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Partitioning of carbon and nitrogen reserves were examined in two cultivars of rabbiteye blueberries  (Vaccinium ashei]  differing in their timing of vegetative budbreak relative to floral budbreak. Floral budbreak precedes vegetative budbreak in `Climax', while floral and vegetative budbreak occur concomitantly in `Bonita'. Twenty eight containerized plants from each cultivar were dual labeled in the fall with 105 μCi of  14 C0 2  and 0.6 g of nitrogen enriched with 5%  15 N. Plants were grown outdoors throughout the winter and the following growing season. At five dates, beginning 27 days prior to full bloom and ending at fruit maturity, plants were harvested into old shoots, roots, fruit, and vegetative growth.   Fall leaf drop accounted for loss of 12% of applied N and 20% of applied  14 C. In the first harvest, approximately 73% of the recovered  15 N and 50% of the recovered  14 C was in the roots for both cultivars. By fruit maturity, approximately 8% of the recovered  15 N was in the fruits, 51% in new vegetative growth, and 41% in old shoots and roots. Approximately 1.2% of the recovered  14 C was in fruit, 1.5% in vegetative growth, and 97% in old shoots and roots. Data suggest that differences in the timing of vegetative budbreak between these two cultivars do not influence overall partitioning patterns of reserve carbon and nitrogen.

CONTRIBUTION OF CARBON AND NITROGEN RESERVES TO VEGETATIVE AND REPRODUCTIVE GROWTH OF RABBITEYE BLUEBERRY