Root osmotic sensing from local perception to systemic responses

Abstract

Plants face a constantly changing environment, requiring fine tuning of their growth and development. Plants have therefore developed numerous mechanisms to cope with environmental stress conditions. One striking example is root response to water deficit. Upon drought (which causes osmotic stress to cells), plants can among other responses alter locally their root system architecture (hydropatterning) or orientate their root growth to optimize water uptake (hydrotropism). They can also modify their hydraulic properties, metabolism and development coordinately at the whole root and plant levels. Upstream of these developmental and physiological changes, plant roots must perceive and transduce signals for water availability. Here, we review current knowledge on plant osmotic perception and discuss how long distance signaling can play a role in signal integration, leading to the great phenotypic plasticity of roots and plant development.

Keywords

Drought / Water deficit perception / Local signaling / Long distance signaling / Local water deficit / Adaptive development

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Funding

Agence Nationale de la Recherche(ANR-19-CE20-0008-01); HORIZON EUROPE European Research Council(ERC-2017-ADG-788553)