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Register a new userThe effect of Gamma radiation on rooting of some poplar cultivars
تأثير أشعة غاما في تجذير عدد من أصناف الحور
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Damascus University ورقة بحثية
Publication date
1995
fields
Forestry and Ecology
and research's language is
العربية
Authors
أكرم سليمان الخوري( باحث )
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Shamra Editor
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درس تأثير الجرع 200-400-800 راد من أشعة غاما، في تجذير أربعة أصناف من الحور، بعضها محلي، و الآخر أدخل حديثًا إلى سورية. و بينت نتائج هذه التجربة أن استعمال الجرعة ٢٠٠ راد أدى إلى زيادة نسبة التجذير، و زيادة طول الجذور المتكونة، أما الجرعة ٨٠٠ راد فقد كان لها أثر تخريبي، و قد يعود ذلك إلى تخريب أو تحطيم الأوكسينات الموجودة في العقل. و لم يلحظ وجود فروق معنوية بين الجرعات على وزن الكتلة الجذرية، و حيث لحظ تقارب بين الحور الأبيض الرومي و الأسود الحموي، من حيث متوسطات الكتلة الجذرية من جهة، و تقارب آخر بين الهجين ٢١٤ و الباخوفيا الروسي من جهة أخرى.
Effect of different doses of Gamma radiation (٢٠٠, ٤٠٠, and ٨٠٠ Rad) on rooting of different clones of poplar was investigated. Results showed that the dose of ٢٠٠ rad had a great effect on rooting. Percentage and the root length. On the other hand, the dose of ٨٠٠ rad had a negative effect on rooting. The negative effect could be to the breakdown of the auxins in the cuttings. It had been noticed that there was similarity among means of root weights with regard to clones of Populus alba cv. buchovina. As for as the doses were concened, these were no signix ficant diffecsnses among maens of that ments.
References used
Al Bachir. M. ١٩٩٥ The effect of low doses of gamma radiation on root farmation of olive cuttings. Germania Agribiological Researeh.
Bors.j. Zimmer R. ١٩٧٠. Effect of low doses of x-ray on rooting and yield of carnation stimulation Newsletterno
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This experiment was carried out to study the effect of increasing gamma
radiation doses (up to 24 GY) on the eggs of Callosobruchus maculatus, at
different ages, to determine their effect on egg hatching rate, and other
biological traits of the em
erging adults from eggs treated with sub – lethal
doses.
It has been noticed that the low gamma radiation doses killed most of the
one –day old eggs before hatching, and no adult insect could emerge from
hatching those eggs, and the dose of 12GY caused the same effect, but on two
day-old eggs. when eggs were at the age of 3, 4, and 5 days, gamma radiation
didn’t have influenced on the embryo development, but demise percentage,
increased after hatching.
The percentage of emerged adults was only 1.8% for the eggs treated with
16 GY gamma radiation.
This research was conducted at AlTieba Research Station, General Commission
for Scientific Agricultural Research (GCSAR) in 2012 and 2013 seasons, to study
the effect of different doses of gamma rays on growth and productivity of local
garlic Alli
um sativum L. cultivar “Yabroudi” in Syria. Cloves were exposed to four
different doses of gamma rays of 60Co source 1, 2.5 ,5 ,10 ) Gray). Randomized
Complete Block Design (RCBD) was used .The results showed the surviving plants
after 60 days of planting declined with the increase of dose levels. The percentage
of dead plants at the doses (2.5, 5 Gray) was 50 and 54 %, respectively. Also, it
was possible to obtain a larger number of viable mutations. Therefore, they could
be considered as close as to LD50. The dose (10 Gray) had a negative effect on the
length of the cloves’ germination period, leading to the death of all the plants after
60 days of planting, this could be considered lethal dose (LD100). The response of
the local garlic cultivar Yabroudi to the low-dose (1 Gray) of gamma ray was higher
comparing with other doses. This is due to the positive effect of this dose (Stimulus)
on the vegetative growth that was reflected on the productivity indicators. The
productivity reached (4.50 kg/m2), which was significantly superior to the control
(2.91 kg/ m2) and the two doses (2.5, 5 Gray), respectively (2.26, 1.60 kg/ m2).
In this paper, we study the Gamma function, and the representation of a complex variable, using either sequential or appropriate integration ,and its application in solving certain types of integral equations , and their relationship to the Riemann- Zeta function, and used to solve the contour integration ,and to find the integration of Hankel’s contour integral according to Bessel function for integer n.
This work was conducted to study the effect of two levels (50 and 75%) of
pruning on flowering (number of clusters, number of flowers, diameter of
flowers, flower-stem length) of three cultivars (Emile Mouillère - Nikko Blue -
Pia) of Hydrangea ma
crophylla. Pruning was done on the shrubs of four years
old in addition to a control without pruning. Results indicated that there were
differences among cultivars in response to the proportion of pruning. Emile
Mouillère, a cultivar with white flowers, the results showed an increase in the
proportion of pruning was associated with a reduction the number of fully
developed inflorescences per plant compared to control. For Nikko Blue, a
cultivar with blue flowers, the results showed that level (75%) was the best in
all studied indicators while for Pia, a cultivar with deep pink flowers, the
results showed that pruning with 50% level was the best in all productivity
indicators.
Orange fruits are characterized at harvesting with physical and sensory
properties determine consumer acceptance and in order to identify these
characteristics and vulnerability storage and irradiation conditions, Valancia
orange fruits were subje
cted to gamma irradiation at doses of 0.0, 0.5, 1.0, and
1.5 kGy using gamma 60Co irradiator facility. Fruits were kept in a refrigerator
for 18 weeks. Results indicated that physical and sensory properties of Valencia
orange fruits were affected by storage time and irradiation. The overall color
differences were increased and the firmness of fruits and skin were decreased.
The used doses of gamma irradiation increased the overall color differences of
fruit skin. Whereas the fruit firmness, and the sensory properties (aroma,
color, test and firmness) of irradiated Valencia orange fruits were decreased.
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