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首页> 外文期刊>Mycologia >Arbuscular mycorrhizal percent root infection and infection intensity of Bromus hordeaceus grown in elevated atmospheric CO2
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Arbuscular mycorrhizal percent root infection and infection intensity of Bromus hordeaceus grown in elevated atmospheric CO2

机译：大气CO 2浓度升高时丛枝菌根的根部感染率和大果布鲁氏菌的感染强度

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摘要

Using Bromus hordeaceus, a grass from a Mediterranean annual grassland in California, changes in infection intensity, rather than the more traditional % root infection, as an indicator of response to elevated atmospheric CO2 and soil nutrient enrichment was measured. Intensity was measured as the number of intraradical hyphae intersecting a microscope cross-hair for specific root diameter size classes. An increase in intensity of infection when plants were exposed to elevated CO2, and a decrease ininfection intensity when plants were fertilized was found. This finding is significant in that it provides evidence for an increase in carbon allocation to the mycobiont under elevated CO2 even in the absence of change in percentage infection, or mycorrhizal root length. Previous studies may therefore have overlooked an important response of arbuscular mycorrhizal fungi to this treatment, leading to an underestimation of the importance of mycorrhizas under elevated CO2. Infection intensity may also change in response to many other treatments and environmental variables that the symbiosis is exposed to, highlighting the potential usefulness of intensity as a response variable in mycorrhizal research.
机译：使用来自加利福尼亚的地中海一年生草原的大果布鲁姆斯草，感染强度的变化，而不是更为传统的根部感染率的变化，被测量为对大气CO2升高和土壤养分富集的响应指标。对于特定的根径尺寸等级，强度测量为与显微镜十字准线相交的自由基内菌丝的数量。当植物暴露于升高的CO 2中时，感染强度增加，而当植物受精时，感染强度降低。这一发现意义重大，因为它提供了即使在感染百分率或菌根根长没有变化的情况下，在二氧化碳浓度升高的情况下，向真菌菌丝碳分配增加的证据。因此，先前的研究可能忽略了丛枝菌根真菌对这种治疗的重要反应，导致低估了CO2浓度升高时菌根的重要性。感染强度也可能会因共生所暴露的许多其他治疗方法和环境变量而发生变化，这突出表明了强度在菌根研究中作为响应变量的潜在用途。

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