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Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula
Plant and Soil ( IF 4.9 ) Pub Date : 2020-09-30 , DOI: 10.1007/s11104-020-04723-w
Richard Pauwels , Jan Jansa , David Püschel , Anja Müller , Jan Graefe , Steffen Kolb , Michael Bitterlich

We investigated how substrate hydraulic properties respond to the presence of arbuscular mycorrhizal fungi (AMF) in root-containing and root-free substrate zones in a Medicago truncatula-Rhizophagus irregularis model system. Before planting, two compartments constructed from standard soil sampling cores (250 cm3) 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 μm 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. 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. 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.

中文翻译:

根的生长和不规则根瘤菌的存在明显改变了苜蓿模型系统中的基质水力特性

我们研究了基质水力特性如何对苜蓿 - 不规则根瘤菌模型系统中含根和无根基质区中丛枝菌根真菌 (AMF) 的存在做出反应。种植前,将由标准土壤取样芯(250 cm3)构建的两个隔间植入含有沙-沸石-土壤混合物的非菌根和菌根盆中。一个隔室允许根部穿透(1 mm 网孔覆盖),另一个隔室仅允许菌丝向内生​​长(42 μm 网孔覆盖)。在保持湿润条件下生长八周后,对核心进行保水测量。此外,我们在干燥事件前后测量了裸露基材的保水性,以检查是否成功维持了盆中的潮湿条件。裸露基材的干燥降低了保水性,但种植至少维持了它。保水模型的参数对菌根和非菌根基质的根形态特征呈线性响应。仅菌丝定植相对地影响了保水过程,这表明增加了孔隙空间的异质性,同时保持了基质的储水能力。因此,水含量对应于非菌根盆和菌根盆中不同的底物基质电位。我们得出结论,AMF 定植基质中保水量的变化可导致广泛观察到的现象,即菌根植物与非菌根植物的水分胁迫反应不同。保水模型的参数对菌根和非菌根基质的根形态特征呈线性响应。仅菌丝定植相对地影响了保水过程,这表明增加了孔隙空间的异质性,同时保持了基质的储水能力。因此,水含量对应于非菌根盆和菌根盆中不同的底物基质电位。我们得出结论,AMF 定植基质中保水量的变化可导致广泛观察到的现象,即菌根植物与非菌根植物的水分胁迫反应不同。保水模型的参数对菌根和非菌根基质的根形态特征呈线性响应。仅菌丝定植相对地影响了保水过程,这表明增加了孔隙空间的异质性,同时保持了基质的储水能力。因此,水含量对应于非菌根盆和菌根盆中不同的底物基质电位。我们得出结论,AMF 定植基质中保水量的变化可导致广泛观察到的现象,即菌根植物与非菌根植物的水分胁迫反应不同。仅菌丝定植相对地影响了保水过程,这表明增加了孔隙空间的异质性,同时保持了基质的储水能力。因此,水含量对应于非菌根盆和菌根盆中不同的底物基质电位。我们得出结论,AMF 定植基质中保水量的变化可导致广泛观察到的现象,即菌根植物与非菌根植物的水分胁迫反应不同。仅菌丝定植相对地影响了保水过程,这表明增加了孔隙空间的异质性,同时保持了基质的储水能力。因此,水含量对应于非菌根盆和菌根盆中不同的底物基质电位。我们得出结论,AMF 定植基质中保水量的变化可导致广泛观察到的现象,即菌根植物与非菌根植物的水分胁迫反应不同。
更新日期:2020-09-30
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