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Received for publication 18 Apr. 1986. Cooperative research between ARS/USDA and the Oregon Agricultural Experiment Station, Technical Paper no. 7857 of the latter. We thank commercial plant nurseries in the eastern U.S. for supplying sterile and fruitful ‘Darrow’ plants and for partial financial support of this study. The able technical assistance of Katherine L. Kowalczyk in indexing and field tests, Roy A. George in heat therapy and tissue culture, and Christine K. Weiss in electron microscopy is gratefully acknowledged. 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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