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首页> 外文期刊>Bryologist >Genotype variability of Nostoc symbionts associated with three epiphytic Nephroma species in a boreal forest landscape
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Genotype variability of Nostoc symbionts associated with three epiphytic Nephroma species in a boreal forest landscape

机译：与北方林景三种果皮肾脏物种相关的Nostoc Symphion的基因型变异性

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摘要

We studied lichen photobiont diversity patterns of three epiphytic Nephroma species in a 900-ha boreal forest landscape using cyanobacterial tRNA(Leu) (UAA) intron sequences. Our aim was to investigate if there was a link between lichen species identity, reproductive strategy, and photobiont selectivity. We show high photobiont specificity and selectivity within the forest landscape: only five closely related tRNA(Leu) (UAA) intron genotypes were found from 232 Nephroma thalli. Two Nostoc genotypes were shared by N. bellum and N. resupinaturn, while N. parile associated with two different genotypes. One genotype was only found from some specimens of N. resupinaturn. On a single tree trunk all thalli of an individual lichen species usually housed the same photobiont strain, and the lichen species that mainly dispersed with fungal diaspores (N. bellum and N. resupinaturn) usually shared identical photobionts. Both patterns were attributed to a founder effect presumably caused by relatively low colonization rates between trees. The photobiont spectrum of the symbiotically dispersing N. parile indicates that it maintained its own cyanobacterial symbionts. Our study shows that mycobionts of the diverse Nephroma guild do not exchange their cyanobacterial photobionts at random, and that reproductive strategy is reflected in species photobiont choice.
机译：使用蓝藻TRNA（LEU）内含子序列，在900-HA Boreal Forest景观中研究了三种外膜肾瘤物种的地衣光伏分样图案。我们的目的是调查地衣物种身份，生殖策略和Photobiont选择性之间存在联系。我们在森林景观内显示出高的Photobiont特异性和选择性：从232个肾脏炎症中发现了只有五个密切相关的TRNA（Leu）内含子基因型。由N.Bellum和N.Resupinaturn共享两种Nostoc基因型，而与两种不同的基因型相关的N.Axii。从N.Resupinaturn的一些标本中发现一种基因型。在一棵树架上，所有地衣种类的所有Thalli通常都是相同的Photobiont菌株，以及主要分散在真菌缺血（N.Bellum和N.Resupinaturn）的地衣种类通常共享相同的光子。这两种模式都归因于树木之间具有相对低的定植率引起的创始效果。符合符号的Photobiont谱的谱分散N.Axi ile表明它保持其自身的蓝细菌共生。我们的研究表明，不同的肾病公会的肌肉不随意交换它们的蓝细菌光纤，并且生殖策略在物种Photobiont选择中反映。

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