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  2. Hydathode - Wikipedia

    en.wikipedia.org/wiki/Hydathode

    A hydathode is a type of pore, commonly found in vascular plants, [1] that secretes water through pores in the epidermis or leaf margin, typically at the tip of a marginal tooth or serration. Hydathodes occur in the leaves of submerged aquatic plants such as Ranunculus fluitans [ 2 ] as well as herbaceous plants of drier habitats such as ...

  3. Lenticel - Wikipedia

    en.wikipedia.org/wiki/Lenticel

    A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of gymnosperms and dicotyledonous flowering plants. [2] It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and ...

  4. Stoma - Wikipedia

    en.wikipedia.org/wiki/Stoma

    The existence of a feedback mechanism results a phenotypic plasticity in response to [CO 2] atm that may have been an adaptive trait in the evolution of plant respiration and function. [30] [35] Predicting how stomata perform during adaptation is useful for understanding the productivity of plant systems for both natural and agricultural ...

  5. Aquaporin - Wikipedia

    en.wikipedia.org/wiki/Aquaporin

    The gating of an aquaporin is carried out by an interaction between a gating mechanism and the aquaporin, which causes a 3D change in the protein so that it blocks the pore and, thus, disallows the flow of water through the pore. In plants, there are at least two forms of aquaporin gating: gating by the dephosphorylation of certain serine ...

  6. Tracheid - Wikipedia

    en.wikipedia.org/wiki/Tracheid

    The fossil record shows three different types of tracheid cells found in early plants, which were classified as S-type, G-type and P-type. The first two of them were lignified and had pores to facilitate the transportation of water between cells. The P-type tracheid cells had pits similar to extant plant tracheids.

  7. Guard cell - Wikipedia

    en.wikipedia.org/wiki/Guard_cell

    Water stress (drought and salt stress) is one of the major environmental problems causing severe losses in agriculture and in nature. Drought tolerance of plants is mediated by several mechanisms that work together, including stabilizing and protecting the plant from damage caused by desiccation and also controlling how much water plants lose through the stomatal pores during drought.

  8. Sieve tube element - Wikipedia

    en.wikipedia.org/wiki/Sieve_tube_element

    Their narrow pores are necessary in their function in most seedless vascular plants and gymnosperms which lack sieve-tube members and only have sieve cells to transport molecules. [1] While sieve cells have smaller sieve areas, they are still distributed across several cells to still effectively transport material to various tissue within the ...

  9. Marchantia - Wikipedia

    en.wikipedia.org/wiki/Marchantia

    Marchantia is a genus of liverworts in the family Marchantiaceae and the order Marchantiales.The genus was named by French botanist Jean Marchant after his father.. The thallus of Marchantia shows differentiation into two layers: an upper photosynthetic layer with a well-defined upper epidermis with pores and a lower storage layer.