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

Jeudi 19 mai 2022 à 14h – Salle 108


Daniel Marino

Fac. Sciences and Technology, University of the Basque Country (UPV/EHU), Leioa (Spain)


Ammonium nutrition meets iron homeostasis


Plants take up nitrogen (N) from the soil mostly in the form of nitrate (NO3) and ammonium (NH4+). Regardless of the N source, N assimilation into biomolecules occurs from NH4+ incorporation into carbon skeletons, and thus the direct uptake of NH4+ bypasses the energy-consuming NO3-reduction process. Moreover, ammonium-based fertilization may represent an alternative to nitrate-based fertilization to reduce the negative environmental impact of nitrogen fertilization. However, when plants are grown with high concentration of NH4+ in the external medium, most species display stress symptoms. The cause leading to stress apparition is multi-factorial and includes, among others, pH alterations, oxidative stress and energetic trade-offs. In addition, the N source available is known to interact of other macro- and micronutrients. In our research group we aim at understanding the metabolic and genetic basis of ammonium tolerance and sensibility in model plants and crops. In particular, we have observed a strong interaction between iron homeostasis and ammonium nutrition. In this talk, these results will be presented, among others, showing the involvement of Arabidopsis thaliana MYB28 and MYB29 transcription factors in this nutritional cross-talk.




Contact : Florence Vignols

Contacts IBIP :

Sabine Zimmermann (sabine.zimmermann@cnrs.fr)
Alexandre Martiniere (alexandre.martiniere@cnrs.fr)

Aude Coupel-Ledru (aude.coupel-ledru@inrae.fr)

Chantal Baracco (chantal.baracco@inrae.fr)