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Contributor Notes
Present address: Department of Horticulture and Landscape Architecture, Washington State University, Pullman, WA 99164.
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Received for publication January 20, 1983. Michigan Agricultural Experiment Station Journal Article No. 10669. The authors wish to thank Stan Flegler and Karen Baker, Center for Electron Optics, Michigan State University for assistance with scanning and transmission electron microscopy, respectively. 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.
Abstract
