The Effect of Growth Hormones on Cell Division and Expansion in Liquid Suspension Cultures ofAcer pseudoplatanus

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Abstract
The effects on cell division and cell size of indole-3-acetic acid (IAA), gibberellic acid (GA), and kinetin were studied in liquid suspension cultures of cambial cells derived from Acer pseudoplatanus. It was shown that all three hormones promote cell division and that the effects of both GA and kinetin are additive to those of IAA, but the effects of GA and kinetin together are not additive. Treatment with IAA resulted in an increase of mean cell size (indicating that cell expansion is promoted), but after GA or kinetin treatment the mean cell size was smaller, indicating that little cell expansion had taken place after each division. The results are discussed in relation to previous work on the effects of hormones in the intact cambium and to current theories on the interactions of growth hormones.