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Ph dependent interactions between pea pisum sativum cultivar alaska cell wall polymers possibly involved in wall deposition and growth



Ph dependent interactions between pea pisum sativum cultivar alaska cell wall polymers possibly involved in wall deposition and growth



Plant Physiology (Rockville) 68(1): 158-164



In an effort to detect a pH-dependent release of polymers such as xyloglucans, thought to be involved in auxin-induced cell wall expansion during growth, radioactively labeled cell walls from pea stem tissue were incubated at different pH values and changes in water-soluble, ethanol- or trichloroacetic acid-insoluble components were determined. This revealed the occurrence, at neutral pH, of a time- and pH-dependent binding of soluble pectin, in the walls, to a heat-labile, presumably protein, wall component, yielding a trichloroacetic acid-insoluble pectin-protein complex. This reaction, which can be observed between polymers in water extracts of cell walls, is inhibited at low pH and by Ca2+ and appears to be of a physical, possibly lectin-like, nature. Progressive binding of pectin or of the pectin-protein complex to the insoluble wall structure is observed. These reactions may be involved in wall assembly during its deposition and may participate in, or be analogous to pH-dependent physical interactions that participate in, wall extension during cell growth.

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Accession: 006091813

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