The ectomycorrhizal specialist orchid Corallorhiza trifida is a partial myco-heterotroph.
The ectomycorrhizal specialist orchid Corallorhiza trifida is a partial myco-heterotroph.
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DOI：
10.1111/j.1469-8137.2007.02362.x
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发表时间：
2008-04
期刊：
影响因子：
--
通讯作者：
K. Zimmer;Cornelia Meyer;G. Gebauer
中科院分区：
文献类型：
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作者：
K. Zimmer;Cornelia Meyer;G. Gebauer
无叶的环寒带兰花Corallorhiza trifida通常被认为是完全真菌异养的，尽管关于其光合作用能力的证据相反。在这里，其真菌异养水平通过分析稳定的氮和碳同位素（15）N和（13）C的天然丰度分别进行评估。结果表明，在不同的处理条件下，C. trifida进行了研究，并对9个C.来自中欧的trifida个体与邻近的专性自养和真菌异养参考植物进行了比较。结果表明，C. trifida只获得c.其总氮的52 +/- 5%和来自真菌的碳的77 +/- 10%，即使它已被证明专门针对一个特定的外生菌根真菌复合体，类似于完全的真菌异养兰花。同时，与珊瑚根属其他物种相比，珊瑚根C.三裂藻含有大量的叶绿素自从C.三裂叶菌能够通过与自养植物相同的过程来供应其氮和碳需求的显著比例，该物种应被称为部分真菌异养的。
The leafless, circumboreal orchid Corallorhiza trifida is often assumed to be fully myco-heterotrophic despite contrary evidence concerning its ability to photosynthesize. Here, its level of myco-heterotrophy is assessed by analysing the natural abundance of the stable nitrogen and carbon isotopes (15)N and (13)C, respectively. The mycorrhizal associates and chlorophyll contents of C. trifida were investigated and the C and N isotope signatures of nine C. trifida individuals from Central Europe were compared with those of neighbouring obligate autotrophic and myco-heterotrophic reference plants. The results show that C. trifida only gains c. 52 +/- 5% of its total nitrogen and 77 +/- 10% of the carbon derived from fungi even though it has been shown to specialize on one specific complex of ectomycorrhizal fungi similar to fully myco-heterotrophic orchids. Concurrently, compared with other Corallorhiza species, C. trifida contains a remarkable amount of chlorophyll. Since C. trifida is able to supply significant proportions of its nitrogen and carbon demands through the same processes as autotrophic plants, this species should be referred to as partially myco-heterotrophic.