192
R. Losch and E.-D. Schulze
Prunus dulcis
Lysimeter deplh 1m 2m 3m
5001 yr old 0
• t
2 yr old 0 • •
><
3 yr old A .. . .
~
4 yr old 0
•
IJ
OJ
400\
ff
c
(J
~ ~(I) 300- +
::::J
~
"0
c E
8 ~ 200+(J
-
(J
(J
«I
.5
~
J 0
•
E
ct.
•
::::J
100E
(.)
•
'x
•
«I
(.)
0
~ !!!
~
0
I
I
I
I
I
I
0
100
200
300
400
500
600
700
Average xylem sap ABA concentration (~mol m -3)
Avdat, 1986-89
400 1= ~BAI .... .. : ' ~ " " t 400 ~
200
-~........
200 5
I······
~
~
o
1
1
1
a §
::J
t:~ I
o -IJI---..&.~r· _· · · _· _· _· · _
.. ....;··T·_··_·_·_· -'·"'1---+- 0 ~
«
400 l
t 400 !
200
200 ~
~
~
o
1
0
- «I
.3
o
6
~
ffi
~
East European standard time (h)
Fig. 9.2. Stomatal response of Prunus dulcis to ABA. Lower panel Different daily
courses of stomatal conductance and ABA. Top 2-year-old tree in a 3-m-deep lysimeter,
June 16; middle 2-year-old tree in a 3-m-deep lysimeter, September 5; bottom l-year-old
tree in a 3-m-deep lysimeter, September 15. Upper panel Maximum leaf conductance as
related to average xylem sap ABA concentration. (After Wartinger et al. 1990)