中文摘要：

以夜温15℃为对照，研究了9℃长期夜间亚低温对开花后20d的番茄生长发育与光合产物分配的影响。结果表明：长期夜间亚低温处理使番茄的总干物质质量降低，果文的发育速度减慢，平均单株产最降低（降幅为28．24％）；番茄光合产物的分配方向发生了改变，即：夜低温处理使根中的干物质分配比率前期减少而后期增加，叶、茎的干物质分配比率增加（平均增加量分别为17．65％、15．71％），果实的干物质分配比率降低（平均减少量为24.39％）。

英文摘要：

Effects of long-term sub-low night temperature （9℃ and 15℃ as control） on the growth and development and dry matter distribution in tomato after 20 days anthesis were studied. The results indicated that dry matter weight of tomatoes lowered under long-term sub-low night temperature,the growth rate of fruits and average yield per plant decreased （the rate of decrease was 28%）,The distributive direction of photosynthate of tomatoes was altered. The distributive ratio of dry matter in roots decreased in the earlier stage under low night temperature while increased in the later stage, and the distributive ratio of dry matter in leaves and stems increased （the average rates of increase were 17465% and 15.71% respectively）. Then the distributive ratio of dry matter in fruits decreased （the average rate of decrease was 24.39%）.