Impairment of Photorespiratory Carbon Flow into Rubber by the Inhibition of the Glycolate Pathway in Guayule (Parthenium argentatum Gray).
Plant Physiol
; 84(4): 1447-50, 1987 Aug.
Article
em En
| MEDLINE
| ID: mdl-16665625
ABSTRACT
Cut shoots of guayule (Parthenium argentatum Gray) were treated with four inhibitors of the glycolate pathway (alpha-hydroxypyridinemethanesulfonic acid; isonicotinic acid hydrazide, glycine hydroxamate, and amino-oxyacetate, AOA) in order to evaluate the role of photorespiratory intermediates in providing precursors for the biosynthesis of rubber. Photorespiratory CO(2) evolution in guayule leaves was severely inhibited by AOA. Application of each of the four inhibitors has resulted in a significantly decreased incorporation of (14)C into rubber fractions suggesting that the glycolate pathway is involved in the biosynthesis of rubber in guayule. However, the application of each of the glycolate pathway inhibitors showed no significant effect on photosynthetic CO(2) fixation in the leaves. The inhibitors individually also reduced the incorporation of labeled glycolate, glyoxylate, and glycine into rubber, while the incorporation of serine and pyruvate was not affected. The effective inhibition of incorporation of glycolate pathway intermediates in the presence of AOA was due to an inhibition of glycine decarboxylase and serine hydroxymethyltransferase. It is concluded that serine is a putative photorespiratory intermediate in the biosynthesis of rubber via pyruvate and acetyl coenzyme A.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Plant Physiol
Ano de publicação:
1987
Tipo de documento:
Article
País de afiliação:
Índia