Relationship between the induction of swelling and the inhibition of elongation caused by oryzalin and colchicine in corn roots

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In corn seedling roots, colchicine and the dinitroaniline herbicide oryzalin cause swelling and inhibition of elongation which seem to be interconnected responses, yet they can be separated. First, both colchicine (10^<-3> M) and oryzalin (10^<-6> M) affect elongation (2-4 hr) well before swelling (8-10 hr) . Second, a short (4 hr) oryzalin treatment produces maximal inhibition of elongation but notmaximal swelling. Third, a combination of colchicine and oryzalin (at concentrations which give maximal or saturating effects on swelling and elongation when applied singly) produces a greater effect on swelling (but not elongation) than either alone. Thus swelling and inhibition of elongation are not related in a simple reciprocal relationship and may be, at least in part, separate responses, and colchicine and oryzalin may not act in completely identical ways.
日本植物生理学会の論文