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.
A salt stress was applied from 3rd leaf stage until the maturation on three tomato
cultivars (Marmara, Levovil and Picolino). The salt stress was achieved by increasing the
solution EC from 3 (control) to 6.7 dS/m for, Na and Na+Ca treatments, resp
ectively. The
stress induced a significant increase in vitamin C of Marmara and Levovil fruit content
(20.94 and 23.03 mg/100g) as compared to the control (16.62 and 19.43 mg/100g,
respectively). The titratable acidity was increased significantly (17%) only in Marmara and
Picolino. The fruit content of fructose was increased in Levovil and Picolino by 1.4 and 1.7
folds, respectively, as compared to control (11.13 and 18.8g/kg, respectively). While the
content of N in Levovil and Picolino was decreased, under stress, by 33 and 58% as
compared to the control (0.12 and 0.19%), respectively, the P content was increased. The
salt stress decreased the K content in Levovil and Picolino to reach to 0.22 and 0.26% as
compared to control (0.27 and 0.29%), respectively. The calcium addition modified the
stress impact. A significant increase, was registered in Ca content under stress in Marmara
andPicolino as compared to control, while the calcium addition did have any effect on.
Yhis study was investigated at Agriculture Faculty of Damascus university
during the agricultural season of 2012/2013 in order to determine the effect of
foliar spray with seaweed extract (5 and 10 g/l) and GA3 (50 and 100 ppm) on
the growth and p
roduction of local red onion (Baladi) at different levels of
irrigation (100, 75, and 50% of field capacity). Onion bulblets were planted in
pots and plants were treated when they had 3-4 leaves and every two weeks
until full vegetative growth.
This study was investigated at the laboratories of Horticultural department,
Faculty of Agriculture, Damascus University to measure the changes in
oxidative and antioxidative parameters during tomato fruit growth. Hydrogen
peroxide (H2O2) and lipi
d peroxidation (MDA) contents were analysed as
indicators of oxidative processes. Results showed that H2O2 content decreased
during fruit growth phase and slightly increased during ripening, meanwhile
MDA content was found to increase only at the end of fruit ripening. The
activities of antioxidant enzymes (SOD, APX, CAT) were modified during fruit
growth. Activities of SOD, APX increased during fruit growth phase,
meanwhile CAT activity increased during fruit maturation. The level of
ascorbate increased during fruit growth. These changes in antioxidant
metabolites and enzymes establish that the antioxidant system plays an
important role in the both phases of tomato fruit growth.
The research aimed to compare three hybrids of broccoli (Condi, Kuba and
NS50), grown under Damascus environment, for their morphological, yield and
quality characters. The results showed that NS50 had the largest number
(p<0.05) of leaves and ste
m length, Kuba had the greatest (p<0.05) main head
and the stalk length, In addition, higher TSS and vitamin C content while NS50
hybrid showed the best firmness, the highest chlorophyll and carotene contents
and higher fresh weight of main head than Condi. The lateral heads number
and their fresh weight were higher in Condi than the other hybrids.
This research was conducted at two distinct environmentally locations,
Jellien and Al-Somakiate belong to Dara'a Research Center, the General
Commission for Scientific Agricultural Research during 2011-2012 growing
season. 13 garden pea genotypes
were planted according to a randomized
complete block design with three replicates to study the performance of these
genotypes for 10 important quantitative traits and to detrmine the genotypic
and phenotypic coefficients of correlation between the traits studied.
Results showed that there were significant differences among the genotypes
for all traits studied at both distict locations. The genotypic correlation
coefficients were higher than corresponding phenotypic correlations, in
addition, the value and direction of correlation coefficient at both levels were
different from location to another. Green pod yield showed positive and
significant correlations with pod width, harvest index and 10-green pod weight
at Jellien location, and with pod length, pod width, pods number per plant and
10-green pod weight at Al-Somakiate location.
تتميز طرز البندورة المحلية بالعديد من الصفات المهمة بالمقارنة مع الهجن المدخلة وتعد مخزوناً وراثياً قيماً يجب المحافظة عليه
نفذ البحث خلال الفترة 2013-2016 م في كلية الزراعة بجامعة دمشق , بهدف دراسة تأثير المعاملة ببعض المواد الكيميائية والطبيعية ( 1- ميثيل سكلو بروبان , ونتروبروسيد الصوديوم , الشيتوزان , وأمينوفينل علايسين , والميثيل جاسمونات , وفيتامين E ) في القدرة الت
خزينية لثمار البندورة ( الهجين Tala ) وصفاتها البيوكيميائية ( نسبة المواد الصلبة الذائبة TSS ونسبة الحموضة القاتلة للمعايرة TA ) والفيزيائية ( الصلابة ونسبة الفقد بالوزن والفقد المطلق ومؤشرات اللون ) ومعايير الأكسدة ومضادات الأكسدة .
