PLANT PHYSIOLOGY , Vol 102, Issue 2 541-545, Copyright © 1993 by American Society of Plant Biologists
|
DEVELOPMENT AND GROWTH REGULATION |
Identification of a Benzyladenine Disaccharide Conjugate Produced during Shoot Organogenesis in Petunia Leaf Explants
C. A. Auer and J. D. Cohen
Department of Plant Science, University of Connecticut, Storrs, Connecticut 06269 (C.A.A.)
Prior studies of benzyladenine (BA) metabolism in Petunia hybrida Vilm.
leaf explants during shoot organogenesis revealed the presence of an
abundant unidentified BA conjugate. The BA conjugate, compound C, made up
to 39% of the total pool of BA conjugates in two Petunia lines and was
associated with an increased shoot organogenic response when compared with
a third Petunia line that did not produce any compound C. Structural
analysis of compound C utilizing fast atom bombardment mass spectrometry,
two methods of carbohydrate analysis, ultraviolet absorption spectra, and
Fourier transform infrared spectra identified it as a new cytokinin
conjugate,
6-benzylamino-9-[O-gluco-pyranosyl-(1->3)-ribofuranosyl]-purine. Based
on our prior biological studies and the similarity of this compound to
related cytokinin conjugates, this disaccharide cytokinin conjugate may be
part of the interconvertible pool of cytokinins active in Petunia shoot
organogenesis.