Albalasmeh AA, Ghezzehei TA. 2014. Interplay between soil drying and root exudation in rhizosheath development. Plant and Soil 374: 739–751. Aravena JE, Berli M, Ghezzehei TA, Tyler SW. 2011. Effects of root-induced compaction on rhizosphere hydraulic properties – X-ray microtomography imaging and numerical simulations. Environmental Science & Technology 45: 425–431. Aravena JE, Berli M, Ruiz S, Su�arez F, Ghezzehei TA, Tyler SW. 2014. Quantifying coupled deformation and water flow in the rhizosphere using Xray microtomography and numerical simulations. Plant and Soil 376: 95–110. Bates TR, Lynch JP. 1996. Stimulation of root hair elongation in Arabidopsis thaliana by low phosphorus availability. Plant, Cell & Environment 19: 529–538. Bates TR, Lynch JP. 2001. Root hairs confer a competitive advantage under low phosphorus availability. Plant and Soil 236: 243–250. Bengough AG, Loades K, McKenzie BM. 2016. Root hairs aid soil penetration by anchoring the root surface to pore walls. Journal of Experimental Botany 67: 1071–1078. Bengough AG, McKenzie BM, Hallett PD, Valentine TA. 2011. Root elongation, water stress, and mechanical impedance: a review of limiting stresses and beneficial root tip traits. Journal of Experimental Botany 62: 59–68. Berg G, Smalla K. 2009. Plant species and soil type cooperatively shape the structure and function of microbial communities in the rhizosphere. FEMS Microbiology Ecology 68: 1–13. Brown JM, Kramer PJ, Cofer GP, Johnson GA. 1990. Use of nuclear magnetic resonance microscopy for noninvasive observations of root–soil water relations. Theoretical and Applied Climatology 42: 229–236. Brown LK, George TS, Dupuy LX, White PJ. 2013. A conceptual model of root hair ideotypes for future agricultural environments: what combination of traits should be targeted to cope with limited P availability? Annals of Botany 112: 317–330. Brown LK, George TS, Neugebauer K, White PJ. 2017. The rhizosheath – a potential trait for future agricultural sustainability occurs in orders throughout the Angiosperms. Plant and Soil. doi: 10.1007/s11104-017-3220-2. Brown LK, George TS, Thompson JA, Wright G, Lyon J, Dupuy L, Hubbard SF, White PJ. 2012. What are the implications of variation in root hair length on tolerance to phosphorus deficiency in combination with water stress in barley (Hordeum vulgare)? Annals of Botany 110: 319–328. Bruand A, Cousin I, Nicoullaud B, Duval O, B�egon JC. 1996. Backscattered electron scanning images of soil porosity for analyzing soil compaction around roots. Soil Science Society of America Journal 60: 895–901. Bulgarelli D, Rott M, Schlaeppi K, Ver Loren van Themaat E, Ahmadinejad N, Assenza F, Rauf P, Huettel B, Reinhardt R, Schmelzer E et al. 2012. Revealing structure and assembly cues for Arabidopsis root-inhabiting bacterial microbiota. Nature 488: 91–95. Bulgarelli D, Schlaeppi K, Spaepen S, van Themaat EVL, Schulze-Lefert P. 2013. Structure and functions of the bacterial microbiota of plants. Annual Review of Plant Biology 64: 807–838. Caldwell DG, McCallum N, Shaw P, Muehlbauer GJ, Marshall DF, Waugh R. 2004. A structured mutant population for forward and reverse genetics in barley (Hordeum vulgare L.). Plant Journal 40: 143–150. Caravaca F, Alguacil MM, Torres P, Rold�an A. 2005. Plant type mediates rhizospheric microbial activities and soil aggregation in a semiarid Mediterranean salt marsh. Geoderma 124: 375–382. Carminati A, Moradi AB, Vetterlein D, Vontobel P, Lehmann E, Weller U, Vogel H-J, Oswald SE. 2010. Dynamics of soil water content in the rhizosphere. Plant and Soil 332: 163–176. Carminati A, Vetterlein D. 2013. Plasticity of rhizosphere hydraulic properties as a key for efficient utilization of scarce resources. Annals of Botany 112: 277– 290. Champion RA, Barley KP. 1969. Penetration of clay by root hairs. Soil Science 108: 402–407. Czarnes S, Hallett PD, Bengough AG, Young IM. 2000. Root- and microbialderived mucilages affect soil structure and water transport. European Journal of Soil Science 51: 435–443. Czarnota MA, Paul RN, Weston LA, Duke SO. 2003. Anatomy of Sorgoleone – secreting root hairs of Sorghum species. International Journal of Plant Sciences 164: 861–866. Daly KR, Keyes SD, Masum S, Roose T. 2016. Image-based modelling of nutrient movement in and around the rhizosphere. Journal of Experimental Botany 67: 1059–1070. Daly KR, Mooney SJ, Bennett MJ, Crout NMJ, Roose T, Tracy SR. 2015. Assessing the influence of the rhizosphere on soil hydraulic properties using Xray computed tomography and numerical modelling. Journal of Experimental Botany 66: 2305–2314. Delhaize E, Rathjen TM, Cavanagh CR. 2015. The genetics of rhizosheath size in a multiparent mapping population of wheat. Journal of Experimental Botany 66: 4527–4536. Dexter AR. 1987. Compression of soil around roots. Plant and Soil 97: 401–406. Ehrenfeld JG, Ravit B, Elgersma K. 2005. Feedback in the plant soil system. Annual Review of Environment and Resources 30: 75–115. Feeney DS, Crawford JW, Daniell T, Hallett PD, Nunan N, Ritz K, Rivers M, Young IM. 2006. Three-dimensional microorganization of the soil–root– microbe system. Microbial Ecology 52: 151–158. George TS, Brown LK, Ramsay L, White PJ, Newton AC, Bengough AG, Russell J, Thomas WTB. 2014. Understanding the genetic control and physiological traits associated with rhizosheath production by barley (Hordeum vulgare). New Phytologist 203: 195–205. Grose MJ, Gilligan CA, Spencer D, Goddard BVD. 1996. Spatial heterogeneity of soil water around single roots: use of CT-scanning to predict fungal growth in the rhizosphere. New Phytologist 133: 261–272. Haling RE, Brown LK, Bengough AG, Valentine TA, White PJ, Young IM, George TS. 2014. Root hair length and rhizosheath mass depend on soil porosity, strength and water content in barley genotypes. Planta 239: 643–651. Haling RE, Brown LK, Bengough AG, Young IM, Hallett PD, White PJ, George TS. 2013. Root hairs improve root penetration, root–soil contact, and phosphorus acquisition in soils of different strength. Journal of Experimental Botany 64: 3711–3721. Haling RE, Simpson RJ, Delhaize E, Hocking PJ, Richardson AE. 2010. Effect of lime on root growth, morphology and the rhizosheath of cereal seedlings growing in an acid soil. Plant and Soil 327: 199–212. Hallett PD, Feeney DS, Bengough AG, Rillig MC, Scrimgeour CM, Young IM. 2009. Disentangling the impact of AM fungi versus roots on soil structure and water transport. Plant and Soil 314: 183–196. Head GC. 1964. A study of ‘exudation’ from the root hairs of apple roots by time-lapse cine-photomicrography. Annals of Botany 28: 495–498. Hinsinger P, Bengough AG, Vetterlein D, Young IM. 2009. Rhizosphere: biophysics, biogeochemistry and ecological relevance. Plant and Soil 321: 117–152. Hinsinger P, Gobran GR, Gregory PJ, Wenzel WW. 2005. Rhizosphere geometry and heterogeneity arising from root-mediated physical and chemical processes. New Phytologist 168: 293–303. Keyes SD, Daly KR, Gostling NJ, Jones DL, Talboys P, Pinzer BR, Boardman R, Sinclair I, Marchant A, Roose T. 2013. High resolution synchrotron imaging of wheat root hairs growing in soil and image based modelling of phosphate uptake. New Phytologist 198: 1023–1029. Kut�ılek M, Jendele L, Panayiotopoulos KP. 2006. The influence of uniaxial compression upon pore size distribution in bi-modal soils. Soil and Tillage Research 86: 27–37. Leij FJ, Ghezzehei TA, Or D. 2002. Modeling the dynamics of the soil pore-size distribution. Soil and Tillage Research 64: 61–78. Ma Z, Bielenberg DG, Brown KM, Lynch JP. 2001. Regulation of root hair density by phosphorus availability in Arabidopsis thaliana. Plant, Cell & Environment 24: 459–467. Moreno-Esp�ındola IP, Rivera-Becerril F, de Jes�us Ferrara-Guerrero M, De Le�on-Gonz�alez F. 2007. Role of root-hairs and hyphae in adhesion of sand particles. Soil Biology and Biochemistry 39: 2520–2526. Nimmo JR. 1997. Modeling structural influences on soil water retention. Soil Science Society of America Journal 61: 712–719. Nye PH. 1966. The effect of the nutrient intensity and buffering power of a soil, and the absorbing power, size and root hairs of a root, on nutrient absorption by diffusion. Plant and Soil 25: 81–105. Paganin D, Mayo SC, Gureyev TE, Miller PR, Wilkins SW. 2002. Simultaneous phase and amplitude extraction from a single defocused image of a homogeneous object. Journal of Microscopy 206: 33–40. Peng X, Hallett PD, Zhang B, Horn R. 2011. Physical response of rigid and non-rigid soils to analogues of biological exudates. European Journal of Soil Science 62: 676–684. Renard P, Allard D. 2013. Connectivity metrics for subsurface flow and transport. Advances in Water Resources 51: 168–196. Segal E, Kushnir T, Mualem Y, Shani U. 2008. Water uptake and hydraulics of the root hair rhizosphere. Vadose Zone Journal 7: 1027–1034. Tracy SR, Daly KR, Sturrock CJ, Crout NMJ, Mooney SJ, Roose T. 2015. Three-dimensional quantification of soil hydraulic properties using X-ray computed tomography and image-based modeling. Water Resources Research 51: 1006–1022. Vogel HJ. 1997. Morphological determination of pore connectivity as a function of pore size using serial sections. European Journal of Soil Science 48: 365–377. Vogel HJ, Weller U, Schl€uter S. 2010. Quantification of soil structure based on Minkowski functions. Computers & Geosciences 36: 1236–1245. Vollsnes AV, Futsaether CM, Bengough AG. 2010. Quantifying rhizosphere particle movement around mutant maize roots using time-lapse imaging and particle image velocimetry. European Journal of Soil Science 61: 926–939. Watt M, McCully ME, Canny MJ. 1994. Formation and stabilization of rhizosheaths of Zea mays L. (effect of soil water content). Plant Physiology 106: 179–186. Whalley WR, Riseley B, Leeds-Harrison PB, Bird NRA, Leech PK, Adderley WP. 2005. Structural differences between bulk and rhizosphere soil. European Journal of Soil Science 56: 353–360. White PJ, George TS, Gregory PJ, Bengough AG, Hallett PD, McKenzie BM. 2013. Matching roots to their environment. Annals of Botany 112: 207–222. Young IM. 1995. Variation in moisture contents between bulk soil and the rhizosheath of wheat (Triticum aestivum L. cv Wembley). New Phytologist 130: 135–139. Young IM. 1998. Biophysical interactions at the root–soil interface: a review. The Journal of Agricultural Science 130: 1–7.