Hormonal Control of Root Georeaction: Some Light Effects

  • P. E. Pilet
Part of the Proceedings in Life Sciences book series (LIFE SCIENCES)

Abstract

In darkness, when kept in horizontal position, primary roots of a few plants do not geo-react (4) or only bend slowly (18), whereas exposed to light they respond promptly. This is because light induces the formation (17, 31, 32, 33), in the cap, of growth inhibitors which then accumulate in the lower part of a horizontally oriented root, decreasing its elongation relative to the upper part (11, 16) and thus causing downward curvature. While these inhibitors are produced only in light, the actual georeaction can occur in the dark (14, 15, 29). According to unpublished data of G.S.B. Gibbons and M.B. Wilkins (32), the light-induced positive geotropic sensitivity of maize roots is only temporary.

Keywords

Maize Agar Dura 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1980

Authors and Affiliations

  • P. E. Pilet
    • 1
  1. 1.Institute of Plant Biology and Physiology of the UniversityLausanneSwitzerland

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