Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)
Jeudi 11 septembre 2014
Amphi 206 (Cœur d’école) à 14h
NRAMP2, a new member of the manganese network in Arabidopsis
BPMP, Equipe Transport et Signalisation Fer
Manganese (Mn) is an essential trace element in most organisms. In plants, Mn is required for the oxygen-evolving photosynthetic machinery, catalyzing the water-splitting reaction in PSII and as a cofactor of many enzymes Mn deficiency is a serious, widespread plant nutritional disorder in many arable soils that causes substantial yield losses. Little is known regarding the long distance and cellular transport in plants as well as the mechanisms controlling cellular Mn homeostasis in plants. Actually, there are several transporters, including members of NRAMP, P-type ATPase, ZIP and CAX families, which contribute to the tolerance to Mn excess or deficiency. We have additionally identified NRAMP2 as a crucial component of the Mn homeostasis machinery. Its role in photosynthesis activity will be discussed. Moreover, we will present a wide phenotypic analysis of the Mn transporter mutants, focusing in seed nutrient content, photosynthetic activity and oxidative stress.
Contact : Santiago Alejandro-Martinez