Translocation of naproanilide between mother and daughter plant, and its effect on tuberization of Cyperus serotinus ROTTB.

Abstract

Naproanilide [2-(2-naphthoxy) propionanilide] translocation between the mother and daughter plants of Cyperus serotinus was investigated in relation to its effect on tuberization.Inhibition of tuberization was found in both plants when naproanilide was simultaneously applied to their underground parts. When applied to the underground part of the mother plant, tuberization was inhibited not only in the mother plant but also in the daughter plant. When treated to the underground part of the largest daughter plant (n-1 plant), naproanilide inhibited tuberization in n-1 plant and in its daughter plants but not in the mother or other daughter plants. The effects of 2-(2-naphthoxy) propionic acid and methyl 2-(2-naphthoxy) propionate, major metabolites of naproanilide, on the tuberization were similar to naproanilide in all treatments.When the underground parts of mother and daughter plants were applied with 14C-naproanilide at the same time, the concentration of radioactivity was higher in the daughter plants. Considerable translocation through the rhizome was found from the mother to the daughter plants but little from the daughter to the mother plant.It is suggested that the inhibition of tuberization in the daughter plant of C. serotinus was caused by the naproanilied and/or its metabolites translocated from the mother plant, and that the small amount translocated from the daughter to the mother plant was the reason the tuberization of mother plant was not inhibited when the herbicide was applied to the daughter plant.