Professor, Dept. of Horticulture, Pennsylvania State Univ., Univ. Park, PA 16802.
Scientist, Plant Physiology Division, DSIR, Palmerston North, New Zealand.
Received for publication 9 Feb. 1984. Contribution No. 35 and 36. Dept. of Hort., The Pennsylvania State Univ. Authorized for publication as Paper No. 6803 and 6804 in the Journal series of the Pennsylvania Agr. Expt. Sta. We gratefully acknowledge the contributions of Helen Turnbull for technical assistance, Roger Haslemore for the carbohydrate analyses, and the staff of the Nursery and Technical Systems groups for supplying the plants and maintaining the controlled environment rooms used in this study. 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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