Volume 55 Number 4 Article 34
Year 2001 Month 10
Title: Fruit Quality of Spur-type and Nonspur-type ´Delicious` Apple Strains
Authors: S.R. Drake, D.C. Elving and E. Fallahi
Abstract:
Six strains of 'Delicious' apples (Malus domestica Borkh.) were evaluated over four seasons for color
(peel and flesh), flesh firmness, soluble solids content (SSC), titratable acidity (TA), individual and total
carbohydrate content and disorders.
Fruit were evaluated at harvest and after controlled atmosphere
storage.
Strains were grouped based on spur-type ('Starkrimson', 'Starkspur Ultrared', 'Oregonspur II')
vs. nonspur-type ('Early Red One', 'Topred', 'Classic') growth habit and compared.
Spur-type apples
as a group were more mature at harvest, but contained both less peel red color and less TA than nonspur-type apples.
After CA storage, spur-type apples were firmer with a higher SSC/TA ratio despite significantly lower SSC and TA values.
Spur-type fruit also displayed a more green-colored flesh and little or no peel color difference depending on storage term.
Nonspur-type 'Delicious' apples from both
WA and ID had higher sucrose content per gram of flesh than spur-type apples.
The proportion of the
total carbohydrate content made up of sucrose was consistently greater for nonspur-type vs. spur-type
fruit in both locations.
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