Polynucleotides, dna constructs and methods for the...

A - Human Necessities – 01 – H

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A01H 1/00 (2006.01)

Patent

CA 2577371

Polynucleotides, DNA constructs and methods are disclosed for the modification of lignin content in plant tissues. Plants are transformed with a DNA molecule encoding an active S-adenosylmethionine decarboxylase (SAMdc) enzyme. The over- expression of a SAMdc gene in the plant's vascular system leads to decreased S- adenosylmethionine availability and consequently to an overall decrease in lignin content. Plant transformants harboring a SAMdc coding nucleic acid molecule are expected to demonstrate decreased levels of lignin, a trait that is thought to render woody trees more amenable to cellulose extraction and improve the pulping and papermaking processes.

L'invention concerne des polynucléotides, des structures d'ADN et des procédés destinés à la modification de la teneur en lignine des tissus végétaux. Les plantes sont transformées avec une molécule <i>DNA </i> codant une enzyme de S-adénosylméthionine décarboxylase active (SAMdc). La surexpression du gène SAMdc dans le système vasculaire de la plante mène à une disponibilité réduite de S-adénosylméthionine et, par conséquent, à une réduction générale de la teneur en lignine. Les transformants des végétaux comprenant une molécule d'acide nucléique codant SAMdc sont supposés manifester des teneurs en lignine réduites, trait caractéristique dont on pense qu'il rend les arbres ligneux mieux adaptés à l'extraction de la cellulose et permet d'améliorer les processus de production de pulpe et de fabrication de papier.

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