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- Dictionarycoleoptile/ˌkɒlɪˈɒptʌɪl/
noun
- 1. a sheath protecting a young shoot tip in a grass or cereal.
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Coleoptiles is the first leaf of a monocotyledon which forms a protective sheath about the plumule. These are cylindrical structures that ensheath the shoot apex and first leaf in grass seedlings. It assists in the emergence of the shoot apex (first leaf) by safeguarding it while it passes through the soil.
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 stem in seedlings and eventually, allows the first leaf to emerge. [1]
Coleoptile is different from coleorhiza. Coleorhiza is a sheath-like structure connecting the coleoptile to the primary root, defending the radicle in monocots while the coleoptile is a pointed protective sheath covering the emerging shoot in monocots.
The meaning of COLEOPTILE is the first leaf of a monocotyledon forming a protective sheath about the plumule.
noun. a protective sheath around the plumule in grasses. Collins English Dictionary. Copyright © HarperCollins Publishers. Word origin. C19: from New Latin coleoptilum, from Greek koleon sheath + ptilon down, soft plumage.
cotyledon, seed leaf within the embryo of a seed. Cotyledons help supply the nutrition a plant embryo needs to germinate and become established as a photosynthetic organism and may themselves be a source of nutritional reserves or may aid the embryo in metabolizing nutrition stored elsewhere in the seed.
A protective sheath that covers the young shoot of the embryo in plants of the grass family. It bursts open when the first leaves develop. Experiments investigating growth movements of the oat coleoptile led to the discovery of the plant hormone indoleacetic acid (IAA).
