Volume 69 Number 1 Article 8 Pages: 51-57
Year 2015 Month 1
Title: Survey of Moldy Core Incidence in Germplasm from the Three U.S. Apple Breeding Programs
Authors: Julia M. Harshman and Kate Evans
Citation
Abstract:
Moldy core, mainly caused by Alternaria spp., in apples has been studied in a limited number of cultivars, and
susceptibility is attributed to open sinuses and calyxes in the fruit.
In three US apple breeding programs, a diverse
germplasm collection was characterized for core opening, calyx opening, and moldy core incidence at several
time points during storage.
Ten cultivars showed signs of moldy core, all had open cores while only three had
open calyxes.
Fruit with either an open core or an open calyx increased the likelihood of moldy core incidence.
Two susceptible cultivars, ‘Gingergold’ and ‘Pinova’, also had progeny with high incidence of moldy core.
A separate
project screened 707 seedlings with diverse parentage in the Washington State University breeding program
for core opening, calyx opening, sinus opening and moldy core incidence.
Only four of the seedlings had open sinuses,
and all failed to develop moldy core.
The cultivar survey information presented here may be useful to other
breeders, horticulturists, and pathologists interested in determining the heritability for moldy core susceptibility.
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