title: Role of arbuscular mycorrhizal symbiosis in root mineral uptake under CaCO3 stress.
abstract: This study investigated the effects of increasing CaCO(3) concentrations (0, 5, 10, 20 mM) on arbuscular mycorrhizal (AM) symbiosis establishment as well as on chicory root growth and mineral nutrient uptake in a monoxenic system. Although CaCO(3) treatments significantly decreased root growth and altered the symbiosis-related development steps of the AM fungus Rhizophagus irregularis (germination, germination hypha elongation, root colonization rate, extraradical hyphal development, sporulation), the fungus was able to completely fulfill its life cycle. Even when root growth decreased more drastically in mycorrhizal roots than in non-mycorrhizal ones in the presence of high CaCO(3) levels, the AM symbiosis was found to be beneficial for root mineral uptake. Significant increases in P, N, Fe, Zn and Cu concentrations were recorded in the mycorrhizal roots. Whereas acid and alkaline phosphatase enzymatic activities remained constant in mycorrhizal roots, they were affected in non-mycorrhizal roots grown in the presence of CaCO(3) when compared with the control.
authors.affiliation: Unité Cultures Maraîchères et Florales (UCMF), Institut National Agronomique de Tunisie, 43 Ave Charles Nicolle, Mahrajène, 1082, Tunis, Tunisia.
authors.forename: Sonia
authors.initials: S
authors.lastname: Labidi
authors.forename: Fayçal
authors.initials: F
authors.lastname: Ben Jeddi
authors.forename: Benoit
authors.initials: B
authors.lastname: Tisserant
authors.forename: Djouher
authors.initials: D
authors.lastname: Debiane
authors.forename: Salah
authors.initials: S
authors.lastname: Rezgui
authors.forename: Anne
authors.initials: A
authors.lastname: Grandmougin-Ferjani
authors.forename: Anissa
authors.initials: A
authors.lastname: Lounès-Hadj Sahraoui
mesh_terms: D002119:Calcium Carbonate / Q000494:pharmacology*; D005658:Fungi / Q000187:drug effects / Q000254:growth & development; D008903:Minerals / Q000378:metabolism*; D038821:Mycorrhizae / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism / Q000382:microbiology; D013172:Spores, Fungal / Q000187:drug effects / Q000254:growth & development; D013312:Stress, Physiological; D013559:Symbiosis
chemical_list: D008903:Minerals; D002119:Calcium Carbonate