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Influence of Leaf to Fruit Ratio on Nut Quality, Shoot Carbohydrates, and Photosynthesis of Pecan


Leaf to fruit ratios of 2, 4, 8, and 12 were created on girdled shoots of three cultivars of pecan (Carya illinoensis (Wangenh.) C. Koch). Girdling of fruiting and vegetative shoots reduced net photosynthesis to nearly 30% and 3%, respectively, of the ungirdled “checks.” Differences in photosynthetic rates among the various leaf to nut ratios were not detectable. Two leaves, equivalent to 575 cm2 of leaf area, were sufficient to fill one pecan kernel of ‘Sioux’ or ‘Western’. A ‘Mohawk’ leaf to fruit ratio of 4 produced nuts superior in quality to those supported by two leaves. Girdling tended to increase shoot carbohydrates, and starch accumulation was related to leaf to fruit ratio in ‘Mohawk’.