Chinese Scholar. Permanent address: Dept. of Horticultural Science, Northwestern College of Agriculture, Wugong, Shaanxi, People's Republic of China.
Received for publication 19 Mar. 1984. This research was supported by the Chinese Ministry' of Education, by Operating Grant No. A6697 of the Natural Sciences and Engineering Research Council of Canada, and by an Agriculture Canada Extra-Mural Grant both held by J.T.A. Proctor. 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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