Control of plant flowering time by regulation of phytochrome...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/82 (2006.01) A01H 1/00 (2006.01) A01H 5/00 (2006.01) C12N 5/04 (2006.01) C12N 5/10 (2006.01) C12N 15/29 (2006.01)

Patent

CA 2459267

Rice phyC mutants were isolated using a mutant panel isolation method. When the mutants were grown under long-day photoperiodic conditions, it was found that they flowered (exposed their panicles (heads)) about one week earlier than the control rice. The results indicate that suppression of PHYC gene expression can promote plant flowering under long-day conditions. Utilization of the PHYC gene for promoting plant flowering will contribute substantially to breed improvement, for example, by facilitating the creation of useful agricultural crops and decorative plants that have a new characteristic adaptable for other cultivation areas and times. The rice phyC mutants described herein, which promote flowering under long-day conditions, will be highly prized as a new early-harvest rice cultivar.

On a découvert qu'un mutant du gène de riz phyC, qui est une plante isolée, au moyen d'un procédé d'isolement d'un mutant par l'utilisation d'un groupe de mutants possède un temps de floraison (de formation des têtes) antérieur d'environ une semaine à celui d'un groupe de contrôle, les végétaux étant cultivés dans des conditions de journée longue. Ce résultat indique qu'on peut favoriser la floraison des végétaux dans des conditions de journée longue par la régulation de l'expression du gène phyC. L'accélération de la floraison des végétaux au moyen du gène phyC peut contribuer à une large échelle à la sélection de cultures utiles ou de plantes d'ornement possédant de nouvelles caractéristiques, adaptées à certaines zones ou périodes de culture, etc. De plus, on s'attend à ce qu'un mutant du gène phyC du riz dont on favorise la floraison dans des conditions de journée longue constitue une nouvelle variété de riz, récoltée plus tôt.

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