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首页> 外文期刊>Plant and Soil >Root growth and presence ofRhizophagus irregularisdistinctly alter substrate hydraulic properties in a model system withMedicago truncatula
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Root growth and presence ofRhizophagus irregularisdistinctly alter substrate hydraulic properties in a model system withMedicago truncatula

机译：用特动的模型系统中的根本生长和存在的血液中的毫无术利地改变基板液压性能

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Aim We investigated how substrate hydraulic properties respond to the presence of arbuscular mycorrhizal fungi (AMF) in root-containing and root-free substrate zones in aMedicago truncatula-Rhizophagus irregularismodel system. Methods Before planting, two compartments constructed from standard soil sampling cores (250 cm(3)) were implanted into non-mycorrhizal and mycorrhizal pots containing a sand-zeolite-soil mix. One compartment allowed root penetration (1 mm mesh cover) and the other only hyphal ingrowth (42 mu m mesh cover). After eight weeks of growth under maintenance of moist conditions, the cores were subjected to water retention measurements. Additionally, we measured water retention of bare substrates before and after drying events to check for successful maintenance of moist conditions in pots. Results Drying of bare substrates decreased water retention, but planting at least sustained it. The parameters of water retention models responded linearly to root morphological traits across mycorrhizal and non-mycorrhizal substrates. Hyphae-only colonization comparatively affected the course of water retention in ways that suggest increased pore space heterogeneity while maintaining water storage capacity of substrates. Conclusions Hence, water contents corresponded to different substrate matric potentials in non-mycorrhizal and mycorrhizal pots. We conclude that changes to water retention in AMF colonized substrates can contribute to a widely observed phenomenon, i.e. that mycorrhizal plants differ in their moisture stress response from non-mycorrhizal plants.
机译：目的研究截形阿米卡果嗜根不规则模型系统中含根和无根基质区丛枝菌根真菌（AMF）的存在对基质水力特性的影响。方法种植前，将标准土壤采样芯（250cm（3））构建的两个隔室植入含有沙沸石土壤混合物的非菌根和菌根盆中。一个隔室允许根穿透（1毫米网盖），另一个仅允许菌丝向内生长（42亩网盖）。在潮湿条件下生长八周后，对岩芯进行保水性测量。此外，我们还测量了干燥前后裸露基质的保水性，以检查能否成功维持罐中的潮湿条件。结果裸露基质的干燥降低了保水性，但种植至少维持了保水性。水分保持模型的参数与菌根和非菌根基质的根系形态特征呈线性关系。仅菌丝定殖相对影响了保水过程，表明孔隙空间异质性增加，同时保持基质的储水能力。结论：因此，在非菌根和菌根盆栽中，水分含量对应于不同的基质电位。我们得出结论，AMF定殖基质中水分保持的变化可能导致一种广泛观察到的现象，即菌根植物与非菌根植物在水分胁迫反应方面存在差异。

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