Analysis and modeling of the integrative response of Medicago truncatula to nitrogen constraints

作者：Salon Christophe^*; Lepetit Marc; Gamas Pascal; Jeudy Christian; Moreau Sandra; Moreau Delphine; Voisin Anne Sophie; Duc Gerard; Bourion Virginie; Munier Jolain Nathalie

来源：Comptes Rendus Biologies, 2009, 332(11): 1022-1033.

DOI：10.1016/j.crvi.2009.09.009

• Medicago truncatula
• Assimilation
• Fixation
• Nitrogen
• Root and nodule development
• Systemic regulation
• Modeling

An integrative biology approach was conducted in Medicago truncatula for: (i) unraveling the coordinated regulation of NO(3)(-), NH(4)(+) and N(2) acquisition by legumes to fulfill the plant N demand; and (ii) modeling the emerging properties occurring at the whole plant level. Upon localized addition of a high level of mineral N, the three N acquisition pathways displayed similar systemic feedback repression to adjust N acquisition capacities to the plant N status. Genes associated to these responses were in contrast rather specific to the N source. Following an N deficit, NO(3)(-) fed plants maintained efficiently their N status through rapid functional and developmental up regulations while N(2) fed plants responded by long term plasticity of nodule development. Regulatory genes associated with various symbiotic stages were further identified. An ecophysiological model simulating relations between leaf area and roots N retrieval was developed and now furnishes an analysis grid to characterize a spontaneous or induced genetic variability for plant N nutrition. To cite this article: C. Salon et al., C. R. Biologies 332 (2009).

• 出版日期2009-11