Bedford College, Regent's Park, NW1 4NS, London, U. K..
Planta. 1973 Jun;110(2):145-52. doi: 10.1007/BF00384836.
The characteristics of (137)Cs transport along the stolon of Saxifraga previously reported have been confirmed for applied sucrose and natural assimilate. Long-distance transport is strictly unidirectional, with a symmetrical short-distance spread from the point of application. Only the latter takes place in a long piece of excised stolon. Transport is readily reversed when the parent plant is darkened and the daugther, plantlet allowed to photosynthesise. These findings strongly support a mass-flow mechanism for the stolon. They also confirm the value of (137)Cs as a tracer for assimilate movement, though in contrast to assimilate it suffers appreciable lateral leakage. Pulse labelling of the subtending leaf failed to produce a sharp peak of activity in the stolon. A flattening with time of the (14)C profile is considered to be due to differing linear velocities in parallel sieve tubes.
先前已证实，沿匍匐茎运输137Cs 的特征适用于施加的蔗糖和天然同化物。长距离运输是严格单向的，从施加点对称地短距离扩散。只有后者发生在一条长的切段匍匐茎上。当母体植物变黑暗而子体、小植株被允许光合作用时，运输很容易被逆转。这些发现强烈支持匍匐茎的质量流机制。它们还证实了137Cs 作为同化物运动示踪剂的价值，尽管与同化物相比，它会遭受明显的侧向渗漏。对下延叶进行脉冲标记未能在匍匐茎中产生活性的明显峰值。14C 谱随时间的扁平化被认为是由于平行筛管中不同的线性速度所致。
