Transgenic trees exhibiting increased growth, biomass...

Details Transgenic trees exhibiting increased growth, biomass... Transgenic trees exhibiting increased growth, biomass...

C - Chemistry, Metallurgy

12

N

C12N 5/10 (2006.01) A01H 5/00 (2006.01) C12N 5/04 (2006.01) C12N 15/53 (2006.01) C12N 15/82 (2006.01)

Patent

CA 2400986

Important aims in nearly all tree-breeding programs around the world are to produce plants with increased growth rates and stem volumes, and shorter rotation times. Such trees would yield more biomass per area unit. Here the present inventors have shown that when over-expressing a key regulatory gene in the biosynthesis of the plant hormone gibberellin (GA) in hybrid aspen (Populus tremula x P. tremuloides), improvements in valuable traits such as growth rate and biomass are obtained. In addition, these trees also have longer xylem fibers than unmodified wild type plants. Long fibres are very desirable in the production of strong paper, but it has not (as yet) proved possible to influence this trait by traditional breeding techniques. A further advantage of the present invention is that it may reduce or eliminate the use of growth influencing chemicals in forestry.

L'un des buts recherchés, dans presque tous les programmes mondiaux d'amélioration de la culture des arbres, est de produire des végétaux possédant des vitesses de croissance et des volumes de tige accrus, et des périodicités de coupe plus courtes, de tels arbres devant produire plus de biomasse par unité de surface. Les inventeurs ont découvert que l'on obtenait des améliorations dans des domaines importants, tels que la vitesse de croissance et la biomasse, en surexprimant un gène clé régulateur, dans la biosynthèse de l'hormone végétale gibbérelline (GA) du peuplier hybride (<i>Populus tremula x P. tremuloides</i>). En outre, ces arbres possèdent également des fibres de xylème plus longues que les végétaux de type sauvage, non modifiés. Par ailleurs, des fibres longues sont requises dans la production de papier résistant, mais il n'a pas (encore) été possible d'agir sur cette caractéristique à l'aide de techniques de culture traditionnelles. Un autre avantage de l'invention réside en ce qu'il est possible de réduire ou éliminer l'utilisation de produits chimiques destinés à favoriser la croissance d'arbres forestiers.

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