シロイヌナズナとゼニゴケにおける概日時計と光周性(<特集>植物の概日時計と光周性花成応答)

概要

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Plants regulate timing of phase transition in response to day length. Over the past 80 years a considerable number of studies have been done on photoreceptors and circadian clock to understand photoperiodism. Today, the factors mediating the physiological response have been examined extensively. However we could not achieve a comprehensive understanding yet, due to their complexity of signaling network. This review provides a brief overview of the current state of photoreceptors, circadian clock and photoperiodic flowering in Arabidopsis thaliana and addresses to the future issues of these research fields. Also we introduce a novel approach to understand a framework of entire signaling pathway from light input to physiological output by using species with low genetic redundancy. In particular, recent studies in the liverwort Marchantia polymorpha, one of emerging model plants in bryophytes, have revealed that it has the most simplified version with all required components for A. thaliana circadian clock and photoperiodic growth-phase regulation. Together with the phylogenetic position as basal land plants, studies with M. polymorpha provide us insights into the evolution of underlying mechanism regulating photoperiodic growth-phase transition.
2014-05-30