Host-species-dependent physiological characteristics of hemiparasite Santalum album in association with N2-fixing and non-N2-fixing hosts native to southern China
Host-species-dependent physiological characteristics of hemiparasite Santalum album in association with N2-fixing and non-N2-fixing hosts native to southern China
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DOI：
10.1093/treephys/tpu073
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发表时间：
2014-09-01
期刊：
影响因子：
4
通讯作者：
He, X. H.
中科院分区：
文献类型：
--
作者：
Lu, J. K.;Xu, D. P.;He, X. H.
半寄生植物檀香之间相互作用的研究。对檀香人工林的研究具有重要的理论和实践意义。在盆栽试验中，我们测试了两种非固氮植物（Bischofia polycarpa（Levl.）Airy Shaw和Dracontomelon duperreranum Pierre）和两种固氮宿主（Acacia confusa Merr.和降香黄檀Dalbergia odorifera T. Chen）的生长特性和氮素营养的研究。专辑地上部、根和吸器的生物量、N和氨基酸总量均显著高于对照。这张专辑是和两位主持人一起录制的叶片和根系的δ N-15值。album的生长与N-2固定比非N-2固定主机显着降低。S的光合速率和脱落酸（ABA）浓度显著高于其它两个品种。专辑《Grown With D》气味。根木质部汁液中氨基酸的比例相似。专辑和它的主机D. odorifera也是明显的，这表明主要从D. odorifera到S.专辑无论寄主种类如何，S. album明显表现出优化木质部汁液提取从其主机较高的蒸腾和较低的水分利用效率比其主机。两种非固氮寄主的生长情况与S. album的光合速率显著高于未被寄生的处理，而被寄生的处理则表现出较低的生长和光合速率。confusa的根系N、光合作用和蒸腾作用显著降低。与unparasitized处理odorifera比较。此外，叶片阿坝浓度显着高于所有寄主寄生的S。比他们的unparasitized同行专辑。我们的研究可能是第一个报道半寄生虫S. album的研究结果对于理解寄主植物与寄生植物之间的生理相互作用以及成功地混合人工林具有重要意义。专辑D气味。
Understanding the interactions between the hemiparasite Santalum album L. and its hosts has theoretical and practical significance in sandalwood plantations. In a pot study, we tested the effects of two non-N-2-fixing (Bischofia polycarpa (Levl.) Airy Shaw and Dracontomelon duperreranum Pierre) and two N-2-fixing hosts (Acacia confusa Merr. and Dalbergia odorifera T. Chen) on the growth characteristics and nitrogen (N) nutrition of S. album. Biomass production of shoot, root and haustoria, N and total amino acid were significantly greater in S. album grown with the two N-2-fixing hosts. Foliage and root delta N-15 values of S. album were significantly lower when grown with N-2-fixing than with non-N-2-fixing hosts. Significantly higher photosynthetic rates and ABA (abscisic acid) concentrations were seen in S. album grown with D. odorifera. Similarity in the proportional amounts of amino acid of root xylem sap between S. album and its host D. odorifera was also evident, suggesting major access to nitrogenous solutes from D. odorifera to S. album. Irrespective of host species, S. album clearly appeared to optimize xylem sap extraction from its hosts by higher transpiration and lower water-use efficiency than its host. The growth of two non-N-2-fixing hosts parasitized by S. album was significantly greater than the equivalent values for unparasitized treatments, and lower growth and photosynthesis were observed for parasitized A. confusa, and significant decreases in root N, photosynthesis and transpiration for parasitized D. odorifera compared with unparasitized treatments. Furthermore, foliage ABA concentrations were significantly higher in all hosts parasitized by S. album than in their unparasitized counterparts. Our study is probably the first to report on host dependence and preference in the hemiparasite S. album, and the generated results may have important implications for understanding of the physiological interactions between host species and parasitic plants, and for successfully mixing plantations of S. album with D. odorifera.