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Apple growers are seeking more efficient, sustainable production methods that employ reduced inputs to remain globally competitive, insure consistent annual production, and to meet the increasing demand for locally grown fresh fruits. Many factors influence cropping and fruit quality potential including the environment, cultural practices, canopy growth habit, crop history, and endogenous plant hormones (Faust, 1989; Maib, 1996). A better understanding of these factors and how they interact is necessary for further advances in production efficiency. Considering that more than 90% of plant dry weight is derived from photosynthetically fixed carbon, the importance of carbon assimilation and carbon partitioning in optimizing production is evident (Flore and Lakso, 1989; Forshey and Elfving, 1989). The role of light and photosynthesis in tree fruit production, particularly apple, has been well documented (Flore and Lakso, 1989; Lakso, 1994).