Springback in root gravitropism.
Conditions under which a gravistimulus of Merit corn roots (Zea mays L.) is withdrawn result in a subsequent loss of gravitropic curvature, an effect which we refer to as  springback.'  This loss of curvature begins within 1 to 10 minutes after removal of the gravistimulus.  It occurs regardless of the presence or absence of the root cap.  It is insensitive to inhibitors of auxin transport (2,3,5-triiodobenzoic acid, naphthylphthalamic [correction of naphthylphthalmaic] acid) or to added auxin (2,4-dichlorophenoxyacetic acid).  Springback is prevented if a clinostat treatment is interjected to neutralize gravistimulation during germination, which suggests that the change in curvature is a response to a  memory' effect carried over from a prior gravistimulation.
Leopold
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Boyce Thompson Institute, Cornell University, Ithaca, New York 14853.
Wettlaufer
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D015084:2,4-Dichlorophenoxyacetic Acid / Q000494:pharmacology; D018525:Germination; D006112:Gravitation; D018522:Gravitropism / Q000187:drug effects / Q000502:physiology*; D006540:Herbicides / Q000494:pharmacology; D007210:Indoleacetic Acids / Q000037:antagonists & inhibitors; D008027:Light; D010797:Phthalimides / Q000494:pharmacology; D018518:Plant Root Cap / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development* / Q000502:physiology*; D012399:Rotation; D013997:Time Factors; D014283:Triiodobenzoic Acids / Q000494:pharmacology; D003313:Zea mays / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*
D006540:Herbicides; D007210:Indoleacetic Acids; D010797:Phthalimides; D014283:Triiodobenzoic Acids; D015084:2,4-Dichlorophenoxyacetic Acid; C002687:alpha-naphthylphthalamic acid