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Two distinct regions of response drive differential growth in Vigna root electrotropismAlthough exogenous electric fields have been reported to influence the orientation of plant root growth, reports of the ultimate direction of differential growth have been contradictory. Using a high-resolution image analysis approach, the kinetics of electrotropic curvature in Vigna mungo L. roots were investigated. It was found that curvature occurred in the same root toward both the anode and cathode. However, these two responses occurred in two different regions of the root, the central elongation zone (CEZ) and distal elongation zone (DEZ), respectively. These oppositely directed responses could be reproduced individually by a localized electric field application to the region of response. This indicates that both are true responses to the electric field, rather than one being a secondary response to an induced gravitropic stimulation. The individual responses differed in the type of differential growth giving rise to curvature. In the CEZ, curvature was driven by inhibition of elongation, whereas curvature in the DEZ was primarily due to stimulation of elongation. This stimulation of elongation is consistent with the growth response of the DEZ to other environmental stimuli.
Document ID
20040088660
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Wolverton, C.
(The Ohio State University Columbus, OH 43210, United States)
Mullen, J. L.
Ishikawa, H.
Evans, M. L.
Date Acquired
August 21, 2013
Publication Date
November 1, 2000
Publication Information
Publication: Plant, cell & environment
Volume: 23
Issue: 11
ISSN: 0140-7791
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG2-1190
CONTRACT_GRANT: NGT5-50015
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Plant Biology

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