Received for publication 27 Feb. 1984. Paper No. 9179 of the Journal Series of the N.C. Agr. Res. Ser., Raleigh, N.C. The authors wish to acknowledge the assistance of E.P. Maness, Research Analyst, for her contributions to this research paper. Supported in part by a USDA, S-9 Southern Region Germplasm Exploration Grant. 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.