Volume 47 Number 1 Article 2 Pages: 5-12
Year 1993 Month 1
Title: Influence of Apple Cultivar and Canopy Position on Fruit Spur Leaf Development Within a Season
Authors: B.H. Barritt and B.J. Konishi
Citation
Abstract:
Flowering and fruiting spur characteristics of
'Granny Smith,' 'Lawspur Rome Beauty' ('Rome')
and 'Redchief Delicious' ('Delicious') apples
(Malus domestica, Borkh.) were examined at
two canopy heights throughout a growing season.
The first leaves (primary) to develop on
the fruiting spur were distinguished from bourse
leaves which developed later in the axils of
primary leaves and which formed either a rosette
of leaves or a short shoot.
The primary leaf
number/spur (LNO/SP) declined from about
eight at full bloom (FB) to five at fruit harvest
(FB + 160 days) with all three cultivars.
Bourse
LNO/SP increased from FB to FB + 104 days
and was greatest for 'Granny Smith' and least
for 'Delicious.' With each cultivar, bourse leaves
had greater area/leaf (LA) and dry weight/leaf
(LDW) than primary leaves.
Development of
primary leaf area/spur (LA/SP) and leaf dry
weight/spur (LDW/SP) occurred from 7 days
before FB to FB + 21 days. 'Rome' had greater
primary LA/SP and LDW/SP than 'Granny
Smith' and 'Delicious.' Bourse leaf development
started at FB and continued to FB + 104.
'Granny Smith' and 'Rome' had much greater
bourse LA/SP and LDW/SP than 'Delicious.' At
fruit harvest leaf dry weight/leaf area (LDW/
LA, specific leaf weight) was similar for primary
and bourse leaves and cultivar differences were
small.
Cultivar effects were much greater than
canopy position effects for all leaf traits except
LDW/LA. Fruit dry weight was positively correlated with most bourse leaf traits with
'Granny Smith' but with 'Delicious' the correlations were poor except for LDW/LA.
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