Secondary cell wall

Secondary cell wall

The secondary cell wall is a structure in found in many plant cells, located between the primary cell wall and the plasma membrane. The cell starts producing the secondary cell wall only after the primary cell wall is complete and the cell has stopped growing.Buchanan, Gruissem, Jones, "Biochemistry & molecular biology of plants", 1st edition, American Society of Plant Physiology, 2000]

The secondary cell wall consists mainly of cellulose, but also other polysaccharides, lignin, and proteins. It sometimes consists of three distinct layers - S1, S2 and S3 - where the direction of the cellulose differs between the layers.Buchanan, Gruissem, Jones, "Biochemistry & molecular biology of plants", 1st edition, American Society of Plant Physiology, 2000]

Wood consists mostly of secondary cell wall, and holds the plant up against gravity. [Campbell, Reece, "Biology", 7th edition, Pearson/Benjamin Cummings, 2005]

Some secondary cell walls store nutrient, such as those in the cotyledons and the endosperm. These contain little cellulose, and mostly other polysaccharides.Buchanan, Gruissem, Jones, "Biochemistry & molecular biology of plants", 1st edition, American Society of Plant Physiology, 2000]

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • secondary cell wall — The innermost layer of cell wall, giving rigidity to the cells. Characterized by its highly organized microfibrillar structure, and only formed in certain cells after cell elongation has ceased …   Glossary of Biotechnology

  • Cell wall — A cell wall is a tough, flexible and sometimes fairly rigid layer surrounding a cell, located external to the cell membrane, which provides the cell with structural support, protection, and acts as a filtering mechanism. A major function of the… …   Wikipedia

  • cell wall — Extracellular material serving a structural role. In plants the primary wall is pectin rich, the secondary wall mostly composed of cellulose. In bacteria, cell wall structure is complex: the walls of Gram positive and Gram negative bacteria are… …   Dictionary of molecular biology

  • primary cell wall — A plant cell wall that is still able to expand, permitting cell growth. Growth is normally prevented when a secondary wall has formed. Primary cell walls contain more pectin than secondary walls, and no lignin is present until a secondary wall… …   Dictionary of molecular biology

  • secondary thickening — Deposition of secondary cell wall materials which result in an increase in thickness in stems and roots …   Glossary of Biotechnology

  • secondary oocyte — n an oocyte that is produced by division of a primary oocyte in the first meiotic division * * * an oocyte in the period between the first and second maturation division; it is derived from a primary oocyte shortly before ovulation by a division… …   Medical dictionary

  • cell — cell1 cell like, adj. /sel/, n. 1. a small room, as in a convent or prison. 2. any of various small compartments or bounded areas forming part of a whole. 3. a small group acting as a unit within a larger organization: a local cell of the… …   Universalium

  • secondary wall — (of plants) That part of the plant cell wall which is laid down on top of the primary cell wall after the wall has ceased to increase in surface area. Only occurs in certain cell types, eg. tracheids, vessel elements and sclerenchyma. Differs… …   Dictionary of molecular biology

  • secondary wall — noun : the portion of a plant cell wall formed internal to and subsequent to deposition of the primary wall after the cell has attained its final size and shape usually constituting most of the cell wall, often being very complex and consisting… …   Useful english dictionary

  • Plant cell — Plant cells are eukaryotic cells that differ in several key respects from the cells of other eukaryotic organisms. Their distinctive features include: * A large central vacuole, a sap filled volume enclosed by a membrane known as the tonoplast JA …   Wikipedia

Share the article and excerpts

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