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Topic: Secondary xylem


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In the News (Thu 17 Dec 09)

  
  Root Article, Root Information   (Site not responding. Last check: 2007-11-01)
In woody plants, the vascular cambium, originating between the xylem and the phloem, forms a cylinder of tissue along the stem and root.
As secondary xylem accumulates, the "girth" (lateral dimensions) of the stem androot increases.
In monocotyledons,the xylem and phloem cells are located in acircle around the pith, or center of a monocot root's stele, whereas in dicotyledons, the xylem cells form a central "hub" with lobes, and the phloem cellsfill in the space between the lobes.
www.anoca.org /cells/secondary/root.html   (613 words)

  
 Plant Structure II
Dicot roots have their xylem in the center of the root and phloem outside the xylem.
Secondary xylem is produced to the inside of the vascular cambium, secondary phloem to the outside.
Monocot secondary growth differs from dicot secondary growth in that new bundles are formed at the edge of the stem.
www.estrellamountain.edu /faculty/farabee/BIOBK/BioBookPLANTANATII.html   (929 words)

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