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

文献类型： 外文期刊

第一作者： Lu, J. K.

作者： Lu, J. K.;Kang, L. H.;Xu, D. P.;Sprent, J. I.;He, X. H.;He, X. H.;He, X. H.

作者机构：

关键词： Bradyrhizobium;Dalbergia odorifera;haustorium;hemiparasite;nitrogen fixation;Santalum album;two-way N transfer

期刊名称：TREE PHYSIOLOGY （ 影响因子：4.196； 五年影响因子：4.727 ）

ISSN： 0829-318X

年卷期： 2013 年 33 卷 5 期

页码：

收录情况： SCI

摘要： 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 N-15 labeling in a pot study. Four paired treatments were used, with N-15 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 N-15 contents were significantly greater in both nodulated D. odorifera and S. album grown with paired nodulated D. odorifera. Significantly higher total plant N-15 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.

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