Abstract
This paper gives the result of research made to find the influence of soil and air temperatures on the translocation of foliar-applied sucrose-C14 in the sweet potato plant in 1960. When plants were held in darkness over night (12 hours) at soil and air temperatures of 15°, 20°, and 25°C respectively, sucrose-C14 applied on a single leaf was translocated mainly into the rots and actively growing stem. The C14 accumulation rate in root was generally much higher in the air temperature treatment condition than in the soil temperature treatment ones, and it increased with decreasing temperature, while that in leaves decreased with decreasing temperature in the both cases. When roots of a plant were divided into two groups and each of halves was exposed to different temperature in darkness for 12 and 15 hours, the translocation and accumulation of sucrose-C14 from four expanded leaves were better at 30°C than 40°C, better at 30°C than 20°C, and at 20°C than 10°C root temperature.
