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Nutrient translocation from a host plant is vital to the growth and survival of its root parasitic plant, but few studies have investigated whether a parasitic plant is also able to transfer nutrients to its host. The role of N 2 -fixation in nitrogen (N) transfer between 7-month-old  Dalbergia odorifera  T. Chen nodulated with  Bradyrhizobium elkanii  DG and its hemiparasite  Santalum album  Linn. was examined by external  15 N labeling in a pot study. Four paired treatments were used, with  15 N given to either host or hemiparasite and the host either nodulated or grown on combined N. N 2 -fixation supplied 41–44% of total N in  D. odorifera . Biomass, N and  15 N contents were significantly greater in both nodulated  D. odorifera  and  S. album  grown with paired nodulated  D. odorifera . Significantly higher total plant  15 N recovery was in N donor  D. odorifera  (68–72%) than in N donor  S. album  (42–44%), regardless of the nodulation status in  D. odorifera.  Nitrogen transfer  to S. album  was significantly greater (27.8–67.8 mg plant −1 ) than to  D. odorifera  (2.0–8.9 mg plant −1 ) and 2.4–4.5 times greater in the nodulated pair than in the non-nodulated pair. Irrespective of the nodulation status,  S. album  was always the N-sink plant. The amount of two-way N transfer was increased by the presence of effective nodules, resulting in a greater net N transfer (22.6 mg plant −1 ) from host  D. odorifera  to hemiparasite  S. album.  Our results may provide N management strategies for  D. odorifera/S. album  mixed plantations in the field.

tree physiology

Two-way transfer of nitrogen between  Dalbergia odorifera  and its hemiparasite  Santalum album  is enhanced when the host is effectively nodulated and fixing nitrogen