Growth, graviresponsiveness and abscisic-acid content of Zea mays seedlings treated with Fluridone

Randy Moore, James D. Smith

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Ten-d-old seedlings of Zea mays L. cv. Tx 5855 treated with 1-methyl-3-phenyl-5-(3-[trifluoromethyl]phenyl)-4-(1 H)-pyridinone (Fluridone) were analyzed for abscisic acid (ABA) content using high-performance liquid chromatography with an analysis sensitivity of 2.5 ng ABA g-1 fresh weight (FW). Seedlings were divided into three portions: leaves, detipped roots, and root tips (terminal 1.5 mm). Control plants (water treatment only; no Fluridone) were characterized by the following amounts of ABA: leaves, 0.114±0.024 (standard deviation) μg ABA g-1 FW; detipped roots, 0.260±0.039±μg ABA g-1 FW; root tips, no ABA detected. We did not detect any ABA in tissues of Fluridone-treated plants. Primary roots of treated and untreated seedlings were strongly graviresponsive, with no significant differences between the curvatures or the growth rates of primary roots of Fluridone-treated and control seedlings. These results indicate that 1) Fluridone completely inhibits ABA synthesis, and 2) ABA is not necessary for positive gravitropism by primary roots of Zea mays.

Original languageEnglish (US)
Pages (from-to)342-344
Number of pages3
JournalPlanta
Volume162
Issue number4
DOIs
StatePublished - Oct 1 1984

Keywords

  • Abscisic acid and root growth
  • Fluridone
  • Gravitropism (root)
  • Root growth
  • Zea (root growth)

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