シロイヌナズナには存在しないイネに独特な光周性花芽誘導分子機構(<特集>花成誘導)

概要

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In the photoperiodic control of flowering in Arabidopsis thaliana, a long-day plant, the key transcription factor CONSTANS (CO) gene, which is a main activator of the florigen FT gene, is mainly regulated by the circadian rhythms and modulated by light-signaling transcriptionally and post-transcriptionally. In rice, a shrot-day plants, it has been revealed that Heading date 1 (Hd1) gene (a CO otholog) controls Heading-date 3a (Hd3a) gene (a FT ortholog). Therefore, it is now thought that the difference between long-day and short-day plants can be explained by rather simple modification of the evolutionally conserved CO-FT (Hd1-Hd3a) transcriptional regulation system. Recent cloning of novel flowering-time genes in rice, however, strongly suggests that there may be unique systems to control flowering in rice. Here, I would summarize the new knowledge on novel flowering-time genes in rice to discuss the difference of molecular machinery between short-day and long-day plants.
2009-12-18