Growth-regulating Substances in Laminaria agardhii

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Abstract
After 16 days in sea water or sea water plus indoleacetic acid (0.1, 1, 2, 5, or 10%) at 18-21[degree]C, 360 6-mm. discs of Laminaria, taken from lamina and from transition zone between lamina and stipe, were individually blotted and weighed, and the amt. of disintegration recorded. All discs of stipe-lamina junction disintegrated in sea water containing IAA, even at low concns.; those of the lamina disintegrated in the higher concns. (2-10%); but those in lower concns. showed greater wt. increase than did those in plain sea water (7.5% in sea water, 12% in 0.1% IAA). Petroleum ether extracts of stipe-lamina junction mixed with lanolin and evaporated gave positive Avena coleoptile tests 8 hrs. after application.(more prominent after 17 hrs.). These results indicate the presence in the alga of growth-regulating substances related to IAA.

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