Pericycle

Source: Wikipedia, the free encyclopedia.

The pericycle is a cylinder of

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

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