PURINE NUCLEOTIDE METABOLISM IN PEACH TREE BUDS: CHARACTERIZATION OF DORMANCY RELEASE AND GROWTH ABILITY "MARKER ENZYMES"

ISHS Acta Horticulturae 465: IV International Peach Symposium

PURINE NUCLEOTIDE METABOLISM IN PEACH TREE BUDS: CHARACTERIZATION OF DORMANCY RELEASE AND GROWTH ABILITY "MARKER ENZYMES"

Authors:	I. Lecomte, F. Faye, F. Le Floc'h
Keywords:	adenosine kinase, adenosine nucleosidase, adenine phosphoribosyltransferase, dormancy release, budbreak
DOI:	10.17660/ActaHortic.1998.465.65
Abstract: In higher plants, a relationship exists between the regulation of the nucleoside triphosphate content following an exogenous adenosine treatment and bud growth ability (Nucleotide Test). In peach tree, adenosine may be recycled into adenine nucleotides by direct phosphorylation into AMP by a specific and very active kinase or by successive intervention of a nucleosidase and an adenine phosphoribosyltransferase. Recycling of adenosine should occur by the indirect cytosolic pathway while adenosine kinase should operate solely inside organelles. The examination of time course activities of these enzymes during autumn-winter period in peach buds shows: high increases of adenosine kinase specific activities through January in flower buds and at the end of February in vegetative buds just as they acquire the ability to grow; progressive increases of adenine phosphoribosyltransferase specific activities from the middle of December to the end of February in both bud types during post-dormancy; transient increases of adenosine nucleosidase specific activities in the course of September to December, followed by a rapid decrease at dormancy release in both vegetative and flower buds. In peach, adenosine nucleosidase and adenosine kinase could be considered as "marker enzymes" of dormancy release and growth ability respectively.
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