Phenolic synthesis and phenylalanine ammonia-lyase activity in suspension cultures of Acer pseudoplatanus L. View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1976-01

AUTHORS

R. J. Westcott, G. G. Henshaw

ABSTRACT

Phenolic metabolism is influenced by the levels of sucrose, nitrogen and 2,4 dichlorophenoxyacetic acid (2,4-D) in the growth medium. Chromatographic evidence suggests that the principle products are polymers of leucocyanin, (-) epicatechin and (+) catechin, constituting condensed tannins. Comparison of ethanolic cell extracts with extracts from plant organs shows that although these compounds are present in parts of the plant they are not the major phenolics.Cells maintained in a modified Heller's medium containing 9.0×10(-7) M 2,4-D produce increased levels of tannins from mid passage (day 12) onwards. The presence of 2,4-D at 9.0×10(-6) M supresses this response and increased initial sucrose levels cause the amount of tannins to be greater. At the period when tannin levels increase the standard medium is exhaused of its nitrogen sources, urea and nitrate. Increased initial nitrogen levels delay the beginning of increased tannin production and the addition of urea or 2,4-D to cultures already containing high levels of tannins causes the tannin content per gram fresh weight and per culture to decline. These results indicate an antagonism between tannin synthesis and nitrogen metabolism. The activity of phenylalanine ammonia-lyase EC 4.1.1.5. (PAL) estimated by a spectrophotometric method in acetone powders derived from Acer cells increases three to four fold at the onset of increased tannin synthesis and then declines sharply. The phase of high PAL activity correlates with the exhausion of the medium nitrogen sources. More... »

PAGES

67-73

Journal

TITLE

Planta

ISSUE

1

VOLUME

131

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00387347

DOI

http://dx.doi.org/10.1007/bf00387347

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006986213

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24424697


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