The susceptibility of tissue cell walls toErwinia enzymes differs among the potato cultivars |
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Authors: | C Wegener G Jansen |
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Institution: | 1. Federal Centre for Breeding Research on Cultivated Plants, Institute for Stress Physiology and Quality of Raw Material, D-18190, Gro? Lüsewitz, Germany
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Abstract: | Summary In the cell wall matrix of higher plants, cellulose fibrils are embedded in a network of pectic substances, hemicelluloses
and structural proteins. But plant pathogenicErwinia carotovora bacteria secrete a mixture of enzymes including pectinases, cellulases and proteases to degrade the cell walls of host plant
tissue. Tuber tissue of 31 potato genotypes was exposed to a mixture ofErwinia enzymes before the degree of cell wall lysis was determined by a Neutral-red vital staining method. The data indicate that
the resistance of cell walls to the action ofErwinia enzymes differed significantly among the potato cultivars and clones. The decrease in cell viability caused by the action
of enzymes ranged from 7% for cv. Maxilla to >46% for cv. Arnika. An increased rate of N-fertilization coincided with enhanced
susceptibility of cell walls to the action ofErwinia enzymes. There was a correlation between the amount of cell wall substances in tuber tissue and the resistance of cell walls
to enzymic degradation. |
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Keywords: | Erwinia carotovora soft-rot tuber tissue cell lysis Solanum tuberosum L |
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