A methodological approach to improve estimates of nutrient gains by partially myco-heterotrophic plants

A methodological approach to improve estimates of nutrient gains by partially myco-heterotrophic plants
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改进部分真菌异养植物养分增益估计的方法学方法

DOI:
10.1080/10256010802507458
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发表时间:
2008
影响因子:
1.3
通讯作者:
Gebauer G.
Gebauer G.
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Preiss K;Gebauer G.

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稳定同位素15N和13C可用于研究陆生兰科植物和木栓类植物的营养模式。这些植物中的一些是腐殖自养的,但通过从菌根真菌获得有机化合物(例如氨基酸)来满足它们的氮和碳需求。这种所谓的部分真菌异养营养反映了他们的同位素签名。应用双源线性混合模型对这些植物的δ值进行计算,可以计算出来自其相关的菌根真菌的N和C的百分比。在这里,我们提出了一种方法,以提高估计的植物的真菌异养的程度。由于将δ值转换为富集因子(EEF),结果获得了更好的分辨率,并且来自各种研究的数据变得标准化,这有助于组合表示和荟萃分析。
The stable isotopes15N and13C can be used to investigate the nutritional mode of terrestrial orchids and pyroloids (Monotropoideae, Ericaceae). Some of these plants are putatively autotrophic but meet their nitrogen and carbon demands by gaining organic compounds (e.g. amino acids) from mycorrhizal fungi. This so-called partially myco-heterotrophic nutrition is reflected by their isotope signature. The application of a two-source linear mixing model on δ values of such plants allows calculating the percentage of N and C derived from their associated mycorrhizal fungi. Here we present an approach to improve estimates of the plants’ degree of myco-heterotrophy. Due to the presented conversion of δ values into enrichment factors (ϵ), results obtain a better resolution and data from various studies become normalised which facilitates combined representations and meta-analyses.
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