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medullary ray
medullary ray (ray) Any of the vertical plates of parenchyma cells running radially through the cylinder of vascular tissue in the stems and roots of plants. Each may be one to many cells in width. Primary medullary rays occur in young plants and in those not showing secondary thickening; they pass from the cortex through to the pith. Secondary medullary rays are produced by the vascular cambium and terminate in xylem and phloem tissues. Medullary rays store and transport food materials.
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"medullary ray." A Dictionary of Biology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "medullary ray." A Dictionary of Biology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O6-medullaryray.html "medullary ray." A Dictionary of Biology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-medullaryray.html |
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medullary rays
medullary rays A plate of parenchyma that extends between the medulla and the cortex across the vascular region.
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Cite this article
MICHAEL ALLABY. "medullary rays." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "medullary rays." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O7-medullaryrays.html MICHAEL ALLABY. "medullary rays." A Dictionary of Plant Sciences. 1998. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-medullaryrays.html |
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