Department of Biochemistry and Biophysics, Iowa State University, Ames, Iowa.
Plant Physiol. 1966 Sep;41(7):1130-4. doi: 10.1104/pp.41.7.1130.
Apetiolar transport of photosynthate (-14)C has been studied by feeding of (14)CO(2) to soybean petioles. Translocation occurs in the absence of leaves, but both the rate and velocity are diminished. The effect of root excision is not as profound as that of leaves. It appears, in some instances, to inhibit transport partially, so that accumulation of photosynthate develops, giving a steeper isotopic gradient. The effect of leaf darkening is to diminish its uptake of photosynthate from the petiole, possibly as a result of decreased transpiration in the lowered temperature of the darkened leaf. The data suggest that neither mass flow nor active transport provide an adequate basis for normal photosynthate transport but that the leaves provide a direct force requiring structural continuity, or a translocation carrier.
通过向大豆叶柄中饲喂 14CO2 来研究同化产物（-14C）的叶柄运输。在没有叶片的情况下会发生转移，但转移的速度和速率都会降低。根切除的影响不如叶片那样明显。它似乎在某些情况下部分抑制了运输，从而导致同化产物的积累，形成更陡峭的同位素梯度。叶片变暗的影响是减少其从叶柄中摄取同化产物，这可能是由于叶片温度降低导致蒸腾作用减少的结果。这些数据表明，无论是质量流还是主动运输都不能为正常的同化产物运输提供充分的基础，而是叶片提供了一种直接的力，需要结构的连续性，或者是一种转运载体。
