title: Abscisic acid is not necessary for gravitropism in primary roots of Zea mays.
abstract: Primary roots of Zea mays L. cv. Tx 5855 treated with fluridone are strongly graviresponsive, but have undetectable levels of abscisic acid (ABA).  Primary roots of the carotenoid-deficient w-3, vp-5, and vp-7 mutants of Z. mays are also graviresponsive despite having undetectable amounts of ABA.  Graviresponsive roots of untreated and wild-type seedlings contain 286 to 317 ng ABA g-1 f. wt, respectively.  These results indicate that ABA is not necessary for root gravicurvature.
authors.affiliation: Department of Biological Sciences, Wright State University, Dayton, Ohio 45435.
authors.forename: R
authors.initials: R
authors.lastname: Moore
mesh_terms: D000040:Abscisic Acid / Q000032:analysis* / Q000037:antagonists & inhibitors / Q000502:physiology; D017343:Genes, Plant; D018522:Gravitropism / Q000502:physiology*; D006540:Herbicides / Q000494:pharmacology; D009154:Mutation; D018517:Plant Roots / Q000737:chemistry* / Q000187:drug effects / Q000235:genetics / Q000254:growth & development*; D011728:Pyridones / Q000494:pharmacology; D003313:Zea mays / Q000737:chemistry / Q000187:drug effects / Q000235:genetics / Q000254:growth & development
chemical_list: D006540:Herbicides; D011728:Pyridones; C013351:fluridone; D000040:Abscisic Acid