Volume 48 Number 2 Article 13 Pages: 126-130
Year 1994 Month 4
Title: Influence of Rootstock on 'Delicious' Apple Fruit Shape
Authors: B.H. Barritt, M.A. Dilley and A.S. Konishi
Citation
Abstract:
Differences in scion growth, measured as
trunk cross-sectional area (TCA), were observed
for trees on 32 apple rootstocks during two
seasons.
M.27 EMLA (E), P.16, V3, and E22
were the least vigorous rootstocks and P. 18,
A.313, and seedling the most vigorous.
Fruit
length/diameter (L/D) ratio, a measure of fruit
elongation and typiness, for 'Starkspur Supreme'
and nedchief (Campbell) Delicious' varied with
rootstocks and season.
Fruit were more elongate
during a growing season that was cooler among
the two seasons.
The relationship between rootstock
vigor and fruit L/D ratio was curvilinear
with both delicious' strains in both seasons.
Trees on the most dwarfing rootstocks M.27E
and P.16 had the lowest fruit L/D ratio.
As
rootstocks increased in vigor from extremely
dwarf to semidwarf, e.g., M.7, fruit L/D ratio
was higher.
Fruit L/D ratio for rootstocks more
vigorous than M.7, e.g., P18 and seedling, was
similar to that for semidwarf rootstocks.
Rootstock
accounted for 40 to 83% of the variation in
fruit L/D ratio, depending on the season and
'Delicious' strain.
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