File:Herbaceous Dicot Root Closed Vascular Bundle in Mature Ranunculus (35613584780).jpg

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cross section: Mature Ranunculus root common name: Buttercup magnification: 400x

<a href="http://blogs.berkshirecc.edu/bccoer" rel="noreferrer nofollow">Berkshire Community College Bioscience Image Library</a>

The cortex is well-developed and divided into two zones; a narrow outer layer of closely packed smaller parenchyma cells (exodermis) and a wide inner layer of larger open aerenchyma cells

The inmost area of the cortex is bounded by an endodermis or starch sheath with larger barrel shaped cells and thickened walls that mark the red staining casparian strip. Within the endodermis occasional small passage cells serve to transport of water into the stele or vascular bundle.

The stele is bound on its outmost edge by is a pericycle of single layered thin walled parenchyma cells.

The closed vascular bundles are arranged radially with arms of exarch xylem interspaced with patches of phloem and parenchymous conjunctive tissue. These tissues may become sclerenchymous in older roots

Vascular cambium is also absent, preventing secondary growth of the root.
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来源 Herbaceous Dicot Root: Closed Vascular Bundle in Mature Ranunculus
作者 Berkshire Community College Bioscience Image Library

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这幅图片原始出处为Flickr的https://flickr.com/photos/146824358@N03/35613584780 ,作者为bccoer 。经机器人FlickreviewR 2在2019年10月5日审查后确定为采用cc-zero的协议授权使用。

2019年10月5日

Files from Berkshire Community College Bioscience Image Library Flickr stream uploaded by Netha Hussain

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