دُرِس تأثير فيروس تدهور الحمضيات (التريستيزا) في نمو أشجار البرتقال البلدي و الساتزوما المطعمة على أصل الزفير في حريصون عام 2013، و وُجِد أن الإصابة بالفيروس سببت تشوه الأوراق الحديثة، و ظهور أوراق قميّة على شكل القارب أو الملعقة، و قد كانت هذه الأعراض أكثر وضوحاً في الساتزوما منه في البرتقال البلدي. كما انخفض متوسط مساحة نصل الورقة من 15.58سم2 في أشجار البرتقال البلدي السليمة إلى 11.82 سم2 في الأشجار المصابة أي بنسبة 24.13%. و من 19.64 سم2 في أشجار الساتزوما السليمة إلى 12.38 سم2 في الأشجار المصابة أي بنسبة 36.97%. و بينت النتائج انخفاض متوسط طول النموات الخضرية الحديثة الربيعية و الصيفية و الخريفية من 20.98 سم، 14.62 سم، 12.17 سم في أشجار البرتقال البلدي السليمة إلى 18.75 سم، 12.52سم، 9.32 سم في الأشجار المصابة على التوالي. و من 18.78 سم، 14.56 سم، 10.06 سم في أشجار الساتزوما السليمة إلى 13.78 سم، 9.34 سم، 6.03 سم في الأشجار المصابة على التوالي. بينما لم يكن للفيروس تأثيراً معنوياً في مقدار الزيادة في محيط الساق في كلا الصنفين.
Effect of Citrus trestiza virus (CTV) in Growth of Balady common orange and
Satsuma trees grafted on sour orange Rootstock in Hraisoon during 2013 was studied. The
results showed that of infection by CTV caused deformation of shaped leaves, boat or
spoon-shaped leaves. The symptoms was greater in Satsuma from Balady common orange
trees. Also leaf size average of Balady common orange trees reduced from 15.58 cm2 in
healthy trees to 11.82 cm2 in infection trees as percentage 24.13, and from 19.64 cm2 in
healthy Satsuma trees to 12.38 cm2 in infection trees as percentage 36.97. and length
average of spring, summery and autumnal fresh foliages growths was reduced from 20.98
cm, 14.62 cm, 12.17cm in healthy Balady common orange trees to18.75cm, 12.52cm, 9.32
cm in infection trees respectively. Also it reduced from 18.78 cm, 14.56 cm, 10.06 cm in
healthy Satsuma trees to 13.78 cm, 9.34 cm, 6.03 cm in infection trees respectively, the
CTV had no significant effect on Trunk circumference in both varieties.
References used
ABBAS, M.; KHAN, M.M.; FATIMA, B.; IFTIKHAR, Y.; MUGHAL, S.M.; JASKANI, M.J.; KHAN, I.A. Elimination of Citrus tristeza closterovirus (CTV) and production of certified citrus plants through shoot-tip micrografting. PAK. J. BOT, Vol. 40, N.° 3, 2008, 1301-1312
ABOU KUBAA, R.; DJELOUAH, K.; ADDANTE, R.; JAMAL, M.; D'ONGHIA, A. M. Occurrence, distribution, characterization of Citrus tristeza virus and its vectors in Syria. Journal of plant pathology, vol. 91, N°. 2, 2009, 303- 309
ABOU KUBAA, R.; DJELOUAH, K.; D'ONGHIA, A. M.; JAMAL, M. First Report from Syria of Citrus tristeza virus in Citrus spp. The American Phytopathological Society, N°. 10, 2008, 1468
A survey of infection by Citrus tristeza virus (CTV) was conducted during a visit to 14 citrus orchards in different regions in Tartous governorate in the Syrian Coast during the spring of 2012. We collected a total of /691/ samples of different vari
The study was conducted in 2011 on 6-years-old citrus trees "Washington navel
141". It contained four treatments with three replicates for each treatment. The results
showed that:
The wastewater treatments showed superiority on the control in the
Some factors which affect in vitro propagation of sour orange (Citrus
aurantium. L.) were studied on Murashige and Skoog medium. Medium
containing ١,٠ mg/L ٦-Benzylaminopurine (BA) was satisfactory for shoot
multiplication, Dichlorophenoxyacetic acid (٢،٤-D) was not effective for shoot
proliferation and it enhanced callus formation.
The research was carried out during the years 2010 and 2011. The results showed the
following:
The soil's care operations are carried out in the modern and middle old orange
fields and aren't carried out in the old fields ( more than 30 years).
This study is aimed at studying the effect of using four species of
bacteria Plant Growth Promotion Rhizobacteria (PGPR) Azotobacter
chroococcum, Rhizobium leguminosarum, Bacillus megaterium and
Frateuriaaurantia on the growth, yield and reducing