Lösliche Oligogalakturonide im Blattapoplasten unterschiedlich Ca-effizienter Kartoffelsorten bei Ca-Mangel

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Cutsem, “Calcium deficiency in potato (Solanum tuberosum ssp. tuberosum) leaves and its effects on the pectic composition of the apoplastic fluid

mogenates increased remarkably with Ca deficiency. Thus it appears that one major effect of Ca deficiency was a stimulaHowever, there was no close negative correlation between the tion of the activity of polygalacturonase, which could control extent of leaf damage and the total Ca content of the leaves. the breakdown of pectic polysaccharides in the cell wall. In order to obtain information about the Ca concentration in the apoplast fluid of the leaves, apoplastic washing fluid was Whether the release of potentially biologically active pectic fragments in cell walls might be involved in the occurrence of extracted by an infiltration-centrifugation technique. A low Ca supply reduced the Ca concentration both in the apoplast Ca-deficiency symptoms is discussed