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Inducing gravitropic curvature of primary roots of Zea mays cv AgeotropicPrimary roots of the mutant 'Ageotropic' cultivar of Zea mays are nonresponsive to gravity. Their root caps secrete little or no mucilage and touch the root only at the extreme apex. A gap separates the cap and root at the periphery of the cap. Applying mucilage from normal roots or substances with a consistency similar to that of mucilage to tips of mutant roots causes these roots to become strongly graviresponsive. Gravicurvature stops when these substances are removed. Caps of some mutants secrete small amounts of mucilage and are graviresponsive. These results indicate that (a) the lack of graviresponsiveness in the mutant results from disrupting the transport pathway between the cap and root, (b) movement of the growth-modifying signal from the cap to the root occurs via an apoplastic pathway, and (c) mucilage is necessary for normal communication between the root cap and root in Zea mays cv Ageotropic.
Document ID
20040090227
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Moore, R.
(Wright State University Dayton, Ohio 45435, United States)
Evans, M. L.
Fondren, W. M.
Date Acquired
August 21, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Plant physiology
Volume: 92
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DMB8608673
CONTRACT_GRANT: NAGW-297
CONTRACT_GRANT: NAGW-1738
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 29-20
NASA Discipline Plant Biology
Non-NASA Center
NASA Program Space Biology

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