Research Plant Physiologist, Tissue Culture and Molecular Biology Laboratory, Plant Physiology Institute.
Received for publication 11 May 1987. Mention of a trademark or proprietary product by the USDA does not imply its approval to the exclusion of other products or vendors that may also be suitable. I gratefully acknowledge Brenda Pressnall for her excellent technical assistance and Tom Harris for help with statistical analysis. 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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