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Collection of gravitropic effectors from mucilage of electrotropically-stimulated roots of Zea mays L.

Authors
  • Fondren, W M
  • Moore, R
Type
Published Article
Journal
Annals of botany
Publication Date
Jan 01, 1987
Volume
59
Pages
657–659
Identifiers
PMID: 11539728
Source
Medline
Keywords
License
Unknown

Abstract

We placed agar blocks adjacent to tips of electrotropically stimulated primary roots of Zea mays. Blocks placed adjacent to the anode-side of the roots for 3 h induced significant curvature when subsequently placed asymmetrically on tips of vertically-oriented roots. Curvature was always toward the side of the root unto which the agar block was placed. Agar blocks not contacting roots and blocks placed adjacent to the cathode-side of electrotropically stimulated roots did not induce significant curvature when placed asymmetrically on tips of vertically-oriented roots. Atomic absorption spectrophotometry indicated that blocks adjacent to the anode-side of electrotropically-stimulated roots contained significantly more calcium than (1) blocks not contacting roots, and (2) blocks contacting the cathode-side of roots. These results demonstrate the presence of a gradient of endogenous Ca in mucilage of electrotropically-stimulated roots (i.e. roots undergoing gravitropic-like curvature).

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