中国农业科学院机构知识库

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

作者： Lu, J. K. ¹ ; Kang, L. H. ¹ ; Sprent, J. I. ² ; Xu, D. P. ¹ ; He, X. H. ³ ;

作者机构： 1.Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China

2.Univ Dundee, James Hutton Inst, Div Plant Sci, Dundee DD2 5DA, Scotland

3.Yunnan Normal Univ, Sch Life Sci, Kunming 650500, Yunnan, Peoples R China

4.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Crop Nutr & Fertilizat, Minist Agr, Beijing 100081, Peoples R China

5.Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia

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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