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Root elongation against a constant force: experiment with a computerized feedback-controlled deviceAxial force was applied to the root tip of corn (Zea mays L. cv. Merit) seedlings using a computerized, feedback-controlled mechanical device. The system's feedback capability allowed continuous control of a constant tip load, and the attached displacement transducer provided the time course of root elongation. Loads up to 7.5 g decreased the root elongation rate by 0.13 mm h-1 g-1, but loads 7.5 to 17.5 g decreased the growth rate by only 0.04 mm h-1 g-1. Loads higher than 18 g stopped root elongation completely. Measurement of the cross-sectional areas of the root tips indicated that the 18 g load had applied about 0.98 MPa of axial pressure to the root, thereby exceeding the root's ability to respond with increased turgor pressure. Recorded time-lapse images of loaded roots showed that radial thickening (swelling) occurred behind the root cap, whose cross-sectional area increased with tip load.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Kuzeja, P. S.
(Mount Holyoke College South Hadley, Massachusetts 01075, United States)
Lintilhac, P. M.
Wei, C.
Date Acquired
August 21, 2013
Publication Date
May 1, 2001
Publication Information
Publication: Journal of plant physiology
Volume: 158
Issue: 5
ISSN: 0176-1617
Subject Category
Life Sciences (General)
Distribution Limits
Non-NASA Center
NASA Discipline Plant Biology

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