AUTHOR=Martin Marie-Laure , Pervent Marjorie , Lambert Ilana , Colella Stefano , Tancelin Mathilde , Severac Dany , Clément Gilles , Tillard Pascal , Frugier Florian , Lepetit Marc 

TITLE=Localized osmotic stress activates systemic responses to N limitation in Medicago truncatula–Sinorhizobium symbiotic plants

JOURNAL=Frontiers in Plant Science

VOLUME=Volume 14 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1288070

DOI=10.3389/fpls.2023.1288070

ISSN=1664-462X

ABSTRACT=The topic of this paper is the physiological adaptation of legume-rhizobium symbiotic plants to fluctuating and heterogeneous environmental constraints. How inter-organ signaling may contribute to whole plant adaptation to a localized stress is the major biological question addressed by this study using molecular and physiological approaches. The response of Medicago truncatula/Sinorhizobium medicae symbiotic plants supplied exclusively by symbiotic nitrogen fixation to a localized water constraint was analyzed using split-root systems. Results argue for a role of systemic N signaling in the root compensation of local variations impairing locally the symbiotic activity.