为探明外源GA3 对枣树1 4 C -光合产物向果实分配的影响 ,应用1 4 C示踪技术 ,就GA3 的作用机理进行了研究。结果表明 :枣果实发育期施用外源GA3 ,施用GA3 的方法不同 ,其效果亦不相同。赞皇大枣多年生二次枝喷 5 0mg LGA3 后 ,标记叶片光合产物输出量较对照增加 5 6 4% ,花 (果实 )获得的1 4 C ,光合产物量增加了 4 48% ;GA3 涂抹冬枣果实 ,可提高果实的库活性 ,其中 5 0mg LGA3 涂果效果明显好于 2 0mg LGA3 涂果 ;5 0mg LGA3 涂抹冬枣果实同节位叶片 ,可阻止该叶片的1 4 C -光合产物外运 ,果实获得的光合产物减少 In order to explore the effect of exogenous GA3 on the distribution of 14 C - photosynthate in jujube tree, the mechanism of GA3 was studied by using 14 C tracer technique. The results showed that: the application of exogenous GA3 jujube fruit development stage, the application of GA3 different methods, the effect is not the same. Zanhuang jujube perennial secondary shoot spray 50mg LGA3, the marked leaf photosynthetic product output increased 56.4% compared with the control, flower (fruit) obtained 14C, photosynthetic products increased by 48%; GA3 daubed jujube Fruit, can increase the activity of the fruit of the library, of which 50mg LGA3 coating effect was significantly better than 20mg LGA3 coated fruit; 50mg LGA3 coated jujube fruit with the same leaf, can prevent the leaves of 1 4 C - photosynthate transport, The fruit gets less photosynthate