测定了温州蜜柑 (CitrusunshiuMarc .cv .Miyagawawase)果实发育进程中干鲜重、果皮光合速率和叶绿素含量的变化 ,并用14 CO2 示踪技术研究了果皮和叶同化生成的光合产物在果实内的运输分配特性。结果表明 :果皮光合速率与叶绿素含量有关 ,随着叶绿素含量的下降 ,果实光合速率也快速下降。在果实完熟之前 ,即使是当果皮积累的干重超过汁囊时 ,叶同化产物仍主要分配到汁囊中 ;而在完熟阶段 ,果皮光合速率接近零 ,果皮成了叶同化产物的主要库。果皮的同化产物 ,主要保留在果皮中 ,输入到汁囊的比率随果实发育而下降 ,但高峰时也有 12 %输入汁囊。与对照相比 ,果实遮光处理后降低了果皮与汁囊的干重和含糖量。上述结果表明果皮光合产物主要用于果皮自身的发育并能减少对叶光合产物的依赖 ,同时也能部分增加汁囊糖的积累 The changes of fresh weight, photosynthetic rate and chlorophyll content during the fruit development of Citrus unshiuMarc. Cv. Miyagawawase were determined. The 14 CO 2 tracing technique was used to study the transport and distribution of photosynthate in fruits during the fruit and leaf assimilation process characteristic. The results showed that: the pericarp photosynthetic rate and chlorophyll content, with the chlorophyll content decreased, fruit photosynthetic rate also decreased rapidly. Before fruit ripening, the leaf assimilate was still mainly distributed in the juice sac, even when the dry weight of the peel accumulated more than the juice sac. In the ripening stage, the photosynthetic rate of the peel was close to zero, and the peel became the main pool of leaf assimilate. The pericarp assimilation product, mainly in the peel, entered the juice sac ratio decreased with fruit development, but at the peak of 12% input juice sac. Compared with the control, the shading of fruits reduced the dry weight and sugar content of peel and juice sac. The above results indicate that the pericarp photosynthate is mainly used for the pericarp’s own development and can reduce the dependence on leaf photosynthetic products, but also can partially increase the accumulation of saccharomyces cerevisiae