Springback and diagravitropism in Merit corn roots.
Dark-treated Merit corn (Zea mays L.) roots are diagravitropic and lose curvature upon withdrawal of the gravity stimulus (springback).  Springback was not detected in a variety of corn that is orthogravitropic in the dark, nor in Merit roots in which tropistic response was enhanced either with red light or with abscisic acid.  A possible interpretation is that springback may be associated with a weak growth response of diagravitropic roots.
Kelly
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Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York 14853.
Leopold
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D000040:Abscisic Acid / Q000494:pharmacology; D003624:Darkness; D006112:Gravitation; D018522:Gravitropism / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D008027:Light; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development* / Q000502:physiology; D012399:Rotation; D013997:Time Factors; D003313:Zea mays / Q000187:drug effects / Q000254:growth & development* / Q000502:physiology
D000040:Abscisic Acid