Agriculture Reference
In-Depth Information
Table
.
Estimates of dark respiration (R
d
) of parts of an
apple tree expressed on various bases
R
d
(
µ
gCO
h
−
)
g dry wt
−
g fresh wt
−
cm
−
Tree part
Leaf
Stem
Fruits
Roots
-
Values for leaf area for one side only. Values obtained with
air temperatures from
◦
Cto
◦
C and not corrected for
temperature.
From Proctor
et al.
( ). Reproduced with permission.
0.20
0.10
0.01
0.001
5
10
15
20
25
30
35
Leaf temperature (
°
C)
Figure 8.6
The response of dark respiration (
R
d
) of 'Golden
Delicious' apple leaves to temperature. The fitted line is described by
the equation
R
d
=
0.006e
kT
where
k
0.09. From Watson
et al
. (1978).
Reproduced with permission.
=
Fruit respiration
Fruit respiration rates are high early in the season during the cell division
phase of fruit growth when, for apple, they can be about
ng CO
g
−
fresh wt s
−
(
mg CO
kg
−
h
−
) at four weeks after full bloom ( Jones,
=
