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“Chromatin Re-organization during Shade Avoidance”

Objective

Plants are sessile photosynthetic organisms, which adapt their growth and development according to their light environment. The reduction in red/far-red ratio (low R/FR), caused by absorption of red light and reflection of far-red radiation by canopy leaves, signals the proximity of neighboring plants and triggers the shade avoidance syndrome (SAS). The SAS consists in large changes in plant body form, in particular rapid elongation of selected organs providing enhanced access to sunlight. Shade-induced elongation is triggered by a rapid and transient burst in the production of the phyto-hormone auxin (IAA). However, elongation growth persists way beyond the initial increase in IAA levels and it is currently not understood how this initial signal leads to long-term growth. This project aims to identify epigenetic reprogramming events caused by reduction in R/FR and the pulse of IAA production, to allow a rapid and persistent growth response in Arabidopsis thaliana. The chromatin state of shade-grown seedlings will be analyzed by combining two novel approaches: INTACT nuclei purification and ATAC-sequencing providing information about chromatin accessibility. This data will be integrated with genome-wide expression and transcription factor binding sites enabling us to relate transcription factor binding, chromatin state and gene expression. The relevance of shade-induced changes in chromatin modification will be tested functionally by mutational analyses. This project will provide important information about the regulation of gene expression by changes in the environment and how these are mediated by hormonal cues and light-regulated chromatin organization. More broadly, understanding the response to shade has an agricultural relevance. Crops grown at high density display the SAS leading to the reallocation of resources towards fast growing stems and causing a reduction in biomass of storage organs that are important for agricultural yield.

Fields of science (EuroSciVoc)

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Programme(s)

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Topic(s)

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Funding Scheme

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MSCA-IF-EF-ST - Standard EF

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Call for proposal

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(opens in new window) H2020-MSCA-IF-2017

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Coordinator

UNIVERSITE DE LAUSANNE
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 175 419,60
Address
QUARTIER UNIL CENTRE - BATIMENT UNICENTRE
1015 LAUSANNE
Switzerland

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Region
Schweiz/Suisse/Svizzera Région lémanique Vaud
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 175 419,60
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