract |
The present invention relates to a method for producing a cell culture of a plant of the family Betulaceae, said method comprising two steps, in the first step, the birch callus line being cultured in a liquid medium comprising a medium used for culturing plant cells and tissues, with or without irradiation, to obtain a suspension primary cell culture, and in the second step, the suspension primary cell culture being increased in at least two steps in the liquid medium with or without irradiation. |