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首页> 外文期刊>International journal of plant sciences >ASPECTS OF VESSEL DIMENSIONS IN THE AERIAL ROOTS OF EPIPHYTIC ARACEAE
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ASPECTS OF VESSEL DIMENSIONS IN THE AERIAL ROOTS OF EPIPHYTIC ARACEAE

机译：陆生科动物空中根部的血管大小方面

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摘要

We measured vessel dimensions, most significantly vessel length, in the aerial roots of four epiphytic aroids using a digital camera to photograph sequential sections. Pendulous aerial roots in Araceae can grow from the forest canopy and so reach considerable length (>30 m) before they contact the ground, branch, and become anchored. In the free-hanging state, the length over which tissue maturation occurs can exceed 1 m. We show that the distinctive medullary vessels do not anastomose and each series of vessels, end to end here termed a "pipe," must differentiate without interruption throughout the length of the root and do not become fully functional until the ground is reached. Measurements show different vessel parameters, including vessel overlap at each vessel end, which is not usually considered in estimates of hydraulic conductivity. Our method of measurement is simple and direct and shows the topographic relation of all vessels in a single organ, suggesting that vessels in long plant organs can be measured precisely, giving results of value in considering the hydraulic properties of xylem elements.
机译：我们使用数码相机拍摄了连续的切片，测量了四个附生的无齿类的气生根的脉管尺寸，最重要的是脉管长度。天南星科的悬生气生根可以从林冠生长，因此在接触地面，分支并锚定之前达到相当长的长度（> 30 m）。在自由悬挂状态下，组织成熟发生的长度可以超过1 m。我们证明了独特的延髓血管不会吻合，端到端称为“管道”的每系列血管都必须在整个根部长度范围内无间断地分化，并且直到到达地面后才能完全发挥作用。测量结果显示了不同的容器参数，包括每个容器端部的容器重叠，这在水力传导率的估算中通常不考虑。我们的测量方法简单而直接，并且显示了单个器官中所有容器的地形关系，这表明可以精确地测量较长的植物器官中的容器，从而在考虑木质部元素的水力特性方面提供了有价值的结果。

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  • 来源
    《International journal of plant sciences》 |2010年第4期|P.362-369|共8页
  • 作者

    Brett Huggett; P. Barry Tomlinson;

  • 作者单位

    Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138, U.S.A.;

    rnThe Kampong, National Tropical Botanical Garden, 4013 Douglas Road, Miami, Florida 33133, U.S.A. Harvard Forest, Harvard University, 324 North Main Street, Petersham, Massachusetts 01366, U.S.A.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    aerial roots; Araceae; pipes; stelar anatomy; vessel dimension; xylem;

    机译：气生根天南星科;管道;硬骨解剖容器尺寸木质部;
  • 入库时间 2022-08-18 03:45:40

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