Linked Life Data

16666907

Source:http://linkedlifedata.com/resource/pubmed/id/16666907

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2010-6-29
pubmed:abstractText
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-[(3)H]glucuronic acid for 30 minutes, the accumulated UDP-[(3)H]apiose pool accounted for about 27% of the total phosphorylated [(3)H]pentose derivatives; in turions, the UDP-[(3)H]apiose pool accounted for only about 4% of the total phosphorylated [(3)H]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.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jul
pubmed:issn
0032-0889
pubmed:author
pubmed:issnType
Print
pubmed:volume
90
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
972-6
pubmed:dateRevised
2010-9-14
pubmed:year
1989
pubmed:articleTitle
Developmental Control of Apiogalacturonan Biosynthesis and UDP-Apiose Production in a Duckweed.
pubmed:affiliation
Department of Botany, University of Edinburgh, The King's Buildings, Mayfield Road, Edinburgh, EH9 3JH, United Kingdom.
pubmed:publicationType
Journal Article