【摘要】 研究了完熟采收对宫川温州蜜柑果实精积累影响和光合产物在果实内的分配特性及运输机制。结果表明:完熟采收可使柑橘汁囊中葡萄糖、果糖、蔗糖含量明显提高。光合产物主要通过背维管束输入汁囊,完熟采收期间分配到汁囊的光合产物占整个果实18%,而分配到可食组织（维管束+囊瓣皮+汁囊）的光合产物却超过60%。从着色期到完熟采收期,维管束到囊瓣皮再到汁囊存在一个由高到低的¹⁴C光合产物的放射性比活度梯度,其中从囊瓣皮到汁囊的梯度都随汁囊糖积累而稳步上升。上述结果表明完熟采收有利于提高果实含糖量,光合产物通过存在于运输路径中由高到低的光合产物梯度推动而持续输入汁囊是完熟采收增糖的主要原因。更多还原

【Abstract】 The effect of delayed harvest on sugar accumulation of juice sacs in satsuma mandarin fruit and the characteristics of photosynthates translocation and partitioning within fruit at different development stage were studied. The results showed the contents of glucose, fructose and sucrose were increased by delayed harvest. During delayed harvest, 18% of total 14C photosynthates recovered by fruit was diverted to juice sacs, however, over 60% of total 14C photosynthates recovered by fruit was translocated into edible tissues (vascular bundles + segment epidermis + juice sacs). The majority of photosynthates entered juice sacs via dorsal vascular bundles. A descending specific 14C radioactivity gradient existed in the pathway of photosynthates translocation. The specific 14C radioactivity gradient between segment epidermis and juice sacs was elevated with the increase of sugar content in juice sacs. These results indicate that the increase of sugar content in juice sacs by delayed harvest was contributed by the continuous movement of photosynthates into juice sacs driven by the specific 14C radioactivity gradient in the pathway of photosynthates translocation.更多还原