Methods for producing apomictic plants

A - Human Necessities – 01 – H

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A01H 1/00 (2006.01) A01G 7/00 (2006.01) A01H 1/02 (2006.01) A01H 1/04 (2006.01) A01H 1/08 (2006.01)

Patent

CA 2280145

Methods are provided for producing apomictic plants from sexual plants divergent with respect to responses to different photoperiods and schedules of megaspore and gametophyte development. A preferred system is to identify divergent lines from within a species or closely related group of species, accentuate the divergence by breeding where necessary, and produce artificial amphiploids that contain genomes from the apposing divergent lines. Apomixis results from the asynchronous expression of female developmental programs induced by combining the reproductively divergent lines. The procedures for manipulating the expression of apomixis described herein permit the development of true-breeding hybrids of various cultivated crops.

L'invention concerne des procédés servant à produire des plantes apomictiques à partir de plantes sexuées divergentes quant à leurs réactions à des photopériodes et des calendriers différents de développement de mégaspores et de gamétophytes. Un système préféré comporte les étapes consistant à identifier des lignes divergentes au sein d'une espèce ou d'un groupe d'espèces étroitement lié; accentuer la divergence par amélioration génétique si nécessaire; et produire des amphiloïdes artificiels qui contiennent des génomes provenant de lignes divergentes apposées. Une apomixie résulte de l'expression asynchrone de programmes de croissance femelle provoqués par la combinaison de lignes divergentes du point de vue de la reproduction. Les techniques décrites servant à la manipulation de l'expression de l'apomixie permettent de développer des hybrides à reproduction véritable de diverses plantes cultivées.

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