Leaf Epinasty Induced by Reflection of Light from Beneath Marigold Plants

in HortScience
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  • 1 Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706-1590

The cotyledons of marigold, Tagetes erecta L., developed epinasty when reflective surfaces were maintained under the seedlings. Plain aluminum foil or white-painted foil induced up to 360° curvature as the cotyledons extended, whereas no epinasty occurred over the exposed surface of potting mix or black-painted foil. A gray-painted foil induced intermediate epinasty. Dry-weight accumulation of the seedlings was not significantly affected by the epinasty.

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