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• W2439689809 abstract "ZHANG, H., J. M. PLEASANTS AND T. W. JURIK (Department of Botany, Iowa State University, Ames, IA 50011). Development of leaf orientation in the prairie compass plant, Silphium laciniatum L. Bull. Torrey Bot. Club 118: 33-42. 1991.-Leaves of Silphium laciniatum L. are nearly vertical and have compass orientation, i.e., the surfaces face east and west. We studied the manner in which compass orientation develops. Compass orientation was verified by measurements of azimuths for three sets of leaves in the field. Averages of leaf azimuths were 77, 86, and 87 degrees from north. Averages of the absolute value of the differences between leaf azimuth and 900 (east/west facing) were 24, 32, and 15 degrees (random would be 450). Adaxial and abaxial leaf surfaces were equally likely to face east. Newly emerged leaves had random orientation, but within 2-3 weeks compass orientation was achieved by twisting of the leaf petiole. Leaves turned either clockwise or counterclockwise, whichever produced compass orientation with the minimum amount of turning (<900). Orientation involved a growth response; the ability to orient was lost on completion of leaf expansion. Directional sunlight cues were necessary for compass orientation to occur; leaves provided with only overhead light exhibited random orientation. In the absence of directional light, leaves displayed an endogenous, unidirectional turning pattern; a majority of leaves turned counterclockwise. We hypothesize that endogenous turning enables leaves to sample the light environment and that leaves use the position of the sun in the early morning to determine compass orientation." @default.
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• W2439689809 date "1991-01-01" @default.
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• W2439689809 title "Development of Leaf Orientation in the Prairie Compass Plant, Silphium laciniatum L." @default.
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• W2439689809 doi "https://doi.org/10.2307/2996973" @default.
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