International Journal of Horticulture 2015, Vol.5, No.9, 1
-
8
6
Figure 2 Effect of Aluminum on the content of chlorophyll b in
the studied cultivars of
Hydrangea
at complete flowering stage
(µg/ml)
Figure 3 Effect of Aluminum on content of Carotenoids in the
studied cultivars of
Hydrangea
at complete flowering stage
(µg/ml)
Figure 4 Effect of Aluminum on the amount of anthocyanin in
sepals in the studied cultivars of
Hydrangea
at complete
flowering stage (mg/g)
Figure 5 Concentration of Aluminum in the leaves of the studied
cultivars of
Hydrangea
at complete flowering stage (mg/kg)
Figure 6 Concentration of Aluminum in the flowers of the
studied cultivars of
Hydrangea
at complete flowering stage
(mg/kg)
that when aluminum increases more than the available
limit, it will cause a decreasing in chlorophyll, flavones
and Carotenoids. That is because the aluminum will
control on the activity of photosynthesis enzymes and
cause a decreasing in chlorophyll compound and
destroy the Carotenoids as it was mentioned by
(Haag-Kerwer et al., 1999, Lagriffoul et al., 1998,
Okhi, 1986, Loboda et al., 2006).
This may explain the effect of aluminum on the pH of
soil, soluble Al present in the soil when the pH begins
to drop below 6.0. However, it is inconsequential in
the vast majority of soils until the pH drops below 5.5
Even then, it is rarely a problem until the soil pH
drops below 5.0. However, the concentration of
soluble Al increases dramatically in nearly all soils as
the soil pH drops below pH 5.0. In these extremely
acid soils, only those species adapted to acid soils
(such as blueberries, cranberries, and acid-loving
ornamentals) or the few crop species bred to tolerate
high soil Al levels can be expected to do well (Abreu
et al., 2003).
Our research mentioned that anthocyanin in deep pink
sepals was more than in blue sepals and that’s agree
with a previous study(Asen et al., 1977) and (Robinson,
1939) that explained that red and pink sepals had six
times as much anthocyanin as blue sepals. But, (Pharr
et al., 2006) reported that there was no difference
among the anthocyanin contents of red, purple, and
blue sepals for the same cultivar. However, if only
those samples are included in which the red, purple
and blue sepals were measured from blooms in the
same plant, there was a tendency for the blue sepals to
have slightly (but not significantly) higher anthocyanin
contents. Moreover, the results in this study indicated
that the Al in leaves was more than in the flowers
(sepals) and that’s similar to the finding of (Jian et al.,
1997) who reported that leaves of Hydrangea contain
Al more than cell-sap and sepals (flowers) and they
