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plastid
plastid An organelle within a plant cell, often occurring in large numbers. Apart from the nucleus, plastids are the largest solid inclusions in a plant cell. For convenience they are classified into those containing pigments (chromoplasts) and those that are colourless (leucoplasts), although changes from one to the other frequently occur. Plastids develop from proplastids, colourless bodies found in meristematic and immature cells; they also arise by division of existing plastids. See also chloroplast.
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"plastid." A Dictionary of Biology. 2004. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "plastid." A Dictionary of Biology. 2004. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O6-plastid.html "plastid." A Dictionary of Biology. 2004. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-plastid.html |
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plastid
plastid An organelle that is believed to have evolved from an autotrophic (see AUTOTROPH) endosymbiont early in plant evolution. Plastids occur in a variety of morphologies, including chloroplasts, chromoplasts, and leucoplasts, which are capable of being interchangeable. (Chloroplasts can develop into chromoplasts, and leucoplasts into chloroplasts.)
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MICHAEL ALLABY. "plastid." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "plastid." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O7-plastid.html MICHAEL ALLABY. "plastid." A Dictionary of Plant Sciences. 1998. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-plastid.html |
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plastid
plastid Type of organelle (specialized structure) found in the cells of plants and green algae. Chloroplasts and leucoplasts are two examples of plastids, which have a double membrane and contain DNA.
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"plastid." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "plastid." World Encyclopedia. 2005. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O142-plastid.html "plastid." World Encyclopedia. 2005. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-plastid.html |
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plastid
plas·tid / ˈplastid/ • n. Bot. any of a class of small organelles, such as chloroplasts, in the cytoplasm of plant cells, containing pigment or food. |
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Cite this article
"plastid." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "plastid." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O999-plastid.html "plastid." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-plastid.html |
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