This research aims at studying the effect of irrigation with different levels of NaCl on
the growth and development of Syrian pears (Pyrus syriaca). The results showed that:
1. Salt stress reduced chlorophyll content (a,b and a+b) in salt treatment
s compared to
the control , which contained 67.48 mg/g (a), 111.62 mg/g (b) and 204.76 mg/g (a+b),
while 1750 ppm of NaCl treatment contained 49.34 mg/g (a), 49.86 mg/g (b) and 158.77
mg/g (a+b) respectively. Treatment with 500 ppm of NaCl increased significantly
chlorophyll content compared to other salt treatments.
2. Leaves content of proline increased with increasing NaCl levels. It reached 870.8
ng/g when irrigation water contained 1250 ppm of NaCl, while it decreased in other salt
treatments. Leaves dry matter increased with the increase salt levels (24.50% for the
control, and 44.86% for 1750 ppm of NaCl).
In this study, the effect of different concentrations of sodium chloride
(NaCl) (0, 50, 100, 150 mM) on some physiological characteristics and some
growth indicators of SO4 grape rootstock propagated in vitro was studied at the
laboratories of Gen
eral Commission for Scientific Agricultural Research
(GCSAR), Damascus/Syria. Results indicated that the increase of NaCl
concentration up to 100 mM in culture medium led to reduce the growth
indicators (survival plants, average of the plant length and average number of
buds) with significant differences when compared with the control plants after
4 weeks from culturing on multiplication media, while treatment with 150 mM
of sodium chloride led to death of all plants. Using the concentrations 50 and
100 mM of NaCl also caused decreasing the total chlorophyll content in the
leaves.
This current study was carried out on B41 grape rootstock
micropropagated in vitro at the General Commission for Scientific Agricultural
Research (GCSAR), Syria to study the effect of different concentrations of
sodium chloride on the multiplicati
on and rooting stages. The results showed
that the highest average of survival plants (98%), the number of new buds
(8.43) and plant length (8.58 cm) were obtained in the control treatment after 4
weeks from multiplication stage. The treatment with 50 mM of sodium chloride
led to reduce the multiplication rates with significant differences, while the
lowest plant multiplication had occurred with 100 mM of sodium chloride and
no survival plants were remained by the treatment with 150 mM of sodium
chloride during multiplication stage. The highest rooting rates (% 85.30), the
number of roots (4.67) and root length (6.28 cm) were also obtained in the
control treatment after 4 weeks from rooting stage. The treatment with 50 mM
of sodium chloride led to reduce the rooting process with significant
differences. The lowest rooting results were observed with 100 mM of sodium
chloride and no rooting rate was observed when plants were treated with 150
mM of sodium chloride.
At Tishreen University in the Faculty of Agriculture a study was performed during
the year(2014-2015),The experiment aimd to demonstrate the effect of increasing
concentrations of both sodium chloride(0,10,15,20 dsm-1) and gibberellic acid(0,25,75,
100
mg/l) and their interaction on some yield components of weat (SHAM10).The experiment
was designed as Completely Randomized Design(CRD)by three replicates(3x4x4).Data
were statistically analyzed to find out the least significal differences (LSD)between
treatment at(0,05)level.Results indicated that increasing of sodium chloride concentration
caused significant decreases in yield components(biological
yield,spikelength,numberofspikelets/spike,number of grains/spike,weight of1000 grain and
grains yield/pot.The treatment with GA3 acid especially (75)mg/l indicated significant
increases in all averages of yield components.Results of interacions for both factors
indicated that foliar aplication of GA3 acid counteracted that advers effects of high
concentrations of sodium chlorde of yield components of the (SHAM10).
The method of separation of acetone from its solutions by the ‘Salting out’
effect was studied.
This was interpreted by association of water molecules to the salt ions
formed so decreasing the number of free water molecules because of the
formati
on of a new liquid phase the solubility of organic compound in which is
less than in water.
Separation of acetone, can be explained qualitatively but not quantitatively.
Its mechanism and the molecular and ionic constructions can not be fully
understood by salting out alone.
In order to achieve better explanation, the thermal and concentrations
conditions of acetone separation were determined.
Results have shown that separation takes place, when a second turbid
pronounce phase was taken place by heating the mixture to a certain
temperature. A complete separation occurs when reaching some higher
temperatures.
The state of the hydrolysed molecules of both salt and acetone was shown
quantitatively.
Photosynthetic transport was studied as an indicator of photosynthesis efficiency in
two bread wheat cultivars (ACSAD 899, ACSAD 1059) under the influence of one of the
salt stress.
This study was carried out in sand cultures irrigated with nutrie
nt solution in a
growth chamber, and 14 days seedlings were treated with 100 mM of sodium chloride.
Later the electron transport rates in those plants thylakoids were measured in 21, 28, 35
days of the experiment.
Electron transport rates decreased in ACSAD 899 and reached 57% in the last day of
the experiment, while it was 24.6% in ACSAD 1059.
The decrease in photosynthetic electron transport rate leads to a decrease in the
reduction rate of CO2 and the plant productivity as a consequence. Therefore, it could be
used as criterion to express photosynthesis.
