The aime of this study was to isolate and identify the seed borne fungi of two
varieties of Soybean, Sb172 and Sb44, using blotter method and P.D.A plate method.
21 species belong 10 genus were determined, saprophyte and pathogen Fungi.
P.D.A plat
e method showed the highest number of fungi in comparison with the
other method, and the fungus Aspergillus was the most frequent genus with a ratio of
44.2% for the variety sb172 and 45.14% for the variety sb44, followed by the fungus
Cladosporium and then Fusarium, whereas the genus Colletotrichum showed the lowest
frequent ratio (0.85%) with the variety Sb172.
The percentages of seeds germination and infection were differed between the two
varieties, and the ratio seeds germination of variety sb172 were higher than the variety
sb44 with the both methods of culture, and were equal 94% with prim variety and 92%
with the second ones by blotter method, whereas the ratio were 52% and 34% for both
varieties respectively by P.D.A plate method. However, the ratio of infection were, in
general, lower with prim variety than the second ones by the both method.
The results showed the seeds which were highest ratio infection appeared low ratio
germination .
The effect of different treatments on carob seed germination was studied.
The results showed that, seed scarification was the most effective method in
increasing germination rate as well as the use of concentrated sulfuric acid for 30 minutes
reac
hing 100%, followed by the treatment with alcohol for 60 minutes, and immersing
seeds in hot water for 60 minutes.
The results also indicated that the speed of germination when seeds were scarified
was the best (I.D.=14.5), followed by the treatment with concentrated sulfuric acid for 30
minutes (I.D.=21.5), alcohol for 60 minutes (I.D.= 38) and immersing seeds in hot water
for 60 minutes (ID.=60).
This investigation was conducted at the laboratories of Horticulture
Departments, Faculty of Agriculture to study the effect of different levels of
salinity (NaCl) in the rate and the percentage of seed germination of lettuce,
Lactuca sativa L. va
rieties: Shinshar and Kabous and to determine the seedling
response to these levels of salinity with relative to root length, the length of the
cold, fresh and dry weight of seedlings. NaCl was used at 0, 50, 100, 150 and
200 mM/l. Resulted showed that a gradual increase in salinity concentrations
caused a gradual decline in all indicators studied in both cultivars. However,
the plants of Kabous variety were less sensitive to the salinity and also higher
than in the indicators studied for seedlings (rate of germination and percent,
stems and roots length, fresh and dry weight of seedlings) under salt stress
conditions.
This study was carried out on three rootstocks of Crataegus monogyna Jacq.
With one seed containing fruit C.oxycantha L. with three seeds as well as C.
azaraolus Borkh, to identify the best method of Crataegus propagation.
The hardwood cuttings of
C.azarolus Borkh rooted in a IBA solution (4ooo
ppm)showed the highest rooting percentage 20% when grown in sand as well as
peat moss containing fermented arganic manure media.
The research was conducted in the ornamental plants laboratory, Faculty of
Agriculture, to determine the best seed germination conditions of Sophora japonica and S.
secundiflora. Different seed pre-treatments (cold ater (6oC) and warm water (50oC)
immersing, Citric acid (2%) and Sulphoric acid (25, 50%) stratification) were
experimented. The effect of different culture mediums and sowing times were also
investigated.
The results indicated that the chemical pre-treatments represented the highest relative
germination rates compared to the physical pre-tretments. Among the physical pretreatment,
the seed immersed in hot water for 2h showed the highest germination
percentage (38,6 – 30%) for S. japonica and S. secundiflora respectively. While, the seed
treated with sulphoric acid represented the best germination percentage for the tow species
(58,3 – 63,6%). Nevertheless, the increase of the sulphoric acid concentration had a
negative impact on survival plantlet rates for the tow species, specially for S. japonica.
The results showed that the seed sowing in sand with soil and organic mature (1:1:1)
medium realized the best germination percentage for the tow studied species.
تعد شجرة اللوز من الاشجار الهامة والمتميزة اقتصاديا في سوريا لأنها تعتبر الموطن الأصلي لشجرة اللوز . الشجرة متوسطة حساسة لدرجات الحرارة المنخفضة ولا تتحمل الرطوبة الزائدة لذلك تزرع في مناطق محددة من العالم
