2009
DOI: 10.2136/vzj2008.0147
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When Roots Lose Contact

Abstract: It has been speculated that during periods of water deficit, roots may shrink and lose contact with the soil, with a consequent reduction in root water uptake. Due to the opaque nature of soil, however, this process has never been observed in situ for living plants. Through x‐ray tomography and image analysis, we have demonstrated the formation and dynamics of air gaps around roots. The high spatial resolution required to image the soil–root gaps was achieved by combining tomography of the entire sample (field… Show more

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Cited by 150 publications
(99 citation statements)
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“…Tomography reconstruction and image processing were described by Carminati et al (2009). Based on the large field of view, identification of roots was done following a segmentation protocol: first we applied a diffusion filter based on total variation (Rudin et al 1992).…”
Section: Methodsmentioning
confidence: 99%
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“…Tomography reconstruction and image processing were described by Carminati et al (2009). Based on the large field of view, identification of roots was done following a segmentation protocol: first we applied a diffusion filter based on total variation (Rudin et al 1992).…”
Section: Methodsmentioning
confidence: 99%
“…Today, recent advances in X-ray computer tomography allow visualization of roots in soil in samples large enough to accommodate three-dimensional root growth at the spatial resolution required to observe gaps at the root-soil interface. By using local tomography and zooming inside the sample, Carminati et al (2009) were able to monitor the formation of gaps at the interface between roots of a lupin in a sandy soil with a spatial resolution of 0.1 mm. Higher resolution (pixel size of 4.4 μm) was achieved by Aravena et al (2011).…”
Section: Introductionmentioning
confidence: 99%
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“…mucilage, around roots changes rhizosphere hydraulic properties thereby enhancing water availability (Carminati et al 2011). Hydraulic resistance between root surface and rhizosphere soil is highly dynamic involving variable hydraulic behaviour of dry and wet mucilage as well as root shrinkage and air gap formation that are functionally related to avoid water loss from roots-which, contrary to leaves, do not have a protective cuticle-into dry soil (Carminati et al 2009). Once water has moved towards the root surface, flow towards the xylem has to overcome root radial resistance.…”
Section: Plant Properties and Processesmentioning
confidence: 99%
“…A perda de turgor pode ser acompanhada de diminuição de até 50 % no diâmetro das raízes (Huck et al, 1970), efeito também verificado por Bois & Couchat (1983). Por meio de imageamento do sistema radicular de tremoço branco (Lupinus albus L.) com tomografia de raios-X, Carminati et al (2009) verificaram que, após severo estresse hídrico (0,025 m 3 m -3 de água num solo arenoso), espaços preenchidos com ar foram detectados na interface solo-raiz, no ápice da raiz principal e ao longo das raízes laterais. Restabelecido o turgor após irrigação (0,135 m 3 m -3 de água no solo), houve aumento de 20 a 50 % do diâmetro das raízes.…”
Section: Círculos Preenchidos) Os Trechos Pontilhados Representam O unclassified