Coleorhiza

The coleorhiza, coleorrhiza or root sheath is a protective layer of tissue that surrounds the radicle (the embryonic primary root) in monocotyledon seeds.[1] During germination, the coleorhiza is the first part to grow out of the seed, growing through cell elongation. Soon afterwards, it is pierced through by the emerging primary root and then remains like a collar around the root base. Also the adventitious roots have a coleorhiza.

  • Coleorhiza with sweet corn
    Coleorhiza with sweet corn
  • Collar of the coleorhiza and coleoptyl with sweetcorn
    Collar of the coleorhiza and coleoptyl with sweetcorn
  • Grain of wheat. co = coleorhiza, r1 and r2 = root
    Grain of wheat. co = coleorhiza, r1 and r2 = root
  • Corn grain length section, A=Pericarp, B=Aleurone, C=Tip cap, D=Endosperm, E=Coleorhiza, F=Radicle, G=Hypocotyl, H=Plumule, I=Scutellum, J=Coleoptile. Scale=1.4mm.
    Corn grain length section, A=Pericarp, B=Aleurone, C=Tip cap, D=Endosperm, E=Coleorhiza, F=Radicle, G=Hypocotyl, H=Plumule, I=Scutellum, J=Coleoptile. Scale=1.4mm.
  • Root of corn with rootcap and coleorhiza
    Root of corn with rootcap and coleorhiza

References
  1. Barrero, José M.; Talbot, Mark J.; White, Rosemary G.; Jacobsen, John V.; Gubler, Frank (June 2009). "Anatomical and Transcriptomic Studies of the Coleorhiza Reveal the Importance of This Tissue in Regulating Dormancy in Barley". Plant Physiology. 150 (2): 1006–1021. doi:10.1104/pp.109.137901. PMC 2689963. PMID 19386806.
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