Light signals and flowering.

摘要: Physiological studies over a long period have shown that light acts to regulate flowering through the three main variables of quality, quantity, and duration. Intensive molecular genetic genomic with model plant Arabidopsis given considerable insight into mechanisms involved, particularly regard quality photoperiod. For photoperiodism light, acting phytochromes cryptochromes, photomorphogenetic photoreceptors, entrain interact circadian rhythm CONSTANS (CO) expression leading transcription mobile floral integrator, FLOWERING LOCUS T (FT). The action cryptochromes in is augmented by ZEITLUPE (ZTL) FLAVIN-BINDING, KELCH REPEAT, F-BOX (FKF1) as accessory photoreceptors on entrainment interaction, respectively. Light independently system Phytochromes B, D, E FT. quantity effects, other hand, are still incompletely understood but likely be linked either directly or indirectly patterns assimilate partitioning resource utilization within plant.