丛枝菌根真菌不同品系对土壤磷和氮供应的不同反应

IF 2 3区 农林科学 Q3 ECOLOGY Pedobiologia Pub Date : 2024-01-23 DOI:10.1016/j.pedobi.2024.150934
Brendan Delroy , Hai-Yang Zhang , Andrew Bissett , Jeff R. Powell
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引用次数: 0

摘要

丛枝菌根(AM)结合具有多种功能。它们的两个重要功能是促进寄主植物吸收养分和保护植物免受生物压力等。AM 真菌类群执行这些功能的能力各不相同,对环境选择的反应也不尽相同。因此,有必要更好地了解特定的环境变量会如何改变 AM 真菌群落的反应。在此,我们分析了在澳大利亚各地采集的土壤中基于 DNA 的真菌群落调查数据,以观察土壤氮和磷的可用性与两个据报道功能不同的 AM 真菌类群--巨孢子菌科(被认为对养分吸收更重要)和团伞菌科(被认为对生物压力更重要)--的丰度之间的关系。我们在三种植被类型(草地、森林和林地)中评估了它们之间的关系,以评估它们与土壤营养的关系是否因 AM 真菌的碳可用性而有所不同。随着可用磷的增加,巨孢子菌科真菌的出现频率降低,而团扇菌科真菌的出现频率增加或无反应。在硝酸盐的可用性方面也观察到了类似的模式,但只限于林地。这些模式符合人们的预期,即随着土壤化学肥力的降低,一般来说巨孢子菌科的AM真菌更适合缓解寄主的养分限制。这一知识可能有助于实施最适合未来土地管理和农业项目当地条件的涉及 AM 真菌接种物的最佳策略。
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Divergent responses between lineages of arbuscular mycorrhizal fungi to soil phosphorus and nitrogen availability

Arbuscular mycorrhizal (AM) associations are multifunctional. Two important functions they perform are facilitating nutrient uptake in host plants and protecting plants from biotic stress, among other functions. AM fungal taxa vary in how capably they perform these functions and can also respond differently to environmental selection. Therefore, there is a need to better understand how particular environmental variables might alter the response of AM fungal communities. Here, we analysed data from a DNA-based survey of fungal communities in soils collected throughout Australia to observe relationships among soil nitrogen and phosphorus availability and the abundance of two AM fungal taxa that reportedly vary in function – the Gigasporaceae (putatively more important for nutrient uptake) and Glomeraceae (putatively more important for biotic stress). Relationships were assessed in three vegetation types – grasslands, forests and woodlands – to assess whether associations with soil nutrition varied depending on carbon availability for AM fungi. Fungi from the Gigasporaceae decreased in frequency as available phosphorus increased, while those from the Glomeraceae increased or were unresponsive as available phosphorus increased. Similar patterns were observed for nitrate availability, although only in woodlands. These patterns are consistent with expectations that AM fungi from the Gigasporaceae, in general, are better suited to alleviate nutrient limitation in hosts as soil chemical fertility decreases. This knowledge may aid in implementing optimal strategies involving AM fungal inoculum best suited to the local conditions of future land management and agricultural projects.

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来源期刊
Pedobiologia
Pedobiologia 环境科学-生态学
CiteScore
4.20
自引率
8.70%
发文量
38
审稿时长
64 days
期刊介绍: Pedobiologia publishes peer reviewed articles describing original work in the field of soil ecology, which includes the study of soil organisms and their interactions with factors in their biotic and abiotic environments. Analysis of biological structures, interactions, functions, and processes in soil is fundamental for understanding the dynamical nature of terrestrial ecosystems, a prerequisite for appropriate soil management. The scope of this journal consists of fundamental and applied aspects of soil ecology; key focal points include interactions among organisms in soil, organismal controls on soil processes, causes and consequences of soil biodiversity, and aboveground-belowground interactions. We publish: original research that tests clearly defined hypotheses addressing topics of current interest in soil ecology (including studies demonstrating nonsignificant effects); descriptions of novel methodological approaches, or evaluations of current approaches, that address a clear need in soil ecology research; innovative syntheses of the soil ecology literature, including metaanalyses, topical in depth reviews and short opinion/perspective pieces, and descriptions of original conceptual frameworks; and short notes reporting novel observations of ecological significance.
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