Abstract
Excised seminal roots of rice plants with scutella were cultured aseptically by means of "bi-media" method. The concentration of the glucose supplied from the basal part of the root was 7% at first, then, at various stages of the root elongation, was changed to 0, 1, 3 or 7% (unchanged). Root elongation and branching were depressed as the glucose concentrations decreased. However, at 1 and 3%, the cultured roots branched almost to the root tips, giving rise to the "lion-tail-like" roots which are often found in paddy field. Some possible explanations were discussed on the occurrence of the "lion-tail-like"roots in relation to the depressed nutrio-physiological condition of rice plants.
