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Indole-3-acetic acid was applied asymmetrically to the hypocotyls of sunflower (Helianthus annuus L.) seedlings.  After 5 hours on a clinostat, auxin gradients as small as 1 to 1.3 produced substantial (more than 60 degrees) hypocotyl curvature.  This result suggests the asymmetric growth underlying hypocotyl gravitropism can be explained by lateral auxin redistribution.

Effect of Asymmetric Auxin Application on Helianthus Hypocotyl Curvature