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Coleoptile
A sheath-like plant organ that surrounds the plumule of a plant embryo or the emerging shoot apex of a seedling. Protects the emerging shoot system as it grows 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. Coleoptiles have two vascular bundles, one on either side. Unlike the flag leaves rolle... Wikipedia
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