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000840069 1001_ $$00000-0001-6187-2935$$aPflugfelder, Daniel$$b0$$eCorresponding author
000840069 245__ $$aNon-invasive imaging of plant roots in different soils using magnetic resonance imaging (MRI)
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000840069 520__ $$aBackgroundRoot systems are highly plastic and adapt according to their soil environment. Studying the particular influence of soils on root development necessitates the adaptation and evaluation of imaging methods for multiple substrates. Non-invasive 3D root images in soil can be obtained using magnetic resonance imaging (MRI). Not all substrates, however, are suitable for MRI. Using barley as a model plant we investigated the achievable image quality and the suitability for root phenotyping of six commercially available natural soil substrates of commonly occurring soil textures. The results are compared with two artificially composed substrates previously documented for MRI root imaging.ResultsIn five out of the eight tested substrates, barley lateral roots with diameters below 300 µm could still be resolved. In two other soils, only the thicker barley seminal roots were detectable. For these two substrates the minimal detectable root diameter was between 400 and 500 µm. Only one soil did not allow imaging of the roots with MRI. In the artificially composed substrates, soil moisture above 70% of the maximal water holding capacity (WHCmax) impeded root imaging. For the natural soil substrates, soil moisture had no effect on MRI root image quality in the investigated range of 50–80% WHCmax.ConclusionsAlmost all tested natural soil substrates allowed for root imaging using MRI. Half of these substrates resulted in root images comparable to our current lab standard substrate, allowing root detection down to a diameter of 300 µm. These soils were used as supplied by the vendor and, in particular, removal of ferromagnetic particles was not necessary. With the characterization of different soils, investigations such as trait stability across substrates are now possible using noninvasive MRI.
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000840069 7001_ $$0P:(DE-Juel1)129360$$aMetzner, Ralf$$b1$$ufzj
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000840069 7001_ $$0P:(DE-Juel1)167469$$aReichel, Rüdiger$$b3$$ufzj
000840069 7001_ $$0P:(DE-Juel1)129336$$aJahnke, Siegfried$$b4$$ufzj
000840069 7001_ $$0P:(DE-Juel1)165733$$aKoller, Robert$$b5$$ufzj
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