Studies on the Growth in Culture of Plant Cells: XXIV. EFFECTS OF 2, 4-DICHLOROPHENOXYACETIC ACID AND LIGHT ON THE GROWTH AND METABOLISM OF ACER PSEUDOPLATANUS L. SUSPENSION CULTURES

Omission of 2,4-dichlorophenoxyacetic acid (2,4-D) from batch cultures of sycamore (Acerpseudoplatanus</it>L.) caused growth cessation after an initial period of exponential growth. The presence of white light reduced the amount of growth after 2,4-D withdrawal. Growth cessation, in the absence of 2,4-D, was accompanied by the accumulation of the free amino acid, serine. This accumulation began before the cessation of growth and was rapidly reversed by the re-addition of 2,4-D.