Nineteen locally selected potato lines were screened for water stress
tolerance by measuring the growth parameters in vitro. The stress was achieved
by adding 4% of sorbitol to the growth medium. Plant height and diameter,
leaf area, number, lengt
h and diameter of roots and plant fresh and dry weight
were measured. The results showed a difference in the response of the studied
lines to water stress, cluster analysis, based on the sum of all growth
parameters relative values of the lines showed that the lines were divided into
three groups according to water stress tolerance: The tolerant group, the
moderate tolerant group and the sensitive group. The results indicated the
possibility to use the in vitro method to screen the potato lines for water stress
tolerance.
This research work was carried out in the nursery field of the Faculty of
AGgriculture in Tishreen Univesity during the spring growing season of 2012, it involved
studying some chemical characteristics of potato tubers of Five newly introduced vari
eties
of potato ( Atlas, Bureen, Bomba, Rumba and Orla), in comparision with Spunta variety as
a control.
It was showed that the hieghest large tuber were recorded in Atlas ,Burren and
Bomba. Bomba variety showed hieghest standards tubers (7.8 Kg/ m2). It was showed also
the hieghest dry matter (DM=20.5 %), and Ash content (1.01%) in tubers, were recorded in
Rumba variety. Bureen and Spunta varieties showed hieghest values of starch contents
(14.5 % and 14.4%) respectively. While Vitamin C (VC ( , was encountered ( 19.36, 17.6,
and 17.6 mg / 100g) for Rumba, Spunta and Bureen respectively. Also, the highest values
for protein content (1%) and the soluble solid (5%) in tubers were found in Rumba
variety.
This research aims to study the effect of different treatments of potato plants with a
feeding organ on the growth and yield of potato crop and on the quality of tubers. The
Romano variety of potato was used, and the commercial organic feeder "plan
t energy
1000" was applied in four treatments. The treatments were: a control and three ways for
treating the plants with the organic feeder: by roots, foliage spray, and by both in one
treatment.
The completely randomized design was adopted in this experiment. The experiment
was implemented in the nursery farm of Tishreen University in the spring planting season
of 2012.
The results showed that treating potato plants with the organic feeder led in general
to an increase in the growth, which was reflected in the increase in the fresh weight, total
leaf area and its indication, as well as in the quality and number of tubers, total production
and marketing quality. These results were clearer in the case of the joint treatment: root
feeding and foliage spray together. This treatment showed significant superiority in
increasing production and improving its quality.
In this research, protoplast isolations were obtained from the leaves of
Potato Binella cultivar at the laboratories of Agriculture College- Damascus
University in order to determine factors affecting the yield and viability of
protoplast isolation. Results indicated that the best yield percentage of isolated
protoplast.
This study was conducted at Abo Jarash farm, Faculty of Agriculture,
Damascus University In order to determine the response of three local varieties
of potato (Sponta, Draja, Diamont) to salinity stress with different
concentration of NaCl solutio
n (0,50, 100, 150, 200 mM). The results indicated
that the existence of a inverse correlation between increased concentrations of
salts in the solution and the rate of plant height, leaf area, and the percentage of
leaf dry weight, and the proportion K+/ Na+., and the productivity was declined
with a proportional rate 22< 32, and 48% for the varieties of Sponta, Draja,
Diamont, respectively. Results indicated the existence of reverse relationship
between increasing salt concentration in the medium and plant height, Leaf
area, dry weight of the leaves and K+/Na+ ration in addition to the decline in the
productivity of studied varieties. The results also showed variations in the
extent of tolerance between studied varieties to salinity stress where Sponta
was the most tolerant, followed by Draja and Diamont was the less tolerant and
this was reflected in terms of higher germination and increasing the mean of
plant height, Leaf area and dry weight of plant.
This search carried out to study the effect of treatment with some fungicides
(mancozeb + metalaxyl - M, chlorothalonil ،azoxystrobin and mancozeb) in
control late blight (Phytophthora infestans Mont.) on potato va. Spunta and
yield in homs during
two seasons 2008 and 2009. The results showed that the
use of a mixture of fungicides (mancozeb + metalaxyl - M) gave the superior
efficacy in controlling the disease during two seasons compared with other
treatments. The percentage of effect (74.32% and 57.24%) during 2008 and
2009, respectively. While, the fungicides (mancozeb) gave the lowest effect in
controlling the disease during two seasons, where as the percentage of effect
(31.95% and 40%), respectively. Recorded results showed that spray of potato
plant with tested fungicides increase the yield compared with untreated plants.
The mixture fungicides (mancozeb + metalaxyl-M) increase in yield (35.55%
and 32.285) during 2008 and 2009, at respectively. We can arrange the tested
fungicides according to their the efficacy in controlling the disease and in
increase the yield such as following: mancozeb +metalaxyl-M> chlorothalonil>
azoxystrobin> mancozeb.
The effect of green manure and biofertilizer by using (Lupinus albus and
Lupinus albu s + Rhizobium) on some soil properties and potato growth and
production during two successive seasons of 2007/2008 and 2008/2009 was
studied. The results showed
that green manure provided the soil with 3.75
kg/m2 green organic matter including (398 g dry matter and 14 g nitrogen),
while lupinus albus + Rhizobium provided the soil with 4.55 kg/m2 green
organic matter including (581 g dry matter and 22.3 g nitrogen) and improved
soil chemical properties. The results showed as well that biofertilizer significant
improved potato growth parameters: plant and tuber dry matter, foliage
surface, foliage index, plant length, plant elements content (N,P,K,Ca and Mg),
tuber number and their content of nitrate and protein .The results showed as
well that biofertilizer significant improved marketing potato yield.
Effect of organic and bio fertilizers (Azotobacter and phosphate solubilizing
bacteria) on production of potatoes and some soil properties was studied in
Tartous.
The experiment consisted of 4 treatments (control soil, soil+manure, soil+
bioferti
lizer and soil+manure+biofertilizer) each replicated four time, for 2004
and 2005 seasons.
Total N, available P, available K, and organic matter in soil were
determined.
Significant increases were observed in most of the inoculated and organic
fertilized treatments compared with the control. However, the treatment
(soil+manure+biofertilizer) was the best and showed significant increases in
potato yield compared with other treatments especially in the next season.
However, the second season was better in yield increase in all treatments
than the first seacon.
Marfona cultivar were chemical mutagen using 20, 30 and 40 mM of Ethyl Methane
Sulphonate (EMS) for 2, 3, 4 hrs in 2013. was conducted to improve potato (Solanum
tuberosum L.) tolerance to salinity. Plants Marfona mutagen from M5 and unmutagen were
cultured with Spunta and Falouka Cvs in 2015. Plants were later subjected to another
selection pressure, by irrigating them using water containing Nacl between 0-200 mM The
results showed that the gradual increase in Nacl concentrations caused a significant gradual
decreases in most vegetative, yield and its component characteristics. Mutant plants varied
with unmutant for Marfona, Spunta and Falouka in plant height varied from 68 to 41 cm
and number leaves varied from 21 to 12 leaf. and stem diameter varied from 1.349 to 0.370
cm and leaf area varied from 235 to 84 cm2. However, produced tubers number varied
from 9.3 to 2.8 and weight them from 740 to 155 grams and tuber weight from 75.2 to 24.6
grams.
The results also showed variations in the extent of tolerance between studied
treatments to salinity stress where 4T3P2 treatment was the most tolerant.
This study was carried out in the nursery gardens of Tishreen University in the
early spring period in 2014, to study the effect of different levels of dry organic manure in
the growth and productivity of potato plants (class Spunta), in randomized
complete
design, study included six treatments: control ( cow organic manure amount of 4 kg/m2)
and five treatment with five levels of dry organic manure (100-150-200-250-300 g/m2)
.The results showed an increase in stem height, number of stem, foliage area, production
and percent of standard tubers by adding dry organic manure at level of 250 g/m2 while
Treatment with 300g/m2 contributed an increase of folige area, height of plant and stem
number while causing reduced plant production,tuber average weight and production of
standard tubers.The result showed also no significant differences between the control and
the treatment of 250 g/m2dry organic manure in each of the folige area, production and
standard tubers
