caa a22 4500 606219285 CHVBK 20210128101117.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11104-015-2552-z doi (NATIONALLICENCE)springer-10.1007/s11104-015-2552-z Plant tolerance of ammonium varies between co-existing Mediterranean species [Elektronische Daten] [Teresa Dias, Maria Martins-Loução, Lucy Sheppard, Cristina Cruz] Background: Previous studies showed that the two main Mediterranean plant functional groups, summer semi-deciduous and evergreen sclerophylls, differ in soil characteristics and nitrate (NO3 −) use strategies: even though summer semi-deciduous plants have higher NO3 − availability than evergreen sclerophylls, NO3 − reduction (i.e., nitrate reductase activity—NRA) is lower, and is not stimulated by substrate (NO3 − ) availability. Aims: Test if in Cistus albidus plants, a summer semi-deciduous species, ammonium (NH4 + ) can inhibit NRA, despite the availability of NO3 − , and whether Olea europaea plants, evergreen sclerophyll, are more tolerant of NH4 + than the former. Methods: One-year-old C. albidus and wild O. europaea potted plants were supplied with both NH4 + and NO3 − at increasing levels (0.1; 0.2; 0.4; 0.8 and 1.6% N). Tolerance of NH4 + was evaluated using integrative (mortality and biomass accumulation) and plant nitrogen metabolism parameters (in vitro NRA and concentrations of NO3 − and NH4 +) determined in roots and leaves. Results: C. albidus plants were consistently less NH4 + tolerant than O. europaea, displaying: higher mortality; growth and NRA inhibition and NH4 + accumulation above 0.2% NH4NO3-N in the soil. In contrast, O. europaea plants seemed to buffer the full range of tested NH4NO3 levels. Conclusions: C. albidus plants were less NH4 + tolerant than O. europaea. The ecological implications of this contrasting NH4 + tolerance are discussed. Springer International Publishing Switzerland, 2015 Ammonium nationallicence Cistus albidus nationallicence Mediterranean nationallicence NRA nationallicence Olea europaea nationallicence Root shoot partitioning nationallicence Dias Teresa Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal aut Martins-Loução Maria Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal aut Sheppard Lucy Centre of Ecology and Hydrology - Edinburgh, Bush Estate, EH26 OQB, Penicuik, UK aut Cruz Cristina Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal aut Plant and Soil Springer International Publishing 395/1-2(2015-10-01), 243-252 0032-079X 395:1-2<243 2015 395 11104 https://doi.org/10.1007/s11104-015-2552-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2552-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dias Teresa Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal aut NATIONALLICENCE 700 1- Martins-Loução Maria Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal aut NATIONALLICENCE 700 1- Sheppard Lucy Centre of Ecology and Hydrology - Edinburgh, Bush Estate, EH26 OQB, Penicuik, UK aut NATIONALLICENCE 700 1- Cruz Cristina Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 395/1-2(2015-10-01), 243-252 0032-079X 395:1-2<243 2015 395 11104