Difference Between Coleoptile and Coleorhiza

Both coleorhiza and Coleoptile are types of sheaths emerging from monocot seeds, occurring in the seed before the seed germinates. 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. While coleorhiza stays within the soil, coleoptile emerges out of the soil.

Coleoptile

• The protective sheath of monocot seeds surrounds the tip of the shoot.
• Up to a point, it grows up with the plumule. Flag leaves present within seep the top of the coleoptile and continue growing
• It has two vascular bundles on each side
• As it lacks chlorophyll, typically, it is pale in colour. Some of them have anthocyanin pigments imparting purple colour

Coleorhiza

• Found in monocot seeds, it is a sheath-like structure
• Typically envelops the radicle, connecting the coleoptile to the primary root
• It does not grow to a substantial length and hence stops growing once it emerges from the seed, remaining in the soil

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Difference between Coleoptile and Coleorhiza

The table below depicts a few differences between Coleoptile and Coleorhiza

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