A Sycamore Cell Wall Polysaccharide and a Chemically Related Tomato Leaf Polysaccharide Possess Similar Proteinase Inhibitor-Inducing Activities
- 1 September 1981
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 68 (3), 616-618
- https://doi.org/10.1104/pp.68.3.616
Abstract
A large pectic polysaccharide, called rhamnogalacturonan I, that is solubilized by a fungal endo-α-1,4-polygalacturonase from the purified walls of suspension-cultured sycamore cells possesses proteinase inhibitor-inducing activity similar to that of the proteinase inhibitor-inducing factor, a pectic-like oligosaccharide fraction isolated from tomato leaves. This suggests that the proteinase inhibitor-inducing activity resides in particular polysaccharide fragments which can be released when plant cell walls are exposed to appropriate enzyme degradation as a result of either wounding or pest attack.This publication has 12 references indexed in Scilit:
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