Minchin P E, Thorpe M R
Horticultural and Food Research Institute of New Zealand Limited, PO Box 31-313, Lower Hutt, New Zealand.
J Exp Bot. 1996 Aug;47 Spec No:1293-6. doi: 10.1093/jxb/47.Special_Issue.1293.
Carbohydrate sinks have been described by their ability to attract photosynthate, denoted by sink strength, and by their priority rank ordering for supply in the presence of a reduced availability of photosynthate. Sink strength has been defined as the rate of carbohydrate flow into a sink, but this flow rate is also dependent upon supply, other sinks, and resistance to flow of the transport pathway, so it is not a property of the sink alone. It is a property of the entire system. Hence sink strength defined as a flow rate is not a valid descriptor of a sink. However, a simple model of phloem flow based upon Münch's ideas and with saturable unloading has many properties similar to a plant's carbohydrate source-sink relations, including priorities of sinks, and leads to a set of sink descriptors. This model's ability to mimic observed source-sink relations is reviewed here.
碳水化合物库已根据其吸引光合产物的能力（用库强度表示）以及在光合产物供应减少时其供应的优先等级顺序来描述。库强度被定义为碳水化合物流入库的速率，但该流速还取决于供应、其他库以及运输途径的流动阻力，因此它并非仅为库的特性。它是整个系统的特性。因此，将库强度定义为流速并非对库的有效描述。然而，一个基于明希理论且具有饱和卸载的简单韧皮部流动模型具有许多与植物碳水化合物源 - 库关系相似的特性，包括库的优先级，并得出了一组库描述符。本文将对该模型模拟观察到的源 - 库关系的能力进行综述。
