V. NEW APPROACH TO WATER RELATIONS OF DESERT PLANTS
291
TABLE XX
OSMOTIC POTENTIAL AND NaCl CONTENT OF CELL SAP AND SOIL
AND THEIR SEASONAL CHANGES
0
Species
Halophytes
A triplex
portulacoides
Salicornia
fruticosa
Statice
limonium
Juncus acutus
Salt tolerant
glycophytes
Inula viscosa
Plantago
coronopus
Date
of test
Feb. 12
Apr. 19
May 22
Aug. 1
Sep. 12
Apr. 19
May 22
Aug. 1
Sep. 12
Feb. 12
May 22
Aug. 1
Sep. 12
Feb. 12
Apr. 19
May 22
Aug. 1
Sep. 12
May 22
Aug. 1
Feb. 12
Aug. 1
«After Önal (1966, p. 226,
Cell
Total
(A)
- 3 1 . 9
- 3 7 . 1
- 4 1 . 0
- 6 9 . 1
- 6 6 . 9
- 3 4 . 8
- 4 1 . 3
- 5 9 . 5
- 5 2 . 9
- 2 0 . 8
- 2 3 . 4
- 4 0 . 1
- 4 4 . 4
- 1 8 . 5
- 1 8 . 9
- 1 9 . 4
- 2 5 . 4
- 2 4 . 7
- 1 2 . 9
- 1 8 . 2
- 1 3 . 5
- 1 9 . 4
Table 4).
Osmotic potential (atm)
sap
NaCl
fraction
(B)
- 2 5 . 7
- 2 9 . 0
- 3 6 . 4
- 5 5 . 3
- 4 9 . 6
- 2 9 . 4
- 3 1 . 7
- 4 9 . 7
- 4 9 . 8
- 9 . 8
- 1 8 . 5
- 3 1 . 9
- 3 1 . 0
- 8 . 7
- 7 . 9
- 1 1 . 9
- 1 0 . 8
- 1 1 . 3
- 4 . 9
- 1 0 . 7
- 8 . 1
- 1 4 . 8
Soil
Total
(C)
- 1 3 . 6
- 2 3 . 8
- 3 1 . 4
- 4 8 . 8
- 4 6 . 2
- 2 3 . 4
- 2 1 . 5
- 4 8 . 0
- 5 4 . 7
- 4 . 6
- 1 2 . 8
- 4 0 . 7
- 4 1 . 2
- 5 . 9
- 7 . 5
- 1 1 . 0
- 2 2 . 3
- 1 9 . 5
- 3 . 2
- 9 . 4
- 2 . 1
- 1 0 . 1
NaCl
fraction
(D)
- 1 2 . 7
- 1 9 . 0
- 2 7 . 7
- 4 0 . 0
- 4 1 . 8
- 1 7 . 8
- 2 0 . 6
- 3 8 . 0
- 4 9 . 2
- 4 . 0
- 1 0 . 5
- 3 0 . 2
- 3 0 . 9
- 4 . 5
- 5 . 1
- 9 . 3
- 2 0 . 2
- 1 7 . 5
- 1 . 8
- 8 . 7
- 1 . 8
- 8 . 9
NaCl
fractions :
cell sap
soil
B
" D
2.1
1.5
1.3
1.3
1.1
1.6
1.5
1.3
1.0
2.4
1.7
1.0
1.0
1.9
1.4
1.3
0.53
0.65
2.7
1.2
4 . 5
1.6
growth. Optimal NaCl concentration for root growth is also optimal for
shoot growth (Önal, 1969a, p. 323).
The relationship between soil salt concentration, salt concentration of
the leaf press sap, and the degree of succulence obtained from plants grown