Mode of dinitroaniline herbicide action I. Analysis of the colchicine-like effects of dinitroaniline herbicides

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Colchicine and a variety of dinitroaniline herbicides (DNHs) produce a similar pattern of inhibition of elongation, induction of swelling in the elongation zone, de-polarization of cell enlargement, and induction of multiple nuclei in corn seedling roots. However, a 1000-fold higher concentration of colchicine is needed to produce effects quantitatively similar to those of oryzalin. Both colchicine- and DNH-inhibition of elongation start at about 3 hr. Since these compounds cause swelling and inhibition of elongation in γ-seedling roots, segments from the root elongation zone and intact roots in the presence of cell division inhibitors (all growing without cell division), it appears that the inhibition of root elongation is caused in part by their effect on cell elongation independent of their effect on cell division. Since the growth (increase in fresh weight) of γ-seedling roots and excised root segments is not inhibited by these compounds, their effect on the polarity of cell enlargement must be fairly specific. Unlike colchicine, oryzalin applied to the roots did not cause any significant, visible effect on shoot (mesocotyl and coleoptile) growth. These organs are not resistant to oryzalin, for the IAA-induced elongation of coleoptile segments is inhibited when they are floated in oryzalin solutions. As expected, when coleoptile segments are incubated in ^<14>C-oryzalin, it is taken up rapidly and not degraded. The failure of root-applied oryzalin to affect seedling shoot growth is due to lack of transport to the shoots.
日本植物生理学会の論文

Mode of dinitroaniline herbicide action I. Analysis of the colchicine-like effects of dinitroaniline herbicides

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