Biology:Pericycle
The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outer most part of the stele of plants.[citation needed]
Although it is composed of non-vascular parenchyma cells, it's still considered part of the vascular cylinder because it arises from the procambium as do the vascular tissues it surrounds.[citation needed]
In eudicots, it also has the capacity to produce lateral roots. Branch roots arise from this primary meristem tissue. In plants undergoing secondary growth, the pericycle contributes to the vascular cambium often diverging into a cork cambium.[citation needed]
In angiosperms certain molecules within the endodermis and the surrounding vasculature are sent to the pericycle which promotes the growth of the root meristems.[citation needed]
Location
The pericycle is located between the endodermis and phloem in plant roots. In dicot stems, it is situated around the ring of vascular bundles in the stele.[1]
Function
In dicot roots, the pericycle strengthens the roots and provides protection for the vascular bundles.[citation needed]
In dicot root, the vascular cambium is completely secondary in origin, and it originates from a portion of pericycle tissue.[citation needed]
The pericycle regulates the formation of lateral roots by rapidly dividing near the xylem elements of the root.[2]
It has been known to often be confused with other parts of the plant. However, its unique ring structure allows it to be more easily identified.[citation needed]
Past efforts to isolate such tissue have been successful. Monocot roots rarely branch, but can, and this branch will originate from the pericycle.[citation needed]
References
- ↑ Beeckman, Tom; De Smet, Ive (2014). "Pericycle". Current Biology 24 (10): R378–9. doi:10.1016/j.cub.2014.03.031. PMID 24845660.
- ↑ Laskowski, M. J.; Williams, M. E.; Nusbaum, H. C.; Sussex, I. M. (1995). "Formation of lateral root meristems is a two-stage process". Development 121 (10): 3303–10. PMID 7588064. http://dev.biologists.org/cgi/pmidlookup?view=long&pmid=7588064.
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