Dictionary > Phelloderm

Phelloderm

Definition
noun, plural: phelloderms
(botany) A part of the periderm made up of cells produced inwardly by the cork cambium
Supplement
In woody plants, the epidermis is eventually replaced by a tougher, protective layer called bark. The bark becomes the outermost layer of these plants, protecting them from water loss, mechanical injuries and pathogens. It is made up of the periderm, the cortex, and the phloem. The periderm, in turn, is comprised of the outermost layer, cork (also called phellem), the middle layer, cork cambium (also referred to as the phellogen), and the inner layer, phelloderm. The cork cambium divides mitotically to give rise to new cells that form the cork layer and the phelloderm layer. The new cells produced inwardly are the cells that form the phelloderm whereas those outwardly form the cork. In angiosperms, the cells of the phelloderm are thin walled (parenchymatous). They are not suberized as opposed to cork cells that are impregnated with suberin. Also, the phelloderm cells are living even at functional maturity (not like the cork cells that turn into non-living cells). Depending on the plant species, the phelloderm may be a single layer or multilayer of cells. Some references regard the phelloderm as the secondary cortex in certain plants.
Synonym(s):

  • secondary cortex

See also:

  • cork cambium
  • bark (botany)
  • cortex (botany)


  • You will also like...

    Growth and Plant Hormones
    Growth and Plant Hormones

    Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

    Disturbance on a still water
    Abiotic Factors – Water Conditions

    A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..

    Homo Species
    The Homo Species

    The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

    Ploidy
    Mutation Frequency and Polyploidy

    Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howev..

    Salmon jumping upstream in the river
    Lotic Communities & Animals

    A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

    Young plant growing from the soil.
    Soils

    Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..