Agriculture Reference
In-Depth Information
aeruginosa
cells treated with 4 µmol. L
-1
Cd concentration after 48 h, and who suggested that
this could result from the decrease of the rate constant for energy trappings of PSII reaction
centers. However, Panković et al. (2000) showed that
F
v
/
F
m
was not significantly influenced
by toxic concentrations of
Cd
treatment, while 5 mmol. L
-1
Cd
decreased quantum efficiency
of PSII electron transport (Φ
II
) by 30%.
3.5. Starch and Sucrose Contents
There was an increase in starch concentration but a decrease in sucrose concentration
when plants were exposed to the stress medium (Figure 2)
500
Gebeina
Shang 70-119
450
400
350
300
250
200
150
100
50
0
pH 6.5
pH 4.5
Al
Al + Cu
Al + Cd Al + Cu + Cd
Treatments
400
Gebeina
Shang 70-119
350
300
250
200
150
100
50
0
pH 6.5
pH 4.5
Al
Al + Cu
Al + Cd Al + Cu + Cd
Treatments
Figure 2. Effect of the different stress treatments on starch and sucrose contents in barley leaves.
These changes were more obvious in Shang 70-119 than that in Gebeina. Binary metals
combinations induced further changes in these values for both barley genotypes, but ternary
metals combination resulted in different effects in two kinds of genotypes, more obvious
change was seen in Shang 70-119, but the adverse results occurred in Gebeina when
