Research Agronomist, Plant Genetics and Germplasm Institute.
Received for publication Feb. 27, 1984. I wish to thank M.N. Christiansen, plant physiologist at the Beltsville Agr. Res. Center, for his valuable comments during the planning of these experiments; and G.J. Ray, biological laboratory technician, for his innovative conduct of the experiments. 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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