Induction of flowering by seasonal changes in photoperiod - PubMed (original) (raw)

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Induction of flowering by seasonal changes in photoperiod

Iain Searle et al. EMBO J. 2004.

Abstract

In many plants, major developmental transitions such as the initiation of flowering are synchronized to the changing seasons. Day length provides one of the environmental cues used to achieve this. We describe the molecular mechanisms that measure day length and control flowering in Arabidopsis. Also, we compare these mechanisms with those that control flowering time in rice. This comparison suggests that components of the Arabidopsis regulatory network are conserved in other species, but that their regulation can be altered to generate different phenotypic responses.

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Figures

Figure 1

Figure 1

Molecular hierarchy that controls flowering of Arabidopsis in response to photoperiod. Arrows between genes represent promotive effects, whereas perpendicular lines represent repressive effects.

Figure 2

Figure 2

Expression patterns of the mRNAs of circadian-clock-controlled genes CO and FT under long and short days. Under short days (8 h light:16 h dark), CO mRNA expression peaks during the night (upper panel), CO protein does not accumulate and the downstream gene FT is not expressed. Under long-day conditions (16 h light:8 h dark), the peak of CO mRNA expression partly coincides with light (lower panel), the protein accumulates in the nucleus and the expression of FT mRNA is activated. FT promotes early flowering.

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