Callus formation - girdled tree - Henri_Luis Duhamel du Monceau
Cell Theory - Schleiden (1838) and Schwann (1839).
The Concept of Cell Culture - Gottlieb Haberlandt (1854-1945)
History of Plant Tissue Culture: Founders
Root Cultures - Philip R. White -1934
Bud Cultures - Ernest A. Ball - 1946
Tissue Cultures - Gautheret, Nobecourt and White 1934
Media - T. Murashige and F. Skoog
Single Cell Somatic Embryogenesis - F.C.Steward