The mechanical role of the endodermis in Equisetum plant stems.
The mechanical role of the endodermis in Equisetum plant stems.
复制标题
木贼植物茎内皮层的机械作用。
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Emanns
中科院分区：
文献类型：
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作者：
H. Spatz;A. Emanns
木贼属不同种的内皮层有不同的结构，有两层或一层连续的内皮层，也有一层仅包围维管束的鞘。内皮层是否有助于气生枝的机械稳定性的问题，从两个方面进行了研究：在一个直接的方法中，E。纵向解剖hyemale，并测量抗椭圆化的机械稳定性，作为切口相对于所施加力的方向的函数。一种比较方法测试了八种不同种类的木贼对样品横截面椭圆化的机械稳定性，这些样品是完全膨胀的或具有降低的膨压。双层内皮层对E. affinis和E. hyemale。Equisetum arvense、欧洲木贼E. pratense、E. sylvaticum和E. Telmateja至少在低膨压条件下通过其单层内皮层机械稳定。
The endodermis of different species of the genus Equisetum has different configurations, two or one continuous layers or a sheath only around the vascular bundles. The question whether the endodermis contributes to the mechanical stability of the aerial shoots is investigated in two ways: In a direct approach, the endodermis of segments of E. hyemale was dissected longitudinally and the mechanical stability against ovalization measured as a function of the orientation of the cuts with respect to the forces applied. A comparative approach tested the mechanical stability of eight different species of Equisetum against ovalization of the cross-section for samples, which were either fully turgescent or had reduced turgor pressure. The double-layer endodermis substantially contributed to the mechanical stability of E. affinis and E. hyemale. Equisetum arvense, E. pratense, E. sylvaticum, and E. telmateja are mechanically stabilized by their single layer of endodermis at least under conditions of low turgor pressure.