Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Abscisic Acid, Abscisic Acid-Esters and Phaseic Acid in Vegetative Terminal Buds of Acer pseudoplatanus during Emergence from Winter Dormancy

I.D.J. Phillips and A. Hofmann
Planta
Vol. 146, No. 5 (1979), pp. 591-596
Published by: Springer
Stable URL: http://www.jstor.org/stable/23374401
Page Count: 6
  • More info
  • Cite this Item
Abscisic Acid, Abscisic Acid-Esters and Phaseic Acid in Vegetative Terminal Buds of Acer pseudoplatanus during Emergence from Winter Dormancy
Preview not available

Abstract

Levels of free-abscisic acid and "bound-abscisic acid" (alkaline hydrolyzable abscisic acidesters) in replicated samples of terminal vegetative buds of sycamore trees were measured during natural emergence from winter dormancy by gas chromatographic methods together with isotope dilution estimation of recovery rates. Not until after the buds had been released from true dormancy in January by winter chilling did any clear change occur in either abscisic acid (ABA) fraction, or in total ABA, on any basis of comparison. The percentage of total ABA present as the free acid declined at the end of true dormancy to approximately two-thirds of its value in the earlier winter months. It is concluded that glucosylation of ABA is unlikely to play a major part in the mechanism of release from dormancy in vegetative sycamore buds. At the end of true dormancy there was a large transient increase in what appeared to be phaseic acid, but this was not accompanied by any marked decrease in either free- or bound-ABA.

Page Thumbnails

  • Thumbnail: Page 
[591]
    [591]
  • Thumbnail: Page 
592
    592
  • Thumbnail: Page 
593
    593
  • Thumbnail: Page 
594
    594
  • Thumbnail: Page 
595
    595
  • Thumbnail: Page 
596
    596