Séminaire IBIP

Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)

Jeudi 23 janvier 2025 à 14h00 –Amphi 208

Matthieu Platre

(IPSiM-Equipe SIRENE)

Decoding the Limits of the Root System Plasticity under Climate Change Conditions

The root system is a critical organ to ensure the anchoring, water and nutrients uptake, and photo-assimilates transport, necessary for plant survival. To maintain these functions when exposed to environmental cues the root system altered its 3-dimensional organization in space, defined as the root system architecture (RSA)¹. Depending on the environmental changes, one single genotype displays a variety of RSA to adapt accordingly, highlighting its plasticity. Therefore, the RSA plasticity is a key determinant driving plant survival and adaptation. In the context of climate change, the understanding of RSA plasticity is therefore crucial to uncover plant resilience. The architectural plasticity can be assessed by changes of morphological (e.g. length), geometrical (e.g. depth), dynamical (e.g. growth rate), and topological descriptors. During the last half century, tremendous efforts were made to study those first three aspects due to their relatively easy assessment. Nonetheless, the analysis of RSA topology which consists of studying the efficiency and functions of a transport network remained underexplored notably by the requirements of computational analysis integrating several traits. In this talk, I will reveal how the efficiency of two root system functions, growth and transport, limit the RSA plasticity finding a growth-transport tradeoff by a modeling-based approach. Then, I will address how the climate change conditions that impact the root system functions decreasing water and nutrients accessibilities and promoting photo assimilates production modify the growth-transport tradeoff. Finally, I will present the experimental approaches to identify the genetic and molecular bases of the growth-transport tradeoff that limits the RSA plasticity.

Contact : Sandra.cortijo@cnrs.fr