Dictionary > Apoplast

Apoplast

Definition
noun, plural: apoplasts
(botany) The space in between the cells, such as that in the root of a plant, creating a pathway through which water and other substances may pass through
(protozoology) A plastid without pigments thereby resulting in a colourless protozoon in a group that is generally coloured
Supplement
In botany, apoplast refers to the space formed in between the cells thereby creating a pathway through which materials may diffuse freely. The apoplast is comprised of non-living components, particularly cell walls and intercellular material. It does not include the protoplast. In root, the flow of materials through the apoplast is interrupted by the Casparian strip. The Casparian strip is a band of cell wall material (chiefly, suberin) on the radial and transverse walls of the endodermal cells of root. Suberin is a lipophilic biopolymer that acts as a protective barrier against excessive water loss. Because of the suberin in the Casparian strip, the passive flow of materials, e.g. water and solutes, into the stele is prevented. Water and nutrients absorbed by the roots are blocked from entering the stele via the apoplastic pathway. As a result, solutes flow via the symplastic pathway. This is important so that there would be selective passage of solutes, especially when they might bring harm to the plant.
In protozoology, an apoplast is the plastid lacking pigments as opposed to chromatophores with pigments. Thus, the lack of pigments in an apoplast leads to a colourless protozoon in a group that is generally coloured.
Compare:

  • symplast (botany)

See also:

  • Casparian strip (botany)
  • Related term(s):

    Related form(s):

  • apoplastic (adjective, of, pertaining to, or relating to apoplast, or apolasty)


    You will also like...

    Mātauranga Māori and Science Collaboration
    Mātauranga Māori and Science

    Mātauranga Māori is the living knowledge system of the indigenous people of New Zealand, including the relationships t..

    Crossing Over and Genetic Diversity
    Inheritance and Probability

    Gregor Mendel, an Austrian monk, is most famous in this field for his study of the phenotype of pea plants, including ..

    New Zealand Fauna
    New Zealand’s Unique Fauna

    Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..

    Nephrolepis exaltata
    Vascular Plants: Ferns and Relatives

    Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

    primitive arthropods
    Arthropods

    The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

    Adaptation Tutorial
    Adaptation Tutorial

    Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..