Laboratoires Goemar S.a.

Bayer Cropscience S.a.

Bernard Fritig

Jean-Claude Yvin

Bernard Cloarec

Jean-Marie Joubert

Bertrand Plesse

Marguerite Kopp

Marie-Pascale Latorse

Gilbert Labourdette

Tristan Barbeyron

Florence Cruz

Christophe Richard

Rozenn Menard

Valérie Descamps

Serge Kauffmann

Olivier Klarszinsky

Patrick Saindrenan

The invention concerns endofucanases suitable for preparing fuco-oligosaccharides by enzymatic hydrolysis of fucanes. It also concerns a bacterium producing endofucanases and the preparation of said enzyme from the bacterium. It further concerns endofucanase genes and it finally concerns the use said fuco-oligosaccharides for plant protection.

Endofucanases and method using same for preparing fuco-oligosaccharides from fucanes, bacterium producing endofucanases and uses of fuco-oligosaccharides for plant protection

The invention relates to a method for the stimulation of the reactions of natural defence of agronomically useful and of decorative plants, characterized by the fact that there is applied on the plants to be treated an aqueous composition comprising an efficient concentration in sulfate of &#x3b2; 1-3 glucan and more particularly a concentration of at least 1 mg/l, preferably of at least 5 mg/l, and still more preferably of at least 10 mg/l in laminarin sulfate, whose degree of sulfatation is higher than or equal to 1.9, preferably from 2 to 2.5, the said composition being applied to the culture or crop to be treated in an amount sufficient to provide per hectare an efficient amount of sulfate of &#x3b2; 1-3 glucan, and in the case of laminarin sulfate in an amount sufficient to provide from 0.4 to 4 g of laminarin sulfate per hectare.

Agent for stimulation of the natural defences of plants and methods for using it

Phosphorus acid derivatives and the like are used as an amplifier (potentiator) of plant defense responses induced by other materials (elicitors).

Use of antifungal and/or antibacterial and/or antiviral compounds

The present invention provides a method to potentiate and stimulate natural defensive reactions of plants to a pathogenic agent. The method comprises application to plants of a composition comprising an effective amount of one or more oligo &bgr; 1-3 glucans composed of 3 to 250 monosaccharide units and a vehicle, wherein the effective amount of oligo &bgr; 1-3 glucans in the composition does not directly stimulate natural defensive reactions of plants when the pathogenic agent is absent.

Method for stimulating natural control system of plants

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Souffelweyersheim, France

Bernard Fritig