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DELLA-Mediated Control of Flowering in Arabidopsis Thaliana

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Costa Galvão,  V       
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Horrer,  D
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Küttner,  F
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Schmid,  M       
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Citation

Costa Galvão, V., Horrer, D., Küttner, F., & Schmid, M. (2012). DELLA-Mediated Control of Flowering in Arabidopsis Thaliana. Poster presented at 23rd International Conference on Arabidopsis Research (ICAR 2012), Wien, Austria.


Cite as: https://hdl.handle.net/21.11116/0000-000C-ACB8-3
Abstract
The transition from vegetative to reproductive development is a critical event in the plant life cycle. To ensure the correct timing of flowering, plants perceive and integrate environmental and endogenous signals such as photoperiod, temperature and hormonal status. The hormone gibberellic acid (GA) has long been known to contribute to the regulation of flowering in many plant species. However, where in the plant and how GA signaling is integrated into the flowering time pathways is poorly understood. To address this question we have performed a systematic analysis of the role of the five Arabidopsis thaliana DELLA proteins, which have recently emerged as important components of the GA signaling cascade in the regulation of flowering. We demonstrate that misexpression of GA-insensitive DELLA either in vasculature or shoot meristem using tissue-specific promoter delays flowering under long day condition. Interestingly, we demonstrate that GA regulates the expression of flowering time integrators such as FLOWERING LOCUS T (FT) and TWIN SYSTER OF FT (TSF) independently of CONSTANS (CO) and GIGANTEA (GI) in leaves. In contrast, under non-inductive short days GA-signaling contributes to the induction of flowering specifically at the shoot meristem. Expression analysis revealed that DELLA proteins control the SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) expression under both long and short day conditions independently of miR-156.