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Laboratory growth studies on sargassum muticum part 3 effects of auxins and anti auxins on extension growth



Laboratory growth studies on sargassum muticum part 3 effects of auxins and anti auxins on extension growth



Botanica Marina 22(5): 273-280



The results of the exogenous application of a number of auxins and anti-auxins to apical 20 mm segments of winter-form primary laterals of S. muticum are described. High concentrations of phenylacetic acid and its p-hydroxy derivative altered the balance of growth between the primary lateral segments and the secondary laterals attached to them. This effect was particularly noticeable in the early winter but diminished as the season progressed until, by April, no response was detected. The anti-auxins 2,3,5-triiodobenzoic acid and N-1-naphth-lyl-phthalamic acid inhibited the extension growth of the primary lateral segments, as did the auxin naphth-lyl-acetic acid. The latter also strongly inhibited secondary lateral growth at 10-4 M whereas 2,3,5-triiodobenzoic acid enhanced it. N-1-naphth-lyl-phthalamic acid at 5 .times. 10-5 M did not significantly affect the growth of these secondary laterals. A number of phenylpropionitriles, which are thought to be converted into phenylacetic acids in plant cells, were strongly inhibitory to the growth of S. muticum segments at 10-5 M.

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