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It is very important to visualize the process of nutrient absorption and distribution to study the physiological activity of the plant. We developed a real-time radioisotope (RI) imaging system, where RI tracers were applied to the plant sample. This system allowed the quantitative measurement concerning the uptake of nutrients labeled with radioisotopes, such as  45 Ca,  35 S,  32 P and  14 C as long as several days. The  β -rays emitted from the sample were converted to light by a CsI(Tl) scintillator and were guided to a highly sensitive CCD camera. The scintillator surface was covered with an Al plate to avoid LED light penetration but allow selected  β -ray penetration. We employed  Lotus japonicus  for the plant sample and observed the  32 P-phosphate absorption in roots and the accumulation to the aboveground part of the plant. The environment condition of daytime and night was simulated by the ON/OFF of LED timer and the accumulation manner of the  32 P-phosphate in roots and leaves during daytime and night was analyzed. The accumulation of  32 P-phosphate in leaves was highly dependant on light irradiation and higher when the LEDs was turned on, whereas the absorption of  32 P-phosphate in root was higher when the LEDs was turned off. The transfer function concerning the transportation of phosphate within the plant during the developmental stage was obtained from the analysis of  32 P uptake images. We are now trying to get specific moving images of each radioisotope when two kinds of isotopes, such as  32 P and  35 S, were applied at the same time to the plant, through an image analysis.

A study of 32 P-phosphate uptake in a plant by a real-time RI imaging system