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首页> 外文期刊>Mycologia >Root-associated fungal community response to drought-associated changes in vegetation community
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Root-associated fungal community response to drought-associated changes in vegetation community

机译：根系真菌群落对植被群落干旱相关变化的响应

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Recent droughts in southwestern USA have led to large-scale mortality of pinon (Pinus edulis) in pinon-juniper woodlands. Pinon mortality alters soil moisture, nutrient and carbon availability, which could affect the root-associated fungal (RAF) communities and therefore the fitness of the remaining plants. We collected fine root samples at a pinon-juniper woodland and a juniper savannah site in central New Mexico. Roots were collected from pinon and juniper (Juniperus monosperma) trees whose nearest neighbors were live pinon, live juniper or dead pinon. RAF communities were analyzed by 454 pyrosequencing of the universal fungal ITS region. The most common taxa were Hypocreales and Chaetothyriales. More than 10% of ITS sequences could not be assigned taxonomy at the phylum level. Two of the unclassified OTUs significantly differed between savanna and woodland, had few like sequences in GenBank and formed new fungal clades with other unclassified RAF from arid plants, highlighting how little study has been done on the RAF of arid ecosystems. Plant host or neighbor did not affect RAF community composition. However, there was a significant difference between RAF communities from woodland vs. savanna, indicating that abiotic factors such as temperature and aridity might be more important in structuring these RAF communities than biotic factors such as plant host or neighbor identity. Ectomycorrhizal fungi (EM) were present in juniper as well as pinon in the woodland site, in contrast with previous research, but did not occur in juniper savanna, suggesting a potential shared EM network with juniper RAF richness was lower in hosts that were neighbors of the opposite host. This may indicate competitive exclusion between fungi from different hosts Characterizing these communities and their responses to environment and plant neighborhood is a step toward understanding the effects of drought on a biome that spans 19 000 000 ha of southwestern USA.
机译：美国西南部地区最近的干旱导致松柏林中大规模的松柏（Pinus edulis）死亡。松树死亡率会改变土壤的水分，养分和碳的利用率，从而影响根系真菌（RAF）群落，从而影响其余植物的适应性。我们在新墨西哥州中部的松柏杜松林地和杜松大草原场地收集了细根样品。从松树和杜松（Juniperus monosperma）树中收集根，松树和杜松的最近邻居是活松子，活杜松或死松子。通过对通用真菌ITS区进行454焦磷酸测序分析了RAF群落。最常见的分类群是猪po和甲壳纲。无法在门类级别分配超过10％的ITS序列分类。在热带稀树草原和林地之间，有两个未分类的OTU存在显着差异，在GenBank中几乎没有类似的序列，并且与来自干旱植物的其他未分类的RAF形成了新的真菌进化枝，突显了对干旱生态系统的RAF进行的研究很少。植物寄主或邻居没有影响英国皇家空军的社区组成。然而，林地和热带稀树草原的RAF群落之间存在显着差异，表明在构建这些RAF群落时，非生物因素（例如温度和干旱）可能比植物宿主或邻居身份等生物因素更为重要。与先前的研究相比，杜松和林地中的松子均存在外生菌根真菌（EM），但杜松大草原上并未出现这种现象，这表明与杜松RAF富集的潜在共享EM网络在与之相邻的寄主中较低对面的主机。这可能表明不同宿主真菌之间存在竞争性排斥，表征这些群落及其对环境和植物邻里的反应是朝着了解干旱对跨越美国西南部19000000公顷生物群落的影响迈出的一步。

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