The regulation of Avena coleoptile growth by abscisic acid and indoleacetic acid

Philipson, John Julian (1973) The regulation of Avena coleoptile growth by abscisic acid and indoleacetic acid. PhD thesis, University of Glasgow.

Abstract

This thesis presents an investigation into the regulation of cell elongation in coleoptiles segments of Avena sativa. The mode of action of the inhibitor abscisic acid has been examined and a survey of the biological activity of plant growth inhibitors, of potential commercial importance, has been carried out. Abscisic acid induces a non-toxic inhibition of cell elongation in the Avena coleoptile straight growth assay. The use of ASA-analogues has elucidated certain molecular requirements for the inhibitory activity of ABA. The complete carbon skeleton of the 2,4-pentadiene side chain appears to be essential for inhibition and, provided this is present, there are two active moieties in the ABA molecule, viz. the ring double bond and an oxygen or nitrogen containing functional group at C-1 in the side chain. The carbonyl and hydroxyl groups attached to the ring appear unnecessary for inhibitory activity. Although 33 ABA-analogues were bioassayed none was more inhibitory than ABA itself. In view of the importance attached to the promotory effects of indole acetic acid on cell elongation the effect of ABA, in the presence of IAA, was examined. ABA overcomes the stimulation of growth by IAA and on a mole for mole basis, at 10.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Additional Information: Adviser: M B Wilkins
• Keywords: Plant sciences
• Date of Award: 1973
• Depositing User: Enlighten Team
• Unique ID: glathesis:1973-72836
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 11 Jun 2019 11:06
• Last Modified: 11 Jun 2019 11:06
• URI: https://theses.gla.ac.uk/id/eprint/72836