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- W1992300955 abstract "Abstract Chemically modified citrus pectin and native pectin were compared as inducers of differentiation in zoospores of the plant pathogen Phytophthora palmivora . Periodate oxidation or reduction of pectin completely destroyed all capacity of the polymer to induce cell differentiation. Methylation destroyed the capacity of the pectin to induce germination, but the methylated polysaccharide induced zoospore rounding and at least partial encystment at low concentrations. Some oligomers prepared from a partial pectinase digest of citrus pectin also induced zoospore differentiation, with tetra-, and pentasaccharides proving the most effective. These results suggest that free galacturonate residues in pectin are critical to the induction of complete zoospore differentiation, although the process can be initiated, but not completed, by a wider range of compounds. The use of K + in lieu of Tris—pectin resulted in an extended lag before pectin-induced differentiation began. However, after 90 min, no differences were observed between cells stimulated by potassium pectate and those stimulated by Tris—pectate. Dialysis of the native pectin reduced its efficiency as an inducer, but addition of the ashed dialysate to the dialysed pectin partially restored its capacity to induce zoospore differentiation." @default.
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- W1992300955 date "1990-01-01" @default.
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- W1992300955 title "The effect of modified pectin, pectin fragments and cations on Phytophthora palmivora zoospores" @default.
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- W1992300955 doi "https://doi.org/10.1016/0031-9422(90)80003-y" @default.
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