Address: Dept. of Phytology, Faculty of Agriculture and Food, Laval Univ., Ste-Foy, Quebec G1K 7P4, Canada.
Received for publication 24 Mar. 1988. We thank Yvon Perron, Jean Masson, and Guy Beaudoin for their help. 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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