Synchrotron X-Ray Microtomography-New Means to Quantify Root Induced Changes of Rhizosphere Physical Properties

Aravena, Jazmín E.; Berli, Markus; Menon, Manoj; Ghezzehei, Teamrat A.; Mandava, Ajay Kumar; Regentova, Emma E.; Pillai, Natarajan Sivathanu; Steude, John; Young, Michael H.; Nico, Peter; Tyler, S. W.

doi:10.2136/sssaspecpub61.c3

Cited by 7 publications

(3 citation statements)

References 120 publications

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“…Carminati et al (2009) used X-ray CT to observe the dynamics of air gaps at a 90-μm resolution in the white lupin rhizosphere in response to wetting and drying cycles. Recent work of Aravena et al (2013) measured compaction and provided new insights into soil-water uptake in sweet pea (Lathyrus odoratus) and sunflower (Helianthus annuus) using a 4.4-μm resolution CT technique.…”

Section: Imaging Techniquesmentioning

confidence: 99%

Phenotyping for Root Traits

Chen

Djalović

Rengel

2015

Phenomics in Crop Plants: Trends, Options and Limitations

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Root system architecture determines crop capacity to acquire water and nutrients in the dynamic and variable soil environment. Increasing attention is paid to searching for optimal root traits to improve resource uptake efficiency and adaptation to heterogeneous soil conditions. This chapter summarises genetic variability and plasticity in root traits relevant to increased efficiency of soil resource acquisition. Approaches available for high-throughput phenotyping of root architecture traits at both laboratory and field scales are critically assessed. The advent of several novel imaging technologies such as X-ray computed tomography coupled with image-analysing software packages offers a great opportunity to non-invasively assess root architecture and its interactions with soil environments. The use of three-dimensional structure-function simulation root models is complementary to phenotyping methods, providing assistance in the crop breeding programmes. We also discuss applications and limitations of these novel visualisation technologies in characterising root growth and the root-soil interactions.

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Section: Imaging Techniquesmentioning

confidence: 99%

Phenotyping for Root Traits

Chen

Djalović

Rengel

2015

Phenomics in Crop Plants: Trends, Options and Limitations

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“…Furthermore, soil pore size distribution is an important soil physical property in relation to root development through their effect on mechanical resistance (Hosseini et al 2016). Some studies have shown that the growth of roots modifies the physical environment by moving soil particles, deforming aggregates and decreasing the number of interaggregate pores (Aravena et al 2013;Pagenkemper et al 2013). The presence of soil macropores significantly benefits root growth (Bennie 1991) because continuous macropores can positively affect the flow of water and nutrients to roots (Hatano et al 1988;Chapman and Miller 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, root-induced macropores are generated mainly within the compact soil layer (Lesturgez et al 2004;Pfeifer et al 2015). In addition, growing roots modify the physical properties of the rhizosphere (Aravena et al 2013), resulting in significant improvements of the macroporosity and intraaggregate porosity of this compact layer (Lesturgez et al 2004). However, the effects of root growth on the soil structure, especially on the three-dimensional (3-D) macropore characteristics, remain poorly understood in alpine environments.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Root Architectures and Soil Macropore Networks Under Different Ecosystems Using X-ray CT Scanning in the Qinghai Lake Watershed, NE Qinghai–Tibet Plateau

2019

J Soil Sci Plant Nutr

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The objectives of this study were to visualise and quantify the soil macropore networks and root architectures within intact soil columns under different ecosystems and to investigate the influences of roots on soil macropore network characteristics. Intact soil columns with diameters of 110 mm and lengths of 400 mm were taken from alpine Kobresia meadow, interspace meadow patches of Potentilla fruticosa shrubs, Potentilla fruticosa shrubs and Artemisia sphaerocephala shrubs in the Qinghai Lake watershed of the NE Qinghai-Tibet Plateau. A Philips medical X-ray CT scanner was used to simultaneously visualise and quantify the soil macropore networks and root architectures. The results showed that macropores and taproots were concentrated in the top 0-150 mm. The root volume density of the P. fruticosa shrub was greater than that of the interspace meadow patches of P. fruticosa shrub and that of the alpine Kobresia meadow. The macroporosity and the root volume density of the soils under the P. fruticosa shrub patches were significantly greater than those in the soils under the other sites. The root volume density was significantly correlated with the macroporosity for the A. sphaerocephala shrubs (R 2 = 0.88) and the P. fruticosa shrubs (R 2 = 0.73). There were significant positive correlations between the volume density, branch density and mean angle of the roots and those of the macropores. Shrub roots invasion played an important role in the formation of macropores. The root volume density was the most important factor for the quantified characteristics and distributions of the macropores.

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