Abstract
Summary Cell suspension cultures of Rose damascena cease growth and accumulate soluble phenols when 2,4-dichlorophenoxyacetic acid (2,4-POA), normally supplied at 1 mg 1 −1 is omitted from the culture medium. 2,4-POA can be effectively replaced by the active auxins 2,4,5-trichlorphenoxyacetic acid (2,4,5-POA) and 4-chlorophenoxyacetic acid (4-POA) at 1 mg 1 −1 . The weak auxin, 2-chlorophenoxyacetic acid (2-POA) is less active in promoting growth and a poor suppressor of soluble phenol accumulation even at 10 mg 1 −1 . α-(2-chlorophenoxy) isobutyric acid (2-POiB), which is inactive in the standard auxin bioassays, is very effective in suppressing accumulation of soluble phenols particularly at concentrations within the range 3–10 mg 1 −1 and enables the cells to continue growth although at a lower rate than in the presence of the active auxins. It is concluded that the activity of aryloxy-alkanecarboxylic acids as growth regulators for cells in culture involves their effects on cell metabolism not related to their activity as auxins.
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