Monocotyledonous plant transformation

A - Human Necessities – 01 – H

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Details

A01H 1/00 (2006.01) A01H 4/00 (2006.01) A01H 5/00 (2006.01) C12N 15/82 (2006.01)

Patent

CA 2454383

A method of producing a transgenic monocotyledonous plant includes culturing a thin section explant from a monocotyledonous plant, such as sugarcane, wheat or sorghum, in the presence of an auxin and, optionally, a cytokinin, prior to transformation. It is optimal for the thin section to be oriented during this pre-transformation culture period of 1-6 days so that a basal surface is substantially not in contact with the culture medium. The cultured explant is then transformed followed by a rest period of 4-15 days in a culture medium without selection agent but comprising an auxin and, optionally, a cytokinin. After this rest period, transgenic plants are selectively propagated from the transformed plant tissue in the presence of a selection agent such as paromomycin sulphate or geneticin. This system provides rapid, efficient generation of transgenic monocotyledonous plants from transformed, non-callus tissue and thereby reduces the likelihood of somaclonal variation among transgenic progeny.

La présente invention concerne un procédé de production d'une plante transgénique à monocotylédones comportant la culture d'un explant de section mince à partir d'une plante à monocotylédones, le blé ou le sorgho, en présence d'une auxine et, éventuellement, une cytokinine, préalablement à la transformation. De manière optimale on oriente la section mince durant la période de culture de pré-transformation de 1 à 6 jours de sorte qu'une surface de base soit sensiblement sans contact avec le milieu de culture. On transforme alors l'explant de culture suivi d'une période de repos de 4 à 15 jours dans le milieu de culture sans agent de sélection mais comprenant une auxine et, éventuellement, une cytokinine. Après cette période de repos, on propage les plantes transgéniques à partir du tissu de la plante transformée en présence d'un agent de sélection tel la paromomycine sulfate ou la généticine. Le système prévoit une génération rapide et efficace des plantes transgéniques à monocotylédones à partir de tissu sans cals et réduit ainsi la possibilité de variation somaclonale parmi la descendance transgénique.

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