Volume 51 Number 1 Article 7
Year 1997 Month 1
Title: Colorimetric Characterization of Red Pear Cultivars
Authors: M.C. Dussie, D. Sugar, A.N. Azarenko and T.L. Righetti
Abstract:
Fruit color was characterized in eight red pear cultivars by measurement using the Commission
Internationale d'Eclairage L* a* b* color space coordinates.
Color was measured on sun-exposed
and shaded fruit surfaces at mid-summer and three times during harvestable fruit maturity.
All
cultivars gained red color (a* value) on the sun-exposed surface during the growing season, but
varied in yellowness (b* value}. Hue angles calculated from these values described differences in
color change and color at final harvest.
Color response on the shaded fruit surface varied among
cultivars to a greater extent than on the sun-exposed surface. 'Rosired Bartlett' and 'Rogue Red'
became darker (decreased in L* value) and redder (decreased in hue angle) with maturity on both
sun-exposed and shaded fruit surfaces.
All other cultivars became lighter and less red with maturity.
'Rogue Red' and 'Cascade' showed the greatest difference in hue between sun-exposed and shaded
fruit surfaces, indicating a strong degree of bi-color.
The least contrast between fruit surfaces was
in 'Starkrimson' and 'Gebhard Red Anjou.'
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