Centre National De La Recherche Scientifique

Institut National De La Recherche Agronomique

Institut National De La Recherche Agronomique (inra)

Bayer Sas

Universite Paul Sabatier

Bayer Cropscience S.a.

Institut National De Recherche Pour L'agriculture, L'alimentation Et Environnement

Université Paul Sabatier (toulouse Iii)

Institut National De Recherche Pour L'agriculture, L'alimentation Et L'environnement

Fabienne Chantal Maillet

Jean Louis Denarie

Boris Vauzeilles

Jean-Marie Beau

Nathalie Grenouillat

Guillaume Becard

Olivier Andre

Laurence Cromer

Delphine Giraudet

Alexandra Haouy

Alfred Grenier

Monique Gueunier

Jean-Claude Adrien Prome

Philippe Roche

Patrice Lerouge

Véréna Poinsot

William John Broughton

Franck Jean Talmont

Alfred Greiner

Neil Philip Price

Danielle Jean Prome

Biserka Relic

Georges Truchet

Catherine Faucher

The invention relates to lipochitooligosaccharides obtainable from arbuscular mycorrhizal fungi, and which are useful for stimulating arbuscular mycorrhizal symbiosis, and lateral root formation.

Lipochito-oligosaccharides stimulating arbuscular mycorrhizal symbiosis

The present invention relates to synthetic compounds that are active on plants, especially as legume nodulation factors, and also as plant growth stimulators, and to methods for preparing such compounds, which are of formula (I). 

Synthetic compounds useful as nodulation agents of leguminous plants and preparation processes thereof

The present invention relates to synthetic compounds that are active on plants, especially as legume nodulation factors, and also as plant growth stimulators, and to methods for preparing such compounds, which are of formula (I): 

Broad host spectrum rhizobiaceae nodulation signals

An essentially pure substance has a structure of a Nod factor or one of its analogues. The Nod factor is characterized by the fact that its biosynthesis is controlled by at least one nodulation gene (nodA,B,C) common to the Rhizobiaceae, in particular to the genera Rhizobium, Bradyrhizobium, Sinorhizobium and Azorhizobium. This substance consists of a lipo-oligosaccharide which is not a derivative of the exopolysaccharides and which has the general formula (I). In formula (I), the Nod factor of which it has the structure is a plant-specific symbiotic signal and is capable of enhancing the capacity of the bacteria of infect the host plant with which it is associated and/or of accelerating the formation of nodules on the host plant with which it is associated and/or of inducing the transcription of symbiotic genes of the leguminoseae. Applications to the treatment of plants and as an active therapeutic agent in humans and animals. G stands for a hexosamine variously substituted, for example by an acetyl group on the nitrogen, a sulphate group, an acetyl group and/or an ether group on oxygen R.sub.1, R.sub.2, R.sub.3, R.sub.5, R.sub.6, R.sub.7, which may be identical or different, stand for H, CH.sub.3 CO--, C.sub.x H.sub.y CO-- where X is a whole number between 0 and 17 and Y is a whole number between 1 and 35, or any other acyl group, for example a carbamyl groups, R.sub.4 stands for a saturated or mono-, di or tri-unsaturated aliphatic chain containing at least 12 carbon atoms and n is a whole number between 1 and 4.

Substance with lipo-oligosaccharide structure capable of acting as

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Pompertuzat, France

Fabienne Chantal Maillet