Department of Biochemistry and Biophysics, Iowa State University, Ames, Iowa.
Plant Physiol. 1970 Feb;45(2):119-25. doi: 10.1104/pp.45.2.119.
Based largely on data from soybean, some mathematical models are derived to describe the transport kinetics of (14)C-photosynthate. The effects of leaf size, leaf shape, and translocation velocity on the rate of tracer efflux from the leaf are considered, and it is shown that the duration of these effects will approximate the time required for tracer to reach the petiole from the farthest point of the leaf. This duration is designated as the "kinetic size" of the leaf. Although its effect will be slight in the case of soybean (about 2 to 3 minutes), a considerable effect of the kinetic size will be found in the case of large leaves, or when the translocation velocity is low.Source pool kinetics in soybean are described by a two-compartment model, one compartment representing a photosynthetic compartment and the second (the source pool) a nonphotosynthetic compartment next to the veins. The kinetics in the petiole are approximated by a two-compartment model representing the translocation stream and tissues outside the translocation stream. A combination of the models predicts fairly accurately the translocation kinetics observed in soybean.The models are compared with others in the literature. Although the assumptions are in substantial agreement with those made by Evans, Ebert, and Moorby, they are inconsistent with the model based on the movement of transcellular strands presented by Canny and Phillips.
基于大豆的大量数据，得出了一些数学模型来描述 (14)C-光合产物的运输动力学。考虑了叶片大小、形状和转运速度对示踪剂从叶片中流出速率的影响，结果表明这些影响的持续时间大约相当于示踪剂从叶片最远点到达叶柄所需的时间。这个持续时间被指定为叶片的“运动大小”。尽管在大豆的情况下（约 2 到 3 分钟）这种影响很小，但在大叶片或转运速度较低的情况下，会发现运动大小的相当大的影响。大豆的源库动力学由一个两室模型描述，一个室代表光合室，第二个室（源库）代表靠近叶脉的非光合室。叶柄中的动力学通过一个代表转运流和转运流外组织的两室模型来近似。模型的组合可以相当准确地预测在大豆中观察到的转运动力学。这些模型与文献中的其他模型进行了比较。尽管假设与 Evans、Ebert 和 Moorby 的假设基本一致，但与 Canny 和 Phillips 提出的基于细胞间链运动的模型不一致。
