THE TOLERANCE OF TREE ROOTS TO WATERLOGGING. III. OXYGEN TRANSPORT IN LODGEPOLE PINE AND SITKA SPRUCE ROOTS OF PRIMARY STRUCTURE
THE TOLERANCE OF TREE ROOTS TO WATERLOGGING. III. OXYGEN TRANSPORT IN LODGEPOLE PINE AND SITKA SPRUCE ROOTS OF PRIMARY STRUCTURE
复制标题
树根对水涝的耐受性。
DOI：
10.1111/j.1469-8137.1978.tb01567.x
复制
发表时间：
1978
期刊：
影响因子：
9.4
通讯作者：
M. Coutts
中科院分区：
文献类型：
--
作者：
J. Philipson;M. Coutts
将幼苗根系或插条的单个根浸没在还原靛蓝胭脂红溶液中，使得仅幼苗枝条或插条根的基部暴露于空气或氧气。氧气从根部扩散出来，使之前透明的还原染料呈现出局部蓝色;这一过程被用来研究内部氧气的运动。使用生长在自由排水土壤中的植物，可以明显看出耐洪水的松（Lodgepole pine）的幼苗比不耐洪水的锡特卡云杉（Sitka spruce）具有更大的氧气运输能力。氧扩散也观察到在根分离的小杆松插条，并大大提高了在植物中生长在淹水条件下，在后者的植物氧扩散检测到从根尖后，短期暴露的基础区域的根的氧气，而根生长在自由排水的土壤中的植物表现出扩散的氧气只从上部淹没的部分在同一治疗期间。在某些实验中，氧的扩散距离超过30厘米。对在压力下供应给黑松根段的气体运动的观察表明，在淹水土壤中生长的根中的气体流动速率比在自由排水土壤中生长的根中的气体流动速率大得多，并且气体运动发生在中柱组织中。氧气进入的区域包括针叶和根部的气孔。
Seedling root systems, or individual roots of cuttings, were submerged in reduced indigo‐carmine solution so that only the seedling shoot, or basal part of the cutting root, was exposed to air or oxygen. Oxygen diffusing out of the roots produced a localized blue colouration of the previously clear reduced dye; this process was employed to study internal oxygen movement.Using plants grown in freely drained soil it was evident that seedlings of the flood‐tolerant species, Lodgepole pine, had a greater capacity for oxygen transport than the flood‐intolerant Sitka spruce. Oxygen diffusion was also observed in roots detached from Lodgepole pine cuttings and was greatly enhanced in plants which had grown in waterlogged conditions; in the latter plants oxygen diffusion was detected from the root tips after a short exposure of the basal region of the root to oxygen, whereas roots from plants grown in freely drained soil showed diffusion of oxygen only from the upper submerged portion during the same treatment period. Oxygen diffusion over distances of more than 30 cm was detected in certain experiments.Observations on the movement of gas supplied under pressure to Lodgepole pine root segments showed that the rate of gas flow was much greater in roots grown in waterlogged soil than in those grown in freely drained soil and that the gas movement occurred in the stelar tissues. The regions of oxygen entry included the needles, and lenticels on the roots.