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Collection of gravitropic effectors from mucilage of electrotropically-stimulated roots of Zea mays LWe 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).
Document ID
Document Type
Reprint (Version printed in journal)
Fondren, W. M. (Baylor University Waco, TX 76798, United States)
Moore, R.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Annals of botany
Volume: 59
ISSN: 0305-7364
Subject Category
Life Sciences (General)
Distribution Limits
NASA Discipline Number 40-10
NASA Program Space Biology
NASA Discipline Plant Biology
Non-NASA Center