Photoperiodic Control of Flowering in the Short-Day Plant Oryza sativa
This chapter summarizes the progress made in understanding photoperiodic flowering in rice. Over the last decade, major questions regarding the photoperiodic control of flowering in plants have been addressed. First, the external coincidence model was supported at the molecular level in both long-day and short-day plants. Next, studies identified the major genetic components that differ between long-day and short-day plants. Their opposite responses to photoperiods were attributed to the distinct transcriptional mechanisms of florigen genes, such as FT and Hd3a. Finally, the molecular nature of these florigens was revealed. In addition to these achievements, biochemical studies were undertaken to investigate the molecular mechanisms underlying the interaction between light signals and circadian clocks, in order to explain how Arabidopsis thaliana can recognize day length and consequently express FT.
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