| Abstract: | The effects on cell division and cell size of indole-3-aceticacid (IAA), gibberellic acid (GA), and kinetin were studiedin liquid suspension cultures of cambial cells derived fromAcer pseudoplatanus. It was shown that all three hormones promotecell division and that the effects of both GA and kinetin areadditive to those of IAA, but the effects of GA and kinetintogether are not additive. Treatment with IAA resulted in anincrease of mean cell size (indicating that cell expansion ispromoted), but after GA or kinetin treatment the mean cell sizewas smaller, indicating that little cell expansion had takenplace after each division. The results are discussed in relationto previous work on the effects of hormones in the intact cambiumand to current theories on the interactions of growth hormones. |
