Research Associate Professor.
Research Assistant Professor.
Professor.
Received for publication 1 June 1987. We thank James N. Siedow, Stephan Johnston, and A.W. Naylor of the Botany Dept. Duke Univ., Durham, N.C., for laboratory facilities and helpful suggestions during experimentation, and Duke Univ. Phytotron Staff for technical assistance. Clerical assistance was provided by Linda Sentelle, Duke Univ. Phytotron. This project was supported in part by Carbon Dioxide Research Division, Dept. of Energy Contract no. DE-AS05-83ER60177 and NSF Grant no. BSR83-14925 for the Duke Univ. Phytotron. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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