文献类型：期刊文献

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

作者：Lu, J. K.[1] Kang, L. H.[1] Sprent, J. I.[2] Xu, D. P.[1] He, X. H.[3,4,5]

第一作者：陆俊锟

通信作者：Xu, DP[1]

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

年份：2013

卷号：33

期号：5

起止页码：464-474

外文期刊名：TREE PHYSIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000319430900003)】；

基金：This study was financially supported by the National Natural Science Foundation of China (31170582) and the Guangdong Forestry Science and Technology for Creativity and Special Fund, China (2009KJCX002-01).

语种：英文

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

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.