Received for publication July 15, 1970. This investigation is a portion of a thesis submitted by the senior author in partial fulfillment of the PhD degree in Plant Science, Utah State University. Contribution from the Department of Plant Science and Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Utah Agricultural Experiment Station, Logan, Utah. Published with the approval of the Director of the Utah Agricultural Experiment Station as Journal Article No. 619.
Present address: Department Plant Sciences, Kasetsart University, Bangkok, Thailand.
The authors wish to express their sincere gratitude to the Rockefeller Foundation for financial support of the senior author during the course of this investigation.
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