Yvette Liénart

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The structure of the major component contained in a liquid seaweed extract prepared fromAscophyllum nodosum (Phaeophyta, Fucales) was investigated. The extract was fractionated by gel permeation chromatography, and the various fractions were analysed by GLC, HPLC,13C NMR spectroscopy and mass spectrometry. All fractions were derivatives of the branched(More)
Water extraction of semi-retted flax (Linum usitatissimum L.) fiber bundles yielded a mixture of pectic oligosaccharides and two acidic rhamnogalacturonide tetrasaccharides that were separated by size-exclusion chromatography. One- and two-dimensional nuclear magnetic resonance studies and fast atom bombardment-mass spectrometry experiments indicated that(More)
A lectin specific for glucosamine oligomers has been purified by chitosan affinity chromatography from cultured cells of Rubus. The lectin, eluted by a glucosamine oligomer of degree of polymerization 4 in the presence of l-α-phosphatidylserine dipalmitoyl, was found by sodium dodecyl sulfate-polyacrylamide gel electroploresis to be homogeneous and to have(More)
So far only little data have been available concerning the eliciting capacity of well defined glycan molecules isolated from plant pathogens. This study brings new information about changes in plant cells caused by fungal pathogens. Sugar fractions derived from glycoproteins isolated from the fungus Fusarium sp. M7-1 have been tested here as signaling(More)
Activation of the phenolic pathway is known to be part of a defense response against cell wall-derived elicitors from pathogens. Many examples of a defense response by increasing the synthesis of phenolic compound against the elicitor were demonstrated in the past, but the elicitor structure has so far been poorly characterized. Our results indicate that a(More)
An effective method for the preparation of purified cell walls from mesophyll cells of Valerianella olitoria has been developed. Cells were isolated by a mechanical procedure only and crude cell walls were prepared from cell homogenates. Crude wall suspensions were fractionated in a discontinuous sucrose gradient and the wall fragments recovered were(More)
The human blood-group determinants H-type 1 (α-l-Fuc-(1 → 2)-β-d-Gal-(1 → 3)β-d-GlcNAc), or type 2 (α-l-Fuc(1 → 2)-β-d-Gal(1 → 4)-β-d-GlcNAc) and their mono- and disaccharidic precursors, have been reported to induce d-glycanase (laminarinase) activity in Rubus cells (Y. Liénart et al. 1990, Plant Science 68, 197–202) and protoplasts (Y. Liénart et al.(More)
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