Tennakoon Kushan U, Chak Wang H, Bolin Jay F
Biology Program, Faculty of Science, University of Brunei Darussalam, Tungku Link, Gadong, BE 1410, Brunei Darussalam.
Department of Botany, Smithsonian Institution, PO Box 37012, NMNH MRC-166, Washington, DC 20013, USA.
Funct Plant Biol. 2011 Jun;38(6):505-513. doi: 10.1071/FP10211.
Our understanding of mineral nutrition and carbon heterotrophy in mistletoes is derived largely from arid and temperate plant communities. Sharp differences between the tropical, temperate and arid communities, such as seasonality, water availability and mean temperature may influence basic assumptions regarding mistletoe physiology. Thus, we present mineral nutrition profiles and natural abundance carbon and nitrogen stable isotope data for tropical mistletoes and their hosts. Parasite-host mineral nutrition profiles were estimated for three Loranthaceous mistletoes: Scurrula ferruginea Danser, Macrosolen cochinchinensis Blume, and Dendrophthoe curvata Blume and 12 unique mistletoe-host associations. δ13C and δ15N values were estimated for 12 parasite-host associations. Differences between host and parasite δ13C values were small but showed significant depletion in mistletoe leaves compared with the distal branch and proximal branch host leaves. Host and mistletoe δ13C values were uncorrelated whereas δ15N values were significantly correlated, demonstrating mistletoe N dependence. Concentrations of K were higher in mistletoes relative to hosts and significantly higher for Dendrophthoe host associations. For Scurrula and Macrosolen, mean mistletoe-host concentrations of major and minor elements did not differ significantly.
我们对槲寄生中矿物质营养和碳异养的理解很大程度上源于干旱和温带植物群落。热带、温带和干旱群落之间的显著差异，如季节性、水分可利用性和平均温度，可能会影响关于槲寄生生理学的基本假设。因此，我们展示了热带槲寄生及其寄主的矿物质营养概况以及天然丰度碳和氮稳定同位素数据。对三种桑寄生科槲寄生：锈毛钝果寄生（Scurrula ferruginea Danser）、鞘花（Macrosolen cochinchinensis Blume）和弯枝寄生（Dendrophthoe curvata Blume）以及12种独特的槲寄生 - 寄主组合进行了寄生虫 - 寄主矿物质营养概况评估。对12种寄生虫 - 寄主组合的δ13C和δ15N值进行了评估。寄主和寄生虫的δ13C值差异较小，但与寄主的远枝和近枝叶片相比，槲寄生叶片显示出显著贫化。寄主和槲寄生的δ13C值不相关，而δ15N值显著相关，表明槲寄生对氮的依赖性。相对于寄主，槲寄生中钾的浓度更高，对于弯枝寄生的寄主组合则显著更高。对于锈毛钝果寄生和鞘花，主要和微量元素的槲寄生 - 寄主平均浓度没有显著差异。
