Translocation of nitrogen absorbed by the roots of specific tiller in rice plant.

Abstract

In order to determine the tiller-to-tiller translocation of nitrogen in rice plants, changes in the percentage content and percentage distribution of absorbed 15 in each tiller and the main stem were investigated by the 15 treatment of the roots of fourth tiller (the fourth tiller in primary tiller was expressed as T4) that emerged from the fourth node of the main stem. The quantity of translocated 15 in tillers after absorption by the roots of T4 was arranged in genealogical order by the site of its distribution as follows: daughter tillers of T4 (T41, T44; secondary tillers) > T4 itself > > mother stem (main stem) > younger sister tillers (T5, T7; primary tillers) that emerged from the upper nodes of the T4 emerging node > elder daughter tillers that emerged from elder sister tiller (niece tiller; T31, T34) > elder sister tiller (T3) that emerged from the lower node of the T4 emerging node. It was made clear that the nitrogen-distribution from T4 to T3 that emerged from lower node of the T4 emerging node and to secondary tillers on T3 was extremely low. It was therefore, presumed that a remarkably small quantity of nitrogen was translocated from tillers that emerged from the upper nodes to tillers that emerged from the lower nodes of the stem in rice plant.