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  • Author or Editor: J. L. McMeans x
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Abstract

A 3-year field study was undertaken to determine variations within ‘Moneymaker’ pecans [Carya illinoensis (Wang.) K. Koch] as to oil quantity and fatty acid content of the kernel. Individual pecan trees bore irregularly over the 3-year period. Yields were inversely correlated with nut wt and total oil content and directly with refractive index and potassium concentration of the mature kernel. Six fatty acids were found in kernel oil but only palmitic, oleic, and linoleic were correlated to yield.

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Abstract

Starch and sugars were generally higher in bearing than in nonbearing shoots (wood and bark) of pecan (Carya illinoensis (Wang.) Koch). Decreases in shoot starch were reflected by generally simultaneous increases in either shoot or kernel sugars. Shoot starch fell to its lowest level during the liquid stage of ovule development. Leaf starch generally declined as the growing season progressed. Total sugar levels rose in the kernel, shuck, and shell during fruit enlargement and declined during kernel growth. Mature kernels had less sugar than mature shucks. Ovule sugar was highest during the liquid stage and decreased to very low levels at maturity. Ovule starch generally increased as kernels matured.

Open Access
Authors: and

Abstract

Sugars and fatty acids were measured during fruit development of ‘Moneymaker’ pecan [Carya illinoensis (Wang.)] Koch. Major sugars in the kernel, shell, and shuck were fructose, glucose, sucrose, and inositol; major fatty acids were oleate, linoleate, palmitate, linolenate, stearate, myristate, margarate, and arachidate. During endosperm expansion fructose and glucose rapidly accumulated and fatty acids were present in small concentrations. During embryo and cotyledon expansion fatty acids accumulated and reducing sugars and inositol declined while sucrose increased.

Open Access