Developmental control of apiogalacturonan biosynthesis and UDP-apiose production in a duckweed

Vegetative fronds of Spirodela polyrrhiza were induced to form dormant turions by the addition of 1 micromolar abscisic acid or by shading. The cell wall polymers of fronds contained a high proportion of the branched-chain pentose, D-apiose (about 20% of total noncellulosic wall sugar residues), whe...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1989-07, Vol.90 (3), p.972-976
Main Authors: Longland, J.M. (University of Edinburgh, Edinburgh, United Kingdom), Fry, S.C, Trewavas, A.J
Format: Article
Language:English
Subjects:
551001 - Physiological Systems- Tracer Techniques
ACIDE ABSCISSIQUE
ACIDO ABSCISICO
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
AQUATIC ORGANISMS
BASIC BIOLOGICAL SCIENCES
Biological and medical sciences
BIOSINTESIS
BIOSYNTHESE
Biosynthesis
BOURGEON
CARBOHYDRATES
CARBON 14 COMPOUNDS
Cell biochemistry
CELL CONSTITUENTS
Cell physiology
CELL WALL
Cell wall components
Cell walls
CHEMICAL COMPOSITION
COMPOSICION
COMPOSITION
Development and Growth Regulation
Electrophoresis
ENSAYO
ENZYME ACTIVITY
Fundamental and applied biological sciences. Psychology
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LEMNACEAE
OMBRAGE
ORGANIC COMPOUNDS
Paper chromatography
PARED CELULAR
PAROI CELLULAIRE
PHYSIOLOGY
Plant physiology and development
Plants
POLISACARIDOS
POLYHOLOSIDE
POLYSACCHARIDES
Radioactive decay
SACCHARIDES
Sugars
TESTAGE
TRACER TECHNIQUES
TRITIUM COMPOUNDS
UMBRIA
WEEDS
YEMA (PLANTA)
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Summary:Vegetative fronds of Spirodela polyrrhiza were induced to form dormant turions by the addition of 1 micromolar abscisic acid or by shading. The cell wall polymers of fronds contained a high proportion of the branched-chain pentose, D-apiose (about 20% of total noncellulosic wall sugar residues), whereas turion cell walls contained only trace amounts (about 0.2%). When the fronds were fed D-[3H]glucuronic acid for 30 minutes, the accumulated UDP-[3H]apiose pool accounted for about 27% of the total phosphorylated [3H]pentose derivatives; in turions, the UDP-[3H]apiose pool accounted for only about 4% of the total phosphorylated [3H]pentose derivatives. We conclude that the developmentally regulated decrease in the biosynthesis of a wall polysaccharide during turion formation involves a reduction in the supply of the relevant sugar nucleotide. One controlling enzyme activity is suggested to be UDP-apiose/UDP-xylose synthase. However, since there was a 100-fold decrease in the rate of polysaccharide synthesis and only a 9-fold decrease in UDP-apiose accumulation, there is probably also control of the activity of the relevant polysaccharide synthase
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.90.3.972