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The aim of this study was to investigate the effects of different plant parts and the age of plants at harvest as well as N 2  fixing bacterial strains on the N concentration in symbiotic plant parts, especially on the δ 15 N signature of the actinorhizal plants and legumes. The  15 N natural abundance method was used. Two actinorhizal plants were studied:  Alnus incana  (L.) infected with the  Frankia  strains ArI3 or “lsF” (local source of  Frankia ) and  Hippophaë rhamnoides  (L.) infected with the  Frankia  strains T1 or E15b. Two legume species were studied:  Hedysarum coronarium  (L.), infected with a soil suspension, and  Robinia pseudoacacia  (L.), infected with a crushed nodule suspension. It was particularly interesting that in  A. incana , the two  Frankia  strains affected not only N concentration and δ 15 N signature of leaves and roots, but also had an impact on plant growth at first harvest. In  Hippophaë rhamnoides  plants inoculated with the  Frankia  strains T1 and E15b, N concentrations and δ 15 N values did not differ at any harvest time. However, plants nodulated by the  Frankia  strain T1 showed a higher nitrogen fixation rate and higher plant dry matter at all harvesting times. Based on our results for the quantification of N 2  fixation with the “B” value, that is the δ 15 N value of the N 2  fixing plants relying only on N 2  fixation, plant parts, ages and strains should be carefully considered.

The δ15N value of N2 fixing actinorhizal plants and legumes grown with N2 as the only nitrogen source