Plant roots redesign the rhizosphere to alter the three-dimensional physical architecture and water dynamics

The New Phytologist
Sheikh M F RabbiIain M Young

Abstract

The mechanisms controlling the genesis of rhizosheaths are not well understood, despite their importance in controlling the flux of nutrients and water from soil to root. Here, we examine the development of rhizosheaths from drought-tolerant and drought-sensitive chickpea varieties; focusing on the three-dimensional characterization of the pore volume (> 16 μm voxel spatial resolution) obtained from X-ray microtomography, along with the characterization of mucilage and root hairs, and water sorption. We observe that drought-tolerant plants generate a larger diameter root, and a greater and more porous mass of rhizosheath, which also has a significantly increased water sorptivity, as compared with bulk soil. Using lattice Boltzmann simulations of soil permeability, we find that the root activity of both cultivars creates an anisotropic structure in the rhizosphere, in that its ability to conduct water in the radial direction is significantly higher than in the axial direction, especially in the drought-tolerant cultivar. We suggest that significant differences in rhizosheath architectures are sourced not only by changes in structure of the volumes, but also from root mucilage, and further suggest that breeding for rhizosheath ar...Continue Reading

References

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Citations

Apr 24, 2020·The Plant Journal : for Cell and Molecular Biology·Carla de la Fuente CantóLaurent Laplaze
May 29, 2020·The Plant Journal : for Cell and Molecular Biology·Andrew F GallowayPaul Knox
Jul 16, 2020·Journal of Experimental Botany·Jasmine E Burr-HerseySacha J Mooney
Dec 24, 2018·Scientific Reports·Sheikh M F RabbiIain M Young
Mar 28, 2020·Functional Plant Biology : FPB·Ramces De-Jesús-GarcíaJoseph G Dubrovsky
Mar 23, 2019·Global Change Biology·David A RobinsonMarkus Tuller
Jul 25, 2019·Plants·Hillel Fromm
Aug 15, 2020·Frontiers in Microbiology·Wiam AlsharifHeribert Hirt
Jan 26, 2021·Frontiers in Plant Science·Dylan H JonesDarren M Wells
Feb 23, 2021·Journal of Hydrology·Xiaoxian ZhangWilliam Rickard

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