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Cytochemical localization of calcium in cap cells of primary roots of Zea mays LThe cellular distribution of Ca in caps of primary roots of Zea mays was examined during the onset and early stages of gravicurvature to determine its possible role in root gravitropism. Staining becomes associated with the portion of the cell wall adjacent to the distal end of the cell after five minutes, and persists throughout the onset of gravicurvature. The outermost peripheral cells of roots oriented horizontally and vertically secrete Ca through plasmodesmata-like channels in their cell walls. Data suggest that Ca is not transported laterally through the columella tissue,but rather that the movement of Ca to the lower side of caps of horizontally-oriented roots is at least partially through and/or on the mucilage of the cap, and via an electrochemical gradient. An important role in root gravitropism is indicated for Ca secretion by peripheral cells.
Document ID
19860045680
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Moore, R.
(Baylor University Waco, TX, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1985
Publication Information
Publication: Physiologist, Supplement
Volume: 28
ISSN: 0031-9376
Subject Category
Life Sciences (General)
Accession Number
86A30418
Distribution Limits
Public
Copyright
Other

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