ViPS Invited Seminar September 2021

Christophe Maurel, CNRS & INRAE, Montpellier, France

Date: 15th September 2021

Time: 13:00

Title: Environmental and hormonal control of plant hydraulics: molecular and genetic dissection

Location: Remotely via Zoom

Host: Maija Sierla

Abstract: Plant water transport is a key component of plant performance and adaptation to adverse environments. Plasma membrane aquaporins mediate multiple controls of plant tissue hydraulics. New insights into the mechanisms at work in their regulation in roots, leaf veins and stomata will be presented, with emphasis on the major role of phosphorylation. In this context, the PIP2;1 aquaporin, which transports both water and hydrogen peroxide, was shown to play a dual hydraulic and signaling role during stomatal movement. To obtain a better view of root water uptake and its regulation, we also investigated the genetic bases of root hydraulics in Arabidopsis and maize, using quantitative genetics approaches, including linkage mapping and genome-wide association mapping. Several Arabidopsis genes controlling root hydraulics were identified and will be discussed. Finally, we developed a combination of experimental and mathematical modelling approaches which allow a concomitant determination of root radial and axial conductivities and a comprehensive view of root hydraulic architecture.

Christophe Maurel has a long-standing interest in plant water transport. His group uses molecular and physiological approaches to investigate the modes of water transport regulation at the level of cloned aquaporins, purified membranes, living cells or organs like excised roots. In addition, quantitative genetics, root phenotyping and mathematical modeling are combined to address the dynamics of growth and hydraulics in roots, showing how these adapt to environmental constraints.

Read more about the Maurel lab

Related publications:

Maurel C, Nacry P (2020) Root architecture and hydraulics converge for acclimation to changing water availability. Nat Plants 6 (7):744-749.

Prado K, Cotelle V, Li G, Bellati J, Tang N, Tournaire-Roux C, Martiniere A, Santoni V, Maurel C (2019) Oscillating Aquaporin Phosphorylation and 14-3-3 Proteins Mediate the Circadian Regulation of Leaf Hydraulics. Plant Cell 31 (2):417-429.

Rodrigues O, Reshetnyak G, Grondin A, Saijo Y, Leonhardt N, Maurel C, Verdoucq L (2017) Aquaporins facilitate hydrogen peroxide entry into guard cells to mediate ABA- and pathogen-triggered stomatal closure. Proc Natl Acad Sci USA 114:9200-9205.

Shahzad Z, Canut M, Tournaire-Roux C, Martinière A, Boursiac Y, Loudet O, Maurel C (2016) A potassium-dependent oxygen sensing pathway regulates plant root hydraulics. Cell 167:87-98

Tang N, Shahzad Z, Lonjon F, Loudet O, Vailleau F, Maurel C (2018) Natural variation at XND1 impacts root hydraulics and trade-off for stress responses in Arabidopsis. Nat Commun 9 (1):3884.