Periderm Notes: Definitions & Explanations PDF | Download eBooks
Study Periderm lecture notes PDF with biology definitions and explanation to study What is Periderm?. Study periderm explanation with biology terms to review biology course for online degree programs.
Periderm Definition:
In woody plants, protective tissues called periderm replace the epidermis in older regions of stems and roots.
Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson
Periderm Notes:
Periderm is a secondary protective covering that forms on small woody stems and many non-woody plants, which is composed of cork (phellem), the cork cambium (phellogen), and the phelloderm. The periderm forms from the phellogen which serves as a lateral meristem. The periderm replaces the epidermis, and acts as a protective covering like the epidermis. Mature phellem cells have suberin in their walls to protect the stem from desiccation and pathogen attack. Older phellem cells are dead, as is the case with woody stems. The skin on the potato tuber (which is an underground stem) constitutes the cork of the periderm.
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