Molecular Soil Biology 2015, Vol.6, No.2, 1-6
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crosswise into the vessels in stele then the overground
part.This structure will prevent toxic and pernicious
ions into the plants, thus alleviate the harmful effects
enforced by the salt-contained soil (Poppet et al., 1993).
Figure 1 The effect of different concentrations of NaCl stress on root structure of
S. sungkianica
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Note: Ep: Epidermis; Oc: Outer cortex; Cp: Cortical parenchyma; Ae: Aerenchyma; Wc: Within cortex; Px: Primary xylem; Pp:
Primary phloem
1.1.3 Influence of NaCl upon anatomical structure
of seeding lamina
Lamina is the place where photosynthesis and
respiration happens, and the morphosis of lamina will
be altered under salt or alkali environments (Bai et al.,
2013). Figure 2-A shows the anatomical structure of
S.
sungkianica
lamina of the control group, of which
includes the upper epidermis, mesophyll tissue, lower
epidermis, with no epidermal hair but covered with
cuticle. The epidermis are made by monolayer cell,
with most of its stomata open and concentrate in a
particular area. The number of stoma is highly related
with the conduction of water and air, and have an
effect on photosynthesis and respiration. When the
environment is suitable, the high density of stoma is
good for photosynthesis; when the concentration of
salt or alkali increase, some of the stomata closed in
order to prevent water from over evaporation (Yang et
al., 2011). After one month of growth, the mesophyll
tissue (palisade and spongy parenchym) of the
seedings have not completed it’s differentiation. When
NaCl=50 mmol/L (Figure 2-B), the lamina cells line
up accordingly, and show a deepen of its color when
dying with fast green, which means the cell walls have
been thickened, the same goes with the control group
(Wang, 2008). That all indicate a low concentration of
NaCl presents no significant influence on lamina
growth. When NaCl=100 mmol/L (Figure 2-C), the
structure of blade is damaged, with no clear vision of
mesophyll cell and a shrinkage of upper and lower
epidermis cell; but resistance like the thicken of
cuticle is well observed, which reduce water
evaporation as well as providing structural support
when the blade is dehydrated and wilting; and most of
the stomata are closed to prevent water from
over-evaporation (Yang et al., 2011).
Figure 2 The effect of different concentrations of NaCl stress on leaf structure of
S. sungkianica
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Note: Up: Upper epidermis; Lp: Lower epidermal; Mc: Mesophyll cells; St: Stoma
