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ON THE GELATION OF PECTIN BY PLANT EXTRACTS AND ITS INHIBITION SOME CONSIDERATIONS IN RELATION TO HOSTPARASITE INTERACTIONS
Author(s) -
FUCHS A.
Publication year - 1965
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1965.tb00197.x
Subject(s) - pectin , chemistry , tannic acid , enzyme , quinoline , biochemistry , pectinesterase , demethylation , pectinase , organic chemistry , gene expression , dna methylation , gene
A bstract Gelation of pectin by plant extracts is due to demethylation by pectin methylesterase; in the presence of Caions Ca‐pectate gels are formed. Pectin methylesterase is inhibited to some extent by 1,2‐dihydroxy‐anthraquinone‐sulphonic acid‐3, 1,4‐dihydroxy‐anthraquinone‐sulphonic acid‐2, and 8‐hydroxy‐quinoline sulphate, but much stronger by m‐digallic acid and tannic acid. A trans‐eliminative breakdown of pectin can interfere with the action of pectin methylesterase. In host‐parasite complexes, the degradation of pectin (either hydrolytically or trans‐eliminatively) can be catalyzed by many different enzymes of plant, fungal or bacterial origin. Various substances, occurring naturally in higher plants, can greatly affect >the activity of these enzymes. Therefore, in order to obtain quantitative data on their respective activities in host‐parasite systems, thorough purification of all pectolytic enzymes from such systems is indispensable.