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Photo) 'Riverside' is a seedling selection
from Big Valley, Mills County, Texas, that grew near the confluence
of Pecan Bayou and the Colorado River. It is thought to have
originated from the rootstock of a grafted tree on which the scion
died. The rootstock may be a product of E. E. Risien's early rootstock
development program. Our SSR analysis indicates that it is probably
a cross between 'Longfellow' and either 'San Saba' or 'Family
Use', all of which are Risien's selections. 'Riverside' is commonly
used as a rootstock for the western pecan growing region, due
to demonstrated salt tolerance (see Miyamoto, S., G. Gobran and
K. Piela. 1985. Salt effects on growth and ion uptake of three
pecan rootstock cultivars. Agron. J. 77:383-388.). Although it
also has the reputation of having strong taproots, 'Riverside'
seedlings form good lateral roots under some soil conditions.
Nut germination is limited by poor quality and can be a problem,
since 'Riverside' trees often overbear. .
LJ Grauke , Research Horticulturist &Curator
USDA-ARS Pecan Genetics
10200 FM 50
Somerville, TX 77879
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