Abstract
The influence of tetrapion (sodium 2, 2, 3, 3-tetrafluoropropionate, TFP) on the growth and organ formation of callus derived from rice seedlings was examined in order to study the plant growth inhibition mechanism of this herbicide.
Although a concentration of about 2mg/l resulted in 50% growth inhibition in rice seedlings, only slight growth inhibition was observed in rice callus even at the high concentration of 1, 000mg/l. The initiation of bud differentiation was slightly inhibited by tetrapion but inhibition of development from differentiated buds to plantlets was quite remarkable.
These results suggest that basal metabolisms required for life itself, growth, and the reproduction of cells are not inhibited by treatment with this herbicide, and its inhibition target is in the morphogenetic process, including the skeleton structure construction in the tissue and organs.
