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首页> 外文期刊>Mycologia >Contamination by uranium mine drainages affects fungal growth and interactions between fungal species and strains.
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Contamination by uranium mine drainages affects fungal growth and interactions between fungal species and strains.

机译：铀矿排泄物的污染会影响真菌的生长以及真菌种类与菌株之间的相互作用。

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The presence of aquatic hyphomycetes has been reported for several heavy metal-contaminated waters. Tolerance probably is one adaptation to coping with heavy metals. To help clarify this issue strains of two species of aquatic hyphomycetes (Tricladium splendens Ingold and Varicosporium elodeae Kegel) were isolated from a reference stream and a stream contaminated with heavy metals and grown on malt extract agar prepared with reference and contaminated water to characterize colony morphology, growth rate, growth inhibition and interaction among species and strains. In V. elodeae the morphology of colonies differed between strains. Colony diameter increased linearly over time with growth rates being lower for strains isolated from contaminated than from reference streams (mostly for V. elodeae). Strains from the contaminated stream grew faster in medium prepared with contaminated water than in medium prepared with reference water, while for strains from the reference stream there was no significant difference in growth rates on the two media. In interacting isolates radial growth toward the opposing colony was generally lower than toward the dish edge. Percentage growth inhibition was higher for isolates in intraspecific interactions (13-37%) than in interspecific interactions (3-27%). However differences in growth inhibition experienced by interacting isolates were observed only in three cases out of 16. The difference between the percentage inhibition caused and experienced by a given isolate was highest in interactions involving isolates with distinct growth rates. Our results suggest that strains from the reference stream tolerate heavy metals while strains from the contaminated stream seem to be adapted to contaminated waters. We hypothesize that in natural environments fungal species-specific limits of tolerance to metal contamination might determine an abrupt or gradual response of the original fungal community to mine pollution giving origin to a poorer fungal community dominated by adapted strains with distinct functional efficiency.
机译：据报道，几种重金属污染的水中都存在水生真菌。宽容可能是应对重金属的一种适应方式。为了帮助澄清这个问题，从参考流和被重金属污染的流中分离了两种水生浮萍菌（ Tricladium splendens Ingold和 Varicosporium elodeae Kegel）的菌株。用参考水和污染水制备的麦芽提取物琼脂，以表征菌落形态，生长速率，生长抑制以及物种和菌株之间的相互作用。在 V中。菌株之间的菌落形态不同。从污染中分离出的菌株的菌落直径随时间呈线性增长，而从参考流中分离出来的菌落则更低（大多数是 V。elodeae ）。在用污染水制备的培养基中，来自污染流的菌株的生长比在用参比水制备的培养基中的生长快，而对于来自参比流的菌株，两种培养基的生长速率没有显着差异。在相互作用的分离物中，朝向相对菌落的径向生长通常低于朝向培养皿边缘。在种内相互作用中，分离株的生长抑制百分比更高（13-37％），而在种间相互作用中则更高（3-27％）。但是，仅在16个案例中的3个案例中观察到了相互作用的分离株经历的生长抑制差异。在涉及具有不同生长速率的分离株的相互作用中，给定分离株引起和经历的抑制百分比之间的差异最大。我们的结果表明，来自参考流的菌株可以耐受重金属，而来自受污染流的菌株似乎可以适应受污染的水。我们假设，在自然环境中，真菌对金属污染的耐受性特定的极限可能决定原始真菌群落对矿山污染的突然或逐渐反应，从而导致以适应性菌株为首的较弱的真菌群落具有明显的功能效率。

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