Palisade cell

Palisade cell

--Palisade cells are a type of leaf tissues and can be found within the mesophyll in leaves of dicotyledonous plants. They contain chloroplasts, which convert the energy stored in photons to chemical energy through photosynthesis.

Palisade cells show various adaptations: first, their cylindrical shape, which allows maximum absorption of light by chloroplasts. Second, these cells produce carbohydrates in greater quantities than are needed by each cell; these carbohydrates are fed into a wide variety of metabolic pathways and are vital to the functioning of the plant. Third, the palisade mesophyll contains the largest number of chloroplasts per cell in the plant; usually positioned towards the upper surface of the leaf in order to harness the greatest amount of energy possible.

Palisade cells are placed all over the top of a leaf, maximising the extent of light absorption. As a result, the top of a leaf is often darker than the bottom.

Palisade cells are grouped together to give the palisade layer of the leaf- this is the leaf tissue where most of the photosynthesis takes place.

Light absorption and photosynthesis is carried out by the chlorophyll chloroplasts, and it is these that give leaves a green pigment. The cell wall helps the cell keep its shape, and the membrane lets certain substances in and out while being permeable to water. All the deoxyrybonucleic acic (DNA) and genetic information of the cell is stored in the nucleus. It is the 'brain' or control centre of the cell, and (in simple terms) tells the cell what to do. In the cytoplasm chemical reactions take place, including the breaking down of glycogen, the cell's food.


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • palisade cell — noun : a cell of palisade parenchyma * * * palisade cell, any one of the long, slender cells with many chloroplasts that lie just beneath the epidermis of leaves. Palisade cells are useful in making food for the plant …   Useful english dictionary

  • palisade cell — noun Date: 1875 a cell of the palisade layer …   New Collegiate Dictionary

  • Cell type — A cell type is a distinct morphological or functional form of cell. When a cell switches state from one cell type to another, it undergoes cellular differentiation.AnimalsHumansDifferent cell types react differently to external stimuli. For… …   Wikipedia

  • palisade — In pathology, a row of elongated nuclei parallel to each other. [Fr. palissade, fr. L. palus, a pale, stake] * * * pal·i·sade (pal″ĭ sādґ) [Fr. palissade, from L. palus stake] the arrangement of cells or cellular structures side… …   Medical dictionary

  • malpighian cell — noun Usage: usually capitalized M : palisade cell …   Useful english dictionary

  • Basal cell carcinoma — Infobox Disease Name = Basal cell carcinoma Caption = DiseasesDB = 1264 ICD10 = ICD9 = ICD9|173 ICDO = 8090/3 8093/3 OMIM = 605462 MedlinePlus = eMedicineSubj = med eMedicineTopic = 214 MeshID = D002280 Basal cell carcinoma is a type of skin… …   Wikipedia

  • collecting cell — noun : one of the spongy parenchyma cells having dilated ends and underlying the palisade cells of leaves and reputedly conveying the products of photosynthesis from the palisade cells to the vascular system of the plant …   Useful english dictionary

  • spongy cell — spongy cell, any one of the loosely packed, irregularly shaped cells lying below the palisade cells in a leaf. Spongy cells use light energy to split water molecules into the hydrogen and oxygen necessary for photosynthesis …   Useful english dictionary

  • palisadecell — palisade cell n. One of the columnar cells of palisade parenchyma. * * * …   Universalium

  • Palisades — or Palisade may refer to:* Palisade, a type of fence * Palisade cell, found in plant leaves * Palisades Toys, a company that produced action figures and other collectiblesPlaces* Palisade State Park, UtahGeology* New Jersey Palisades, cliffs… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”