HORIZONTAL STRUCTURES ON PNEUMATOPHORES OF AVICENNIA-MARINA (FORSK) VIERH - A NEW SITE OF OXYGEN CONDUCTANCE
HORIZONTAL STRUCTURES ON PNEUMATOPHORES OF AVICENNIA-MARINA (FORSK) VIERH - A NEW SITE OF OXYGEN CONDUCTANCE
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DOI：
10.1006/anbo.1994.1047
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发表时间：
1994-04-01
期刊：
影响因子：
4.2
通讯作者：
ALLAWAY, WG
中科院分区：
文献类型：
--
作者：
HOVENDEN, MJ;ALLAWAY, WG
灰色红树林，白骨壤，pneumatophores的氧气的电导率取决于pneumatophores的功能pneumatophores的数量高达约25，并可能在pneumatophores的气体空间的横截面积超过25。由于电导中存在大量的非细胞成分，因此对细胞数的依赖性远非完美。这种非细胞传导性归因于最近形成的一部分的pneumatophore的“水平结构”。这些被认为是由于根冠的持久部分仍然附着在气托的表面上，并且在其周围，周壁表面的破裂发展。在淹没之后，电池干燥并且在大约三分钟内恢复完全导电。水平结构的非细胞电导率在水淹后需要大约十倍的时间才能恢复。然而，这些水平结构很可能代表了一个重要的途径，特别是在快速增长的根，其中尖端区域缺乏气孔。建议将这些水平结构命名为“subrisules”。版权所有1994，1999学术出版社
Conductance of pneumatophores of the grey mangrove,Avicennia marina, to oxygen depended on lenticel number up to about 25 functional lenticels per pneumatophore, and probably on cross-sectional area of the gas space in pneumatophores with over 25. The dependence on lenticel number was far from perfect, because of a substantial non-lenticellular component of conductance. This non-lenticellular conductance was attributed to 'horizontal structures' on the most recently formed part of the pneumatophore. These were thought to result from persistent portions of the root cap which remained attached to the surface of the pneumatophore, and around which breaks in the surface of the periderm developed. Following flooding, the lenticels dried and resumed full conductance within about three minutes. Non-lenticellular conductance imputed to the horizontal structures took about ten times as long to recover after flooding. Nevertheless, these horizontal structures are likely to represent a significant pathway for admission of oxygen, especially in rapidly growing roots where the tip region lacks lenticels. A name, 'subrisules', for these horizontal structures is proposed.Copyright 1994, 1999 Academic Press