An isolated plant gene encoding a .beta.-amyrin synthase

C - Chemistry – Metallurgy – 12 – N

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C12N 15/29 (2006.01) A01H 5/00 (2006.01) C07H 21/00 (2006.01) C12N 9/90 (2006.01) C12N 15/52 (2006.01) C12N 15/61 (2006.01) C12N 15/82 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2392435

Disclosed are isolated .beta.-amyrin synthase-encoding cDNA and gDNA nucleic acids. The genes are involved in saponin synthesis. One preferred embodiment is the nucleotide sequence which encodes the polypeptide of Annex II. Also provided are variant sequences (e.g. alleles, derivatives) and complementary sequences, plus vectors, host cells, plants, polypeptides, and associated processes of production and methods of use e.g. for influencing or affecting triterpene synsthesis, and hence the resistance to a fungal pathogen, taste, palatability or nutritional value of the plant. Also provided is the .beta.- amyrin synthase promoter sequence and variants and uses thereof.

L'invention concerne des acides nucléiques isolés d'ADN complémentaire et d'ADN génomique codant pour la synthase de la beta -amyrine. Les gènes interviennent dans la synthèse de la saponine. Un mode de réalisation optimal consiste en une séquence nucléotidique codant pour le polypeptide décrit dans l'Annexe II. L'invention concerne également des séquences variantes (par exemple, allèles, dérivés) et des séquences complémentaires, ainsi que des vecteurs, des cellules hôtes, des plantes, des polypeptides et des procédés de production et d'utilisation associés, par exemple, afin d'influencer ou de modifier la synthèse de la triterpène, et, de ce fait, la résistance à un pathogène fongique, le goût, la palatabilité ou la valeur nutritionnelle du végétal. L'invention concerne également le promoteur de la synthase de la g(b)-amyrine et des variants ainsi que leur utilisation.

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