文献类型：期刊文献

英文题名：Host-species-dependent physiological characteristics of hemiparasite Santalum album in association with N-2-fixing and non-N-2-fixing hosts native to southern China

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

第一作者：陆俊锟

通信作者：Kang, LH[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Zhanjiang 510520, Guangdong, Peoples R China;[2]Univ Sydney, Dept Environm Sci, Eveleigh, NSW 2015, Australia;[3]Univ Western Australia, Sch Plant Biol, Nedlands, WA 6009, Australia

年份：2014

卷号：34

期号：9

起止页码：1006-1017

外文期刊名：TREE PHYSIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000342992200009)】；

基金：This study was supported by the National Science Foundation of China (31300527) and the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFYBB2014QB011).

语种：英文

外文关键词：abscisic acid; amino acids; delta N-15; haustorium; net leaf photosynthesis rate; transpiration

摘要：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.