تنتج الونكا الوردية rosea Vinca أو roseus Catharanthus العديد من أشباه القلويدات الاندوليـة
مثل الـ ajmalicine ، و هى ذات استعمالات طبية مهمة تمت دراسة العلاقة بين إنتاج الـ ajmalicine
و نقص الأكسجين في وسط المعلقات الخلوية لـ roseus Catharanthus خلال دورة حياة هذه الخلايا،
و كذا معدل النمو بالنسبة للوزن الرطب و الوزن الجاف. بينت النتائج أن نقص الأكسجين لخلايا D C20
أدى إلى تثبيط قوى لتراكم الـajmalicine و ربما مركبات أخرى، كما أن إعادة التهوية لاحقاً لا تـؤدي
إلى زوال هذا التأثير.
فضلاً عن ذلك فإن الـloganin استطاع أن يثير تراكم مادة الـajmalicine في المعلقـات الخلويـة
المعرضة لعوز الأكسجين و بشكل أفضل في خلايا الشاهد.
أما تدخل هرمون BAP فقد أثار و بشكل ملحوظ تراكم مادة الـajmalicine.
The Madagascar periwinkle (Catharanthus roseus) produces numerous
indole alkaloids, several of which have an important pharmaceutical uses such
as ajmalicine. The relationship between hypoxia and ajmalicine production in a
cell medium culture of Catharanthus roseus were investigated during the cycle
of cell culture, as well as the growth in fresh and dry matter. The results show
that the lack of oxygenation in C20D cells provokes a very strong inhibition in
accumulation of the alkaloids and of other possible substances. This can be
explained by the absence of some downstream enzymes involved in the
biosynthesis chain of alkaloids or by the blockage of the upstream terpenes to
the production stage. Reoxygenation did not restore hypoxia effect on the
alkaloid accumulation.
Moreover, the present study showed that the addition of the loganin in the
4th day, in the cell culture medium subjected to hypoxia restored the alkaloid
production.
Also, the results show that the BAP increases the ajmalicine production. The
effect of hypoxia was not shown in the presence of cytokinine. The BAP can
without doubt decrease the effects of the hypoxia and increases the ajmalicine
production.
References used
Berlin J. (1988). Formation of secondary metabolites in plant cells and its impacts on pharmacy. pp. 37-54 In : Y.P.S. Bajaj (ed), Biotechnology in agriculture and forestry, vol. 4, Medicinal and aromatic plants I, Springer, Berlin
De Luca V., Balsevich J., Tyler R.T., Eilert U., Panchuk B.D., and Kurz W.G. (1986). Biosynthesis of indole alkaloids: developmental regulation of the biosynthetic pathway from tabersonine to vindoline in catharanthus roseus. J. Plant Physiol., 147-156
Droual A.M, Maroufi H, Creche J, Chenieux J.C , Rideau M , Hamdi S. (1997). Changes in theAccumulation of Cytosolic Cyclophilin Transcripts in Cultured Periwinkle Cells following Hormonal and Stress Treatments. J. Plant Physiol. Vol.151. pp. 142-150
This investigation was carried out at Tissue Culture Laboratory, Department
of Horticulture, University of Mosul, Iraq during 2012-2014) on Catharanthus
roseus Variety; Nirvana Pink Blush, which is one of the important medicinal
plant, containing
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