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首页> 外文期刊>Mycologia >Suppression of root-endogenous fungi in persistently inundated Typha roots
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Suppression of root-endogenous fungi in persistently inundated Typha roots

机译：在持续淹没的汤匙根系中抑制根内源性真菌

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摘要

Wetland soils are defined by anoxic and reducing conditions that impose biogeochemically hostile conditions on plant roots and their endogenous fungal communities. The cosmopolitan wetland plant Typha L. mitigates root-zone anoxia efficiently, such that roots of these plants may constitute fungal habitats similar to roots in subaerially exposed soils. Alternatively, fungi may compete with plant cells for limited oxygen in inundated roots. We hypothesized that extrinsic environmental factors may reduce fungal incidence and affect fungal community structure within inundated roots as compared with those in subaerially exposed soils. We sampled roots of Typha spp. plants across inundation gradients in constructed reservoirs; root subsamples were microscopically examined for fungal structures, and morphologically distinct fungal endophytes were cultured and isolated from surface-sterilized subsamples. We found that the incidence of fungal hyphae was suppressed for all types of vegetative mycelia when roots were inundated, regardless of depth, but that there were no obvious differences in community composition of fungi cultured from roots growing in inundated versus subaerially exposed soils. This suggests that the suppression of hyphae we observed in root samples did not result from changes in community composition. Instead, low hyphal incidence in inundated Typha roots may reflect germinal inhibition or unsuccessful initial colonization, possibly owing to plant-mediated redox dynamism in the surrounding soil. No variation was seen in the incidence of asexual spores, or chytridiomycetes, nor were there significant differences between geographically disparate sampling sites. Communities of root-endogenous fungi may therefore be influenced more strongly by external environmental factors than by the environments that plant roots comprise.
机译：湿地土壤由缺氧和还原条件限定，对植物根部和其内源性真菌群落施加生物地理化学敌对条件。 COSOMOPOLITAN湿地植物TYPHA L.有效减轻根区缺氧，使得这些植物的根可能构成类似于亚阶层暴露的土壤中的根部的真菌栖息地。或者，真菌可以与淹没根部有限氧的植物细胞竞争。我们假设外在环境因素可能会降低真菌发病率，并与亚洲暴露的土壤中的那些相比，在淹没的根系中影响真菌群落结构。我们采样了Typha SPP的根源。建造水库淹没梯度的植物;根部归位被显微检查用于真菌结构，并且形态学上不同的真菌内心细胞培养并与表面灭菌的副样片分离。我们发现，当根被淹没时，无论是深度都是淹没的，抑制了真菌菌丝的发生率，但无论深度，植物群体组成没有明显差异，从根状地生长的根系生长的根源培养。这表明我们在根样本中观察到的菌丝的抑制不会因群落组成的变化而导致。相反，淹没的Typha根中的低亚腿发射可能反映出发型抑制或不成功的初始定植，可能由于植物介导的植物介导的氧化还原在周围土壤中的氧化还原活性。无性孢子的发病率没有任何变异，或尖锐霉素，地理位置不同的抽样网站之间存在显着差异。因此，根内源性真菌的社区可能受到外部环境因素的影响更强烈的影响，而不是植物根部包含的环境。

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