Studies on Photosynthesis and Translocation of Photosynthate in Mulberry Tree : III. Translocation of 14C-photosynthetic product from leaves of different ages

[摘要] Translocation of photosynthetic product was investigated in young mulberry plants using a radio-isotope 14C as a tracer. The results obtained will be summarized as follows. 1. Most of photosynthetic product translocated from the fed leaf in 3 to 4 days after the administration, remaining 20-30% of photosynthetic product in the fed leaf. 14C-photosynthetic product was mainly distributed to stem, stump or root, but scarcely translocated to mature leaves. 2. Distribution rate was relatively high to stem tip from upper leaf, while rate to stump or root was high from lower leaf. 3. When the whole shoot was fed with 14CO2, the specitic activity of leaf in successive leaves immediately after the administration resembled the variation of photosynthetic activity in successive leaves measured by infrared gas analizer. Plants with longer days after planting distributed larger proportion of photosynthetic product to stump or root. The author wishes to express his sincere thanks to Dr. K. Hazama and Dr. K. Ohyama, Sericultural Experiment Station for their encouragement and guidance throughout this work. Thanks are also due to Dr. M. Hoshino, National Grassland Research Institute for his helpful advice in the isotopic treatment and to Prof. T. Tazaki for valuable criticism in the preparation of this paper.

[学科分类] 农业科学（综合）