, Volume 167, Issue 1, pp 94–100 | Cite as

The induction of contractile roots in Gladiolus grandiflorus

  • A. H. Halevy


The number of contractile roots formed in gladioli was inversely related to the depth of the planted corm. Below a certain depth, no contractile roots were produced. Large corms did not produce contractile roots at any planting depth but produced two or more small corms. Depth perception is a function of two independent mechanisms, namely, temperature fluctuations in the root-initiation zone and the amount of light perceived mainly by the upper sheath leaf, the length of which varies with planting depth. Various growth substances applied to the leaves or corms did not induce contractile roots in dark-grown plants but roots were induced by indole-3-butyric acid in both small and large corms grown at constant temperatures and light. Abscisic acid retarded the formation of contractile roots under inductive conditions.

Key words

Auxin (IBA) and contractile roots Depth perception Gladiolus Light and contractile roots Root, contractile Temperature and contractile roots 



contractile root(s)


indole-3-butyric acid


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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • A. H. Halevy
    • 1
  1. 1.Department of Ornamental HorticultureHebrew University of JerusalemRehovotIsrael

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