SEVERAC , Dany

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....

In legumes interacting with rhizobia, the formation of symbiotic organs involved in the acquisition of atmospheric nitrogen gas (N2) is dependent on the plant nitrogen (N) demand. We used Medicago truncatula plants cultivated in split-root systems to discriminate between responses to local and systemic N signaling. We evidenced a strong control...