1Received for publication April 28, 1972. Journal Article No. 5910 from the Michigan Agricultural Experiment Station, East Lansing.
2Research Associate on sabbatical leave from Shimane University, Matsue, Japan.
3Research Associate on sabbatical leave from Kagawa University, Kagawa-Ken, Japan.
4The authors are grateful to S. Tamura, University of Tokyo and J. MacMillan, University of Bristol for gifts of the gibberellins used in this study.
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