Comparative Analysis of the Translocation of [¹⁴C]CO₂-Derived Photosynthetic Products and Foliar-Applied [¹⁴C]-Sucrose in Soybean

Abstract

Photosynthates are translocated into the plant tissue mainly in the form of sucrose. To determine whether there are differences in translocation between internally produced photosynthates and externally applied sucrose, ¹⁴CO₂ or ¹⁴C-sucrose was supplied to specific soybean leaves and the ¹⁴C activity distribution was compared. The distribution rates were almost the same among the above-ground tissues, but different in the roots. Care should be taken when using ¹⁴C-sucrose as a photosynthate, especially when focusing on roots.