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Home > Science > What is the Difference Between Glandular and Non-glandular Trichomes?

Guilherme Mazui

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What is the Difference Between Glandular and Non-glandular Trichomes?

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The main difference between glandular and non-glandular trichomes lies in their structure and function. Trichomes are epidermal outgrowths on plant stems and branches that provide protection against various stressors, such as UV light, insects, transpiration, and freeze intolerance. There are two types of trichomes: glandular and non-glandular.

Glandular Trichomes:

  • Possess a glandular head that secretes secondary metabolites.
  • Play important roles in pollination, defense, and protection.
  • Found in approximately 30% of all vascular plants.
  • Can be unicellular or multicellular, consisting of differentiated basal, stalk, and apical cells.

Non-glandular Trichomes:

  • Lack a glandular head.
  • Provide physical protection against biotic and abiotic stressors.
  • Present on most angiosperms, as well as some gymnosperms and bryophytes.
  • Can be unicellular or multicellular, with a thin apex.

In summary, glandular trichomes secrete secondary metabolites for various functions, while non-glandular trichomes provide physical protection to plants against various stressors.

On this page
  • What is the Difference Between Glandular and Non-glandular Trichomes?
  • Comparative Table: Glandular vs Non-glandular Trichomes

    • Comparative Table: Glandular vs Non-glandular Trichomes

    Feature Glandular Trichomes Non-glandular Trichomes
    Definition Glandular trichomes possess a glandular head and secrete secondary metabolites. Non-glandular trichomes do not have a glandular head and play a role in physical protection against biotic and abiotic stresses.
    Secretion Secrete secondary metabolites, such as terpenoids and phenolics. Do not secrete biologically active compounds.
    Structure Usually multicellular and branched, with unicellular trichomes possible on the upper epidermis. Can be branched or unicellular.
    Location Found above the epidermis. Found below the epidermis, providing protection against UV light, insects, transpiration, and freeze intolerance.
    Function Involved in the production, storage, and liberation of biologically active chemical compounds. Mainly involved in physical protection against external factors, such as animals, pathogens, and environmental stresses.
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    Guilherme Mazui

    Guilherme Mazui is graduated in journalism from the Federal University of Minas Gerais (UFMG) and a master's degree in Communication from the University of São Paulo (USP). In addition, he has experience in advertising writing and has worked as a content editor in several companies.