High-resolution synchrotron imaging shows that root hairs influence rhizosphere soil structure formation.
High-resolution synchrotron imaging shows that root hairs influence rhizosphere soil structure formation.
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DOI：
10.1111/nph.14705
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发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
Roose T
中科院分区：
文献类型：
--
作者：
Koebernick N;Daly KR;Keyes SD;George TS;Brown LK;Raffan A;Cooper LJ;Naveed M;Bengough AG;Sinclair I;Hallett PD;Roose T
在本文中，我们提供了直接证据的重要性，根毛的孔隙结构的发展在根-土壤界面在作物建立的早期阶段。这是通过使用高分辨率（C。5 μm）同步辐射计算机断层扫描（SRCT），以可视化植物-土壤微观世界中的根毛结构和土壤孔隙结构。两种不同基因型的大麦（大麦），有和没有根毛，在1.2 g cm−3干容重的桑迪壤土中生长8 d。根毛在充满空气的孔隙中可见，但在质地良好的土壤区域中不可见。我们发现，与无毛突变体相比，具有根毛的基因型显著改变了根际可检测孔隙空间（> 5 μm）的孔隙度和连通性。两种基因型都表现出从根表面0.8和0.1 mm之间的孔隙空间减少。有趣的是，根毛轴承基因型有一个显着更大的土壤孔隙体积分数在根-土界面。当使用基于图像的建模进行模拟时，在饱和条件下，估计孔结构对扩散和渗透性的影响在功能上不显著。
In this paper, we provide direct evidence of the importance of root hairs on pore structure development at the root–soil interface during the early stage of crop establishment. This was achieved by use of high‐resolution (c. 5 μm) synchrotron radiation computed tomography (SRCT) to visualise both the structure of root hairs and the soil pore structure in plant–soil microcosms. Two contrasting genotypes of barley (Hordeum vulgare), with and without root hairs, were grown for 8 d in microcosms packed with sandy loam soil at 1.2 g cm−3 dry bulk density. Root hairs were visualised within air‐filled pore spaces, but not in the fine‐textured soil regions. We found that the genotype with root hairs significantly altered the porosity and connectivity of the detectable pore space (> 5 μm) in the rhizosphere, as compared with the no‐hair mutants. Both genotypes showed decreasing pore space between 0.8 and 0.1 mm from the root surface. Interestingly the root‐hair‐bearing genotype had a significantly greater soil pore volume‐fraction at the root–soil interface. Effects of pore structure on diffusion and permeability were estimated to be functionally insignificant under saturated conditions when simulated using image‐based modelling.
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影响因子：
6.9
作者：
Daly KR;Keyes SD;Masum S;Roose T
通讯作者：
Roose T
影响因子：
4.9
作者：
Carminati, Andrea;Moradi, Ahmad B.;Oswald, Sascha E.
通讯作者：
Oswald, Sascha E.
影响因子：
4.9
作者：
DEXTER, AR
通讯作者：
DEXTER, AR
影响因子：
7.2
作者：
Caldwell, DG;McCallum, N;Waugh, R
通讯作者：
Waugh, R
DOI：
10.2136/sssaj1996.03615995006000030031x
发表时间：
1996-05-01
影响因子：
2.9
作者：
Bruand, A;Cousin, I;Begon, JC
通讯作者：
Begon, JC