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Ecophysiological consequences of non-random leaf orientation in the prairie compass plant, Silphium laciniatum by Thomas W. Jurik; Hanzhong Zhang; John M. Pleasants is a Environmental Science article available to read on EtoBox.

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The prairie compass plant (Silphium laciniatum L.) has vertical leaves that are characteristically oriented in a north-south plane (i.e., the flat surfaces of the lamina face east and west). We explored the consequences of this orientation by determining basic photosynthetic and water use characteristics in response to environmental factors and by determining total daily photosynthesis and water use of leaves held in different orientations. Average maximum CO exchange rate (CER) of leaves near Ames, IA was constant at 22 micromol m s from May through August and then declined. CER did not exhibit a distinct lightsaturation point. CER at photon flux densities near full sunlight was constant from 22 to 35°C leaf temperature but declined at higher temperatures. However, leaf temperatures rarely exceed 35°C during the growing season. There was no change in the pattern of response of CER to temperature over the growing season. We constrained leaves to face east-west (EW,=natural), to face north-south (NS), or to be horizontal (HOR) on eight days in 1986-1988. EW leaves had the highest light interception, leaf temperatures, CER, and transpiration early and late in the day, whereas HOR lea

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Author

Thomas W. Jurik; Hanzhong Zhang; John M. Pleasants

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0029-8549)

Published

1990

Language

EN

Field

Environmental Science (Physical Sciences)