The root endodermis: fine structure and function.
The root endodermis: fine structure and function.
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DOI：
10.1083/jcb.37.1.199
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发表时间：
1968-04
期刊：
影响因子：
--
通讯作者：
Bonnett HT Jr
中科院分区：
文献类型：
--
作者：
Bonnett HT Jr
根内皮层的拓扑结构，周围的薄壁细胞和中央传导细胞包围的组织，表明它具有调节作用的水，矿物质和激素的径向运动。每个内胚层细胞的特征在于沿径向和横向壁沿着延伸的窄带;该带，称为凯氏带，通过木栓质和木质素特异性染色与壁的其余部分在化学上可区分。Suberin是一种脂质物质，它使这部分细胞壁具有疏水性，从而阻止水和水溶性溶质通过。每一条带都由相邻的内胚层细胞共享，因此栓化细胞壁的网络围绕着根的传导区域。在该网络处或之前，水和水溶性溶质（如水合离子）必须从皮层薄壁组织的细胞间隙系统移动到内胚层细胞的细胞质中，以到达根的中心。尽管对水、矿物质和激素的摄取和运动进行了广泛的研究，但内皮层在运输中的具体作用尚未确定。
The topology of the root endodermis, a tissue surrounded by peripherally located parenchyma cells and central conducting cells, suggests that it has a regulatory role in radial movement of water, minerals, and hormones. Each endodermal cell is characterized by a narrow band extending along the radial and transverse walls; this band, termed the Casparian strip, is chemically distinguishable from the remainder of the wall by stains specific for suberin and lignin. Suberin, a lipid substance, causes this portion of the wall to be hydrophobic and thus prevents passage of water and aqueous solutes. Each band is shared by the adjacent endodermal cells so that a network of suberized cell wall surrounds the conducting region of the root. At or before this network, water and aqueous solutes (such as hydrated ions) must move from the intercellular space system of the cortical parenchyma into the cytoplasm of the endodermal cell, in order to reach the center of the root. Despite extensive research on uptake and movement of water, minerals, and hormones, the specific role of the endodermis in transport is not defined.