# Pericycle

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> Source: https://en.wikipedia.org/wiki/Pericycle
> Source revision: 1345217011
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{{Short description|Layer of parenchyma or sclerenchyma cells}}
{{Refimprove|date=May 2016}}
The '''pericycle''' is a cylinder of [parenchyma](/source/Ground_tissue) or [sclerenchyma](/source/sclerenchyma) cells that lies just inside the [endodermis](/source/endodermis) and is the outer most part of the [stele](/source/stele_(biology)) of plants.{{Citation needed|date=August 2023}}

Although it is composed of non-vascular [parenchyma](/source/parenchyma) cells, it is still considered part of the vascular cylinder because it arises from the procambium as do the vascular tissues it surrounds.{{Citation needed|date=August 2023}}

In [eudicots](/source/eudicots), it also has the capacity to produce [lateral roots](/source/lateral_roots). Branch roots arise from this primary [meristem](/source/meristem) tissue. In plants undergoing [secondary growth](/source/secondary_growth), the pericycle contributes to the [vascular cambium](/source/vascular_cambium) often diverging into a [cork cambium](/source/cork_cambium).{{Citation needed|date=August 2023}}

In [angiosperms](/source/angiosperms) certain molecules within the [endodermis](/source/endodermis) and the surrounding vasculature are sent to the pericycle which promotes the growth of the root [meristem](/source/meristem)s.{{Citation needed|date=August 2023}}

== Location ==

The pericycle is located between the [endodermis](/source/endodermis) and phloem in plant roots.  In [dicot](/source/Dicotyledon) stems, it is situated around the ring of vascular bundles in the stele.<ref>{{cite journal |doi=10.1016/j.cub.2014.03.031 |pmid=24845660 |title=Pericycle |journal=Current Biology |volume=24 |issue=10 |pages=R378–9 |year=2014 |last1=Beeckman |first1=Tom |last2=De Smet |first2=Ive |doi-access=free |bibcode=2014CBio...24.R378B }}</ref>

== Function ==

In [dicot](/source/Dicotyledon) roots, the pericycle strengthens the roots and provides protection for the [vascular bundle](/source/vascular_bundle)s.{{Citation needed|date=August 2023}}

In dicot root, the vascular cambium is completely secondary in origin, and it originates from a portion of pericycle tissue.{{Citation needed|date=August 2023}}

The pericycle regulates the formation of lateral roots by rapidly dividing near the xylem elements of the root.<ref>{{cite journal |pmid=7588064 |url=http://dev.biologists.org/cgi/pmidlookup?view=long&pmid=7588064 |year=1995 |last1=Laskowski |first1=M. J. |title=Formation of lateral root meristems is a two-stage process |journal=Development |volume=121 |issue=10 |pages=3303–10 |last2=Williams |first2=M. E. |last3=Nusbaum |first3=H. C. |last4=Sussex |first4=I. M. | doi=10.1242/dev.121.10.3303 |url-access=subscription }}</ref>

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|date=August 2023}}

Past efforts to isolate such tissue have been successful. [Monocot](/source/Monocotyledon) roots rarely branch, but can, and this branch will originate from the pericycle.{{Citation needed|date=August 2023}}

==References==
{{Reflist}}

Category:Plant morphology

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Adapted from the Wikipedia article [Pericycle](https://en.wikipedia.org/wiki/Pericycle) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Pericycle?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.