Summary
The root sheath of the arid zone grassZygochloa paradoxa comprises a dense cylinder of sand grains held mainly by short twisted root hairs. The sand sheath and hypodermal sleeve enclose a thick cortex with a sclerenchymatous inner zone and a partially disintegrated aerenchymatous outer zone. The outer tube comprising sheath and hypodermal sleeve is largely impermeable to water and its primary function is probably to insulate the stele against moisture loss during translocation.
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Buckley, R. Sand rhizosheath of an arid zone grass. Plant Soil 66, 417–421 (1982). https://doi.org/10.1007/BF02183809
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DOI: https://doi.org/10.1007/BF02183809