Chitinase in bean leaves: induction by ethylene, purification, properties, and possible function View Full Text


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Article Info

DATE

1983-02

AUTHORS

T. Boller, A. Gehri, F. Mauch, U. Vögeli

ABSTRACT

Ethylene induced an endochitinase in primary leaves of Phaseolus vulgaris L. The enzyme formed chitobiose and higher chitin oligosaccharides from insoluble, colloidal or regenerated chitin. Less than 5% of the total chitinolytic activity was detected in an exochitinase assay proposed by Abeles et al. (1970, Plant Physiol. 47, 129–134) for ethylene-induced chitinase. In ethylene-treated plants, chitinase activity started to increase after a lag of 6 h and was induced 30 fold within 24 h. Exogenously supplied ethylene at 1 nl ml−1 was sufficient for half-maximal induction, and enhancement of the endogenous ethylene formation also enhanced chitinase activity. Cycloheximide prevented the induction. Among various hydrolases tested, only chitinase and, to a lesser extent, β-1,3-glucanase were induced by ethylene. Induction of chitinase by ethylene occurred in many different plant species. Ethylene-induced chitinase was purified by affinity chromatography on a column of regenerated chitin. Its apparent molecular weight obtained by sodium dodecyl sulfate-gel electrophoresis was 30,000; the molecular weight determined from filtration through Sephadex G-75 was 22,000. The purified enzyme attacked chitin in isolated cell walls of Fusarium solani. It also acted as a lysozyme when incubated with Micrococcus lysodeikticus. It is concluded that ethylene-induced chitinase functions as a defense enzyme against fungal and bacterial invaders. More... »

PAGES

22-31

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00394536

DOI

http://dx.doi.org/10.1007/bf00394536

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1024658349

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24263941


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