抄録
The influence of light intensity on the translocation of sucrose-C14 in the sweet potato plant, Ipomoea Batatus LAM., has been studied by means of Isotope tracer technique. Sucrose-C14 was introduced into a leaf and then the plants were exposed to light of different intensities (40, 000, 12, 100, and 2, 800 Lux at noon). After 12 hours the distribution of C14 throughout the plants was determined by means of radioautograph. Translocation was mainly downward from the treated leaf to root. The translocation of C14 into root increased progressively with succesively lower light intensity and 70 % of the total C14 was found in root under the lowest light intensity. The rate of C14 distribution to leaves was decreased in parallel to the lowering of light intensity.
