, Volume 162, Issue 4, pp 342–344 | Cite as

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

  • Randy Moore
  • James D. Smith


Ten-d-old seedlings of Zea mays L. cv. Tx 5855 treated with 1-methyl-3-phenyl-5-(3-[trifluoromethyl]phenyl)-4-(1H)-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.

Key words

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



abscisic acid




fresh weight


standard deviation


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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Randy Moore
    • 1
    • 2
  • James D. Smith
    • 1
    • 2
  1. 1.Department of BiologyBaylor UniversityWacoUSA
  2. 2.Department of Soil and Crop ScienceTexas A and M UniversityCollege StationUSA

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