Abstract
In this paper the effect of temperature on translocation of 32P in rice plant was investigated 32P was applied to the leaf and the distribution pattern of the translocated 32P was determined by means of autoradiography. In case of examining the effect of temperature upon the whole plant body, the experiments were achieved by placing the plants in glass rooms which were adjusted to 17°, 21°, 25°, and 29°C respectively, and for the purpose of examining the effect of temperature on translocation when various temperatures were applied to the translocation passage, about 5cm of the upper part of the internode of the ear-neck, which is yet enveloped in the sheath of the flag leaf was chilled or warmed using an apparatus newly devised by the authors. As the results of the experiments, when the plant body was cooled at about 17°C, translocation of 32P was markedly affected. When the plant body was partially chilled at about 10°C, translocation was blocked almost completely. On the other hand, when the plant body was partially warmed at around 30°C, translocation was restrained too. So either excessively high or low temperatures are not favorable for translocation of nutrients.
