title: Evaluation of ethylene as a mediator of gravitropism by tomato hypocotyls.
abstract: Assessments of the participation of ethylene in gravitropism by hypocotyls of tomato (Lycopersicon esculentum Mill.) indicate that gravitropism can occur without substantial change in ethylene production.  Moreover, lowering or evaluating ethylene over a considerable range, as well as inhibiting ethylene action, fails to influence gravitropic bending.  This vitiates the possibility that ethylene is a mediator of the primary, negative gravitropic response of tomato shoots.
authors.affiliation: Biology Department, Washington University, Saint Louis, Missouri 63130, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Harrison
authors.forename: B G
authors.initials: BG
authors.lastname: Pickard
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D000598:Amino Acids, Cyclic; D003035:Cobalt / Q000494:pharmacology; D005030:Ethylenes / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000378:metabolism* / Q000494:pharmacology; D005998:Glycine / Q000031:analogs & derivatives / Q000494:pharmacology; D006112:Gravitation; D018522:Gravitropism / Q000187:drug effects / Q000502:physiology*; D018546:Hypocotyl / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D018551:Solanum lycopersicum / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D012399:Rotation; D013997:Time Factors
chemical_list: D000596:Amino Acids; D000598:Amino Acids, Cyclic; D005030:Ethylenes; D003035:Cobalt; C023863:1-aminocyclopropane-1-carboxylic acid; C036216:ethylene; C018021:cobaltous chloride; C088137:aminoethoxyvinylglycine; D005998:Glycine