A method of selectively producing male or female sterile plants

Details A method of selectively producing male or female sterile plants A method of selectively producing male or female sterile plants

C - Chemistry, Metallurgy

12

N

C12N 15/82 (2006.01) C07F 9/38 (2006.01) C12N 9/06 (2006.01) C12N 9/18 (2006.01) C12P 13/04 (2006.01) C12P 17/12 (2006.01) C12P 41/00 (2006.01)

Patent

CA 2475485

A method of producing male or female sterile plants comprising the steps of transforming plant material with a polynucleotide which encodes at least one enzyme which reacts with a non-phytotoxic substance to produce a phytotoxic one, and regenerating the thus transformed material into a plant, wherein the said non-phytotoxic substance is applied to the plant up to the time of male or female gamete formation and/ or maturation, so that the non- phytotoxic substance provides for the production of a phytotoxic one which selectively prevents the formation of or otherwise renders the said gametes non- functional, wherein the enzyme is expressed preferentially in either male or female reproductive structures, characterised in that (i) the non-phytotoxic substance is selected from the group consisting of ester derivatives of non- phosphonate herbicides which herbicides are directly phytotoxic to non-green tissue, D-alpha amino acids, peptide derivatives of non-protein D-alpha amino acids, S-enantiomers of aryloxyphenoxypropionates and S-enantiomers of ester derivatives of aryloxyphenoxypropionates and (ii) the enzyme is selected from the group consisting of carboxylesterases , D-amino acid oxidases, D-amino acid dehydrogenases, D-amino acid racemases, 2-arylpropionyl-CoA epimerases, alpha-methylacyl-CoA racemases, thioesterases and acyl-CoA synthetases.

L'invention concerne un procédé de production de plantes stériles mâles ou femelles. Ce procédé comprend les étapes consistant à transformer le matériau de la plante avec un polynucléotide qui code au moins une enzyme qui réagit avec une substance non phytotoxique pour produire une substance phytoxique. Ce procédé consiste ensuite à regénérer le matériau ainsi transformé en une plante, ladite substance non phytotoxique étant ainsi appliquée à la plante jusqu'au moment de la formation et/ou maturation de gamètes mâles ou femelles, de telle sorte que la substance non phyototoxique assure la production d'une substance phytotoxique, qui empêche de manière sélective la formation ou rend lesdites gamètes non fonctionnelles. L'enzyme est ainsi exprimée de manière préférentielle dans des structures de reproduction mâles ou femmes. Ce système se caractérise en ce que (i) la substance non phytoxique est sélectionnée dans le groupe se composant de dérivés d'esters d'herbicides non phosphonates, lesquels herbicides sont directement phytotoxiques pour des tissus non verts, des acides D-alpha amino, des dérivés peptidiques d'acides D-alpha amino non protéines, des S-énantiomères d'aryloxyphénoxypropionates et S-énantiomères de dérivés esters d'aryloxyphénoxypropionates et (ii) l'enzyme est sélectionnée dans le groupe se compsant de carboxylestérases, D-amino acide oxydases, D-amino acide déhydrogénases, D-amino acide racemases, 2-arylpropionyl-CoA épimérases, alpha-méthylacyl-CoA racemases, thioestérases et acyl-CoA synthétases.

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