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- Author or Editor: J. T. Worthington x
Difference in optical density (∆OD) of intact ‘Bartlett’ pears (Pyrus communis L.) between wavelengths 690 and 740 nm was measured at harvest and during ripening with a single-beam multiwavelength spectrophotometer. The ∆OD indicated the status of ripeness and detected core breakdown of ‘Bartlett’ pears nondestructively. The ∆OD decreased consistently with ripening and was associated with softening, climacteric rise in respiration, and ethylene production. The ∆OD increased in pears with core breakdown even before external symptoms were visible.
The relationship of soluble solids content (SSC) to sensory quality of several cultivars of muskmelon (Cucumis melo L.) grown in Maryland or California was studied during 3 growing seasons (1970-1972). SSC above 8% was not always associated with high sweetness, flavor, or acceptability. SSC and external color were not highly correlated. Until the relation between SSC and sensory quality has been more thoroughly studied for today’s cultivars, sensory tests should be an integral part of all research involving quality of cantaloupes.
A new portable colorimeter appears promising as a tool for evaluating color of horticultural products. G(green) reflectance values (546 nm) for external fruit color of tomato (Lycopersicon esculentum Mill.) correlated highly with visual scores and Hunter a/b ratios. For ground color of peach [Prunus persica (L.) Batsch], G values decreased as fruits matured and softened.
Two lighting experiments, conducted in the summer of 1967 at Beltsville, Maryland, were designed to evaluate different light sources for tomato color development during ripening. In late winter 1968, additional tests were conducted to determine temperature rise over ambient due to light source.