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The effects of different aluminium chloride concentrations together with varying calciumchloride concentrations on root growth, cell division and nucleoli in root tip cells of Allium cepa werestudied. The concentrations used for aluminium chloride were 10-4, 10-3 and 10-2 mol/L ; and for calcium chloride were 10-5 , 10-4 , 10-3 and 10-2 mol/L, respectively. The results showed that after thetreatments with 10-2 to 10-3 mol/L Al3+ , root growth was severely inhibited , a large nurnber of thecells with c-mitosis were induced and the nucleolar material was extruded from the nucleus into the cytoplasm. However , the treatments with 10-2 to 10-3 mol/L of Al3+ together with 10-2)to 10-5 mol/LCa2+ suggested that Ca2+ gave the obviously protective effects against Al3+ poisoning in root growth.cell division and nucleoli of the root tip cells in A. cepa. The possible mechanism of these protective effects of Ca2+) is also briefly discussed. 相似文献
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A sensitivity scale for criteria used in cytogenetic monitoring was constructed on the basis of published data and the results
of experiments on exposingZebrina pendula Schirt. plants to radon at various equivalent volume equilibrium activities. It was found that nucleolar activity and suppression
of mitotic activity are the most and the least sensitive parameters in terms of response to stress, respectively. 相似文献
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EffectsofCa ̄(2+)ionsantagonistictoAl ̄(3+)ionspoisoninginrootgrowth,celldivisionandnucleolusinroottipcellsofAlliumcepaLiuDongh... 相似文献
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The effects of different concentrations of cadmium chloride ranging from 0.5 to 20 ppm on the nucleolus in root tip cells of Allium cepa were studied using the silver staining technique. The results indicated that after the treatment with Cd2+,different changes in nucleolar morphology appeared. The nucleolar material was extruded from the nucleus into the cytoplasm,and the nucleoli at mitotic metaphase did not disappear. Apparently,cadmium showed a specific effects on the nucleoli in root tip cells of Allium cepa. The possible mechanism behind this phenomenon is also briefly discussed. 相似文献
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EffectsofCd ̄(2+)onthenucleolusinroottipcellsofAlliumcepaJiangWusheng;LiuDonghua(DepartmentofBiology,TianjinNormalUniversity,T... 相似文献
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重金属对大麦(Hordeum vulgare)毒性的研究 总被引:133,自引:1,他引:133
研究了6种重金属(Hg2+、Cd2+、Pb2+、Ni2+、Cu2+、Zn2+)对大麦幼苗生长及根尖细胞遗传学毒害作用.结果表明,随着重金属浓度的增加和处理时间的延长,大麦种子的萌发率、根生长速率和有丝分裂指数下降.1×10-2mol/L的Hg2+、Cd2+、Pb2+处理24h后完全抑制了细胞分裂,Hg2+、Cd2+和Pb2+诱发的染色体畸变率显著高于Ni2+、Cu2+和Zn2+.用5×10-3—5×10-4mol/L的Hg2+、Cd2+、Pb2+处理24h和Ni2+处理48h后,核仁结构发生分解,形成许多核仁颗粒并进入细胞质中,而Cu2+、Zn2+对核仁结构没有影响.6种重金属对大麦的细胞遗传学毒性顺序为Hg2+>Cd2+>Pb2+>Ni2+>Cu2+>Zn2+.文中还讨论了重金属对植物细胞的毒害机理. 相似文献
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研究了不同浓度铝离子[c(Al3_)=101,10-2,10-3,10-4和平共处0-5mol/L)]对绿豆(PhaseolusradiatusL.)根生长及根尖细胞核仁的影响.结果表明:c(Al3+)在10-3mol/L以上时对根生长和根尖细胞核仁都有着抑制作用.该仁受毒害后.核仁物质外溢细胞质内,严重时核仁物质几乎占据整个细胞质.该现象在分生组织细胞和根冠细胞中都可以观察到. 相似文献
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