Geiger D R
Department of Biology, University of Dayton, Dayton, Ohio 45409.
Plant Physiol. 1966 Dec;41(10):1667-72. doi: 10.1104/pp.41.10.1667.
The effect of metabolic inhibition of the sink tissues on translocation of (14)C-labeled photosynthate was studied by cooling part or all of the sink region in a translocating sugar beet plant (Beta vulgaris L. var Klein Wanzleben).When the sink region was cooled, 4 phases were observed: a temporary decline, a period of translocation at the pre-treatment rate, a period of decline, and a new steady rate at 35 to 45% of the original rate. The new rate persisted throughout 26 hours of cooling.Cooling half the blade of a developing leaf caused a decline in translocation to the uncooled half. When a portion of the beet was cooled, translocation to a developing leaf located above the supply leaf node increased 30%.Translocation into the treated region recovered rapidly and completely when cooling ceased indicating that cooling had not caused serious damage to tissues. Enhancement of the proportion of (14)C as sucrose in the cooled portion of the sink leaf as compared with the corresponding warm side indicated that sucrose is the chief species of translocate molecule arriving in the sink.The data suggest that the translocation process includes active uptake into storage and growing areas.
通过冷却正在转运光合产物的甜菜植株（Beta vulgaris L. var Klein Wanzleben）的部分或全部库组织，研究了库组织代谢抑制对¹⁴C标记光合产物转运的影响。当库组织冷却时，观察到4个阶段：暂时下降、以处理前速率转运的时期、下降时期以及新的稳定速率，该速率为原始速率的35%至45%。新速率在整个26小时的冷却过程中持续存在。冷却发育中叶片的半叶会导致向未冷却半叶的转运下降。当甜菜的一部分被冷却时，向供应叶节点上方发育中叶片的转运增加了30%。冷却停止后，向处理区域的转运迅速且完全恢复，表明冷却未对组织造成严重损伤。与相应的温暖一侧相比，库叶冷却部分中¹⁴C作为蔗糖的比例增加，表明蔗糖是到达库中的主要转运分子种类。数据表明，转运过程包括主动摄取到储存和生长区域。
