Title: Study on anatomy of the stem of Cycas segmentifida
Abstract: The anatomical structure of stem of Cycas segmentifida were studied.The results show that stem of C.segmentifida possesses of abundant cortex and there are mucilage canals distribute in cortex and pith.Collateral vascular bundle and amphicribral vascular bundle also distribute in cortex,but the most one is collateral vascular bundle.Three kinds of different trends vascular bundle-horizontal,vertical and slanting can be seen in the identical section.Phloem component of all vascular bundle in cortex are singleness.The vascular tissue consists of some growth rings,every growth ring is composed of outer phloem,middle cambium and inner xylem;in every growth ring,the ratio of phloem is more than xylem in vascular tissue.There are four growth rings in vascular tissue of bottom stem and there are 2-10 layers parenchyma cells between the two growth rings.Viewing from vertical variation,the thickness and the number of rings of vascular tissue is increasing from top to bottom.In the same tissue,from top to bottom,distribution trend of crystalliferous parenchyma cells and tannin parenchyma cells are from absence to presence and from few to many.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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