To meet the demands of the society, invitro production of a large number of plantlets in a short duration is practiced in floriculture and horticulture industry today. It is called

The technique of growing, culturing and maintanance of plant cells, tissues and organs outside the plant body in a suitable culture medium with nutrients under controlled environment conditions is called as micropro-pagation or tissue culture. Micropropagation or tissue culture is based on cellular totipotency. The ability of a plant cell to divide, develolp and produce a new group of cells (callus) or directly a complete plantlet is called cellular totipotency.