Volume 50 Number 1 Article 8
Year 1996 Month 1
Title: Rootstock Affects Ripening, Color, and Shape of ´Starkspur Supreme Delicious` Apples in the 1984 NC-140 Cooperative Planting
Authors: W.R. Autio, R.A. Hayden, W.C. Micke and G.R. Brown
Abstract:
In 1984, 'Starkspur Supreme Delicious' apple
trees on B.9, MAC.l, MAC.39, P.1, P.22, domestic
seedling, M.4, M.7 EMLA, M.26 EMLA, B.490,
P.2, P.16, P.18, C6, and A.313 were planted in
Belchertown, MA, West Lafayette, IN, Parlier,
CA, and Princeton, KY. In Massachusetts, rootstock
and year interacted to affect fruit ripening,
as measured by internal C2H4 concentration,
soluble sob'ds concentration, the development
of watercore, and starch disappearance.
In general, however, ripening was correlated with tree
vigor, with the most dwarfing rootstocks resulting in the earliest ripening.
The most consistently
early ripening fruit were from trees on B.9 and
P.16, and the most consistently late ripening
fruit from trees on M.4, P.18, and domestic
seedling.
Soluble solids concentrations from
Indiana and California fruit supported this relationship between ripening and vigor; however,
no consistent effect of rootstoclc on soluble
solids concentration was measured in Kentucky.
Flesh firmness was negatively related to tree
vigor in California, positively related to vigor in
Indiana, and not related to vicor in Kentucky
and Massachusetts.
The development of red
color was negatively related to vigor in California and not related to vigor in Indiana.
The
length-to-diameter ratio of fruit was positively
related to vigor in Indiana.
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