Polypeptide extracted from plants of the genus lupinus or produced in recombinant form, nucleotide sequence encoding it and its use in animal nutrition, as a plant growth promoter and in the fight against pathogenic fungi

A method of promoting plant growth or fertilization comprising applying to a plant in need thereof an effective amount of a polypeptide, the polypeptide comprising the amino acid sequence of SEQ ID NO:

• 1 or a sequence having at least 85% sequence identity thereto,
• wherein the polypeptide does not comprise a sequence of 531 consecutive amino acid residues of β conglutin from Lupinus albus, and
• wherein the polypeptide exhibits at least one of the group consisting of:
• anti-fungal activity, anti-Oomyces activity, and insecticide activity.

A DNA fragment comprising a nucleotide sequence encoding a polypeptide, the polypeptide comprising the amino acid sequence of SEQ ID NO:

• 1 or a sequence having at least 85% sequence identity thereto,
• wherein the polypeptide does not comprise a sequence of 531 consecutive amino acid residues of β conglutin from Lupinus albus, and
• wherein the polypeptide exhibits at least one of the group consisting of:
• anti-fungal activity, anti-Oomyces activity, insecticide activity, and human or animal nutritional properties.