The coleorhiza or root sheath is a protective layer of tissue that surrounds the

radicle In botany, the radicle is the first part of a seedling (a growing plant embryo) to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil (the shoot emerges from t ...

(the embryonic primary root) in

monocotyledon Monocotyledons (), commonly referred to as monocots, ( Lilianae '' sensu'' Chase & Reveal) are flowering plants whose seeds contain only one embryonic leaf, or cotyledon. A monocot taxon has been in use for several decades, but with various ranks ...

seed In botany, a seed is a plant structure containing an embryo and stored nutrients in a protective coat called a ''testa''. More generally, the term "seed" means anything that can be Sowing, sown, which may include seed and husk or tuber. Seeds ...

s. 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 root Important structures in plant development are buds, Shoot (botany), shoots, roots, leaf, leaves, and flowers; plants produce these tissues and structures throughout their life from meristems located at the tips of organs, or between mature tissues. ...

s have a coleorhiza. Zea mays coleorhiza (02).jpg, Coleorhiza with sweet corn Zea mays coleorhiza coleoptyl (02).jpg, Collar of the coleorhiza and

coleoptile Coleoptile is the pointed protective sheath covering the emerging shoot in monocotyledons such as grasses in which few leaf primordia and shoot apex of monocot embryo remain enclosed. The coleoptile protects the first leaf as well as the growing ...

with sweetcorn Triticum aestivum seed (01).jpg, Grain of wheat. co = coleorhiza, r¹ and r² = root Zea Kernal L.jpg, 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 Coleoptile is the pointed protective sheath covering the emerging shoot in monocotyledons such as grasses in which few leaf primordia and shoot apex of monocot embryo remain enclosed. The coleoptile protects the first leaf as well as the growing ...

. Scale=1.4mm. Radicle or Embryonic Root in Zea Mays Embryo (47636870242).jpg, Root of corn with rootcap and coleorhiza

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Difference
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and coleorhiza Definition of coleoptile : The plumule are enclosed in sheaths which are called coleoptile. They protect the plumule for future, as in future it develops into shoot. Plant anatomy