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 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
- 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 color. Some of them have anthocyanin pigments imparting purple color
Coleorhiza
- Found in monocot seeds, it is a sheath like structure
- Typically envelops the radicle, connecting the coleoptile to the primary root
- Does not grow to a substantial length 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
| Coleoptile | Coleorhiza | |
| Protective sheath covering of | ||
| Conical protective sheath protecting Young tip in grass enclosing plumule | Undifferentiated sheath enclosing radicle protecting roots of the germination grass | |
| Sheath type | ||
| Protective sheath | Undifferentiated sheath | |
| above/below the soil | ||
| Emerges out of the soil turning into green | Stays within the soil | |
| Envelops this structure | ||
| Plumule | Root cap and radicle | |
| Seed coat | ||
| Breaks through it to elongate | Breaks through it however no growth further | |
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