Toxicity of triethyllead chloride (TriEL) on cytoplasmic shuttle streaming, structure, growth and migration of the plasmodial slime mold Physarum polycephalum
نویسنده
چکیده
صخلملا Lead is one of the poisonous heavy metals that affects the biotic system. In this research, the toxic effects of different concentrations of triethyllead chloride( TriEL ) was studied on the acellular slime mold Physarum polycephalum cytoplasmic shuttle streaming, growth, structure and migration of Physarum plasmodium. The plasmodium was treated with different concentrations of TriEL ( 10, 20, 30, 40, 50 and 60 μM). The results showed that concentrations of TriEL<10 μM had no obvious effect on the studied parameters. Initial or slight signs of toxicity appeared at Concentrations between 20 50 μM. However, 50 μM TriELwas sublethal. They caused mostly irreversible condensation of the plasmodial strands, blebbing of the plasma membrane, vacuolization of the cytoplasm and elongation of the cytoplasmic shuttle streaming period. 60 μM TriEL was lethal and caused irreversible high blebbing of the plasma membrane, direct and rapid stop of cytoplasmic streaming followed by contraction of the whole plasmodium, strong blebbing of the plasma memmbrane, depigmentation, vacuolization and complete fixation of the cytoplasm (neither growth nor migration occurred on nutrient agar plates). ماظنلا ىلع رثؤت يتلا ةماسلا ةليقثلا رصانعلا نم صاصرلا ربتعي يويحلا . يثلاث نم ةفلتخم زيكارتل ماسلا ريثأتلا ةسارد ثحبلا اذھ يف مت يديرولكلا صاصرلا ليثإ ) TriEl ( يولخلالا يملاھلا رطفلا ىلع مولافيسيلوب مورازيف . بايسنلاا ىلع ريثأتلا ةساردلا تلمشو سلا سوردملا رطفلل فحزلاو بيكرتلا ،ومنلا ،بيترلا يمزلابوتي . مت نم زيكارتب مويدومزلابلا روط ةلماعم TriEl ) 60,50,40,30,20,10 وركيم لوم .( زيكرت نأ جئاتنلا ترھظأ 10 م وركي هل سيل لقأ وأ لوم ةسوردملا رھاوظلا ىلع حضاو ريثأت . نيب زيكارتلا امأ 20 50 م وركي اق ريغ تناكف لوم سكعنم ريغ اضابقنإ تببس اھنأ ثيح ةلت ً ةدايز ،يمزلابلا ءاشغلا يف تاعاقفلا نوكت ،ةيمزلابوتوربلا قورعلل ةرود ةدم يف ةدايزلاو مزلابوتيسلا يف تاغارفلاو تلاصيوحلا مزلابوتيسلا بايسنلاا بيترلا ي . زيكارتلا امأ 60 وركيم ناكف لوم عقفتو فلتب ببست ثيح رطفلل لتاقلا زيكرتلا ءاشغلل سكعنم ريغ لماك ضابقنإ هعبت ،يمزلابوتيسلا بايسنلال رشابم فقوت ،يولخلا يف تاعاقفلا ددع ةدايزو جراخلا ىلإ ةغبصلل راشتناو مويدومزلابلل مزلابوتيسلا . وأ ومنلا لاكشأ نم لكش يأ مويدومزلابلا رھظي ملو ةيئاذغلا يرتب قابطأ ىلع ةكرحلا . © 2009 Jordan Journal of Biological Sciences. All rights reserved
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