Multi-faceted and integrated approaches to unravel water flows and water status in plant roots, under stationary and transient conditions - Institut des sciences des plantes de Montpellier
Hdr Année : 2024

Multi-faceted and integrated approaches to unravel water flows and water status in plant roots, under stationary and transient conditions

Résumé

Research in plant biology, even at the most fundamental level, needs to address today important issues for the future. These include meeting the growing nutritional needs of the world's population in a context of limited resources, or evaluating wild plants adaptation to climate change. This is particularly true for water, the quality and quantity of which will increasingly be challenged. Understanding how water circulates within plants and how plant water status is shaped by the environment are two of the cornerstones of addressing this issue. To study water flows under stationary conditions, I have developed projects in functional and integrative biology, in which we have been able to test how “usual suspects” are involved in the water transport capacity of a root, notably apoplastic diffusion barriers such as the Casparian strips and suberin. This work has been enriched by modeling approaches, at the scales of tissues and organ, which have enabled us to gain a better understanding of how root structures (architecture, vessels, anatomy) influence water transport and integrate into a root hydraulic architecture. My projects will evolve towards a more dynamic vision of water flows and plant water status. Transient conditions appear in contexts such as water deficit treatment, and I am interested in the variations in the physico-chemical environment around the root (components of the water potential), and how they are transduced into a biological response. recent work shows that plant cells respond transcriptionally to two distinct parameters during water stress: variations in turgor and osmotic pressure. Further study of two candidate genes quantitatively regulated by these parameters reveals the involvement of complex mechanisms, including mRNA degradation pathways, in these responses. We have been able to develop a sensitive and rapid transcriptional line that is able to report variations of the root's hydraulic environment, which we call a “hydro-reporter”. Future studies on the regulation of these genes will enable us to gain a better understanding of the early phases of water stress perception in plants. The originality of my work lies in a strong coupling between experimentation and modeling, and our relatively unique ability to measure fine hydraulic parameters of plant cells and organs.
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Dates et versions

tel-04780179 , version 1 (13-11-2024)

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  • HAL Id : tel-04780179 , version 1

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Yann Boursiac. Multi-faceted and integrated approaches to unravel water flows and water status in plant roots, under stationary and transient conditions. Life Sciences [q-bio]. Université Montpellier, 2024. ⟨tel-04780179⟩
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