Abstract
Growth of excised roots of tomato in glucose, fructose or sucrose suggested a relationship between growth and invertase activity. When growth was reduced by low temperature, invertase activity remained high and reflected the sucrose concentration of the medium. Altering growth rate by altering the sucrose concentration caused a change in invertase activity earlier than a change in growth rate. 1-Naphthalene acetic acid (NAA), gibberellic acid (GA) and kinetin did not affect growth or invertase activity. Abscisic acid (ABA) inhibited growth and caused a reduction in the specific activity of invertase.
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