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《Acta Biologiae Experimentalis Sinica》 1989-01
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COILING STRUCTURE OF PROPHASE AND PROMETAPHASE CHROMOSOMES IN ALLIUM SATIVUM

Niu Yi-chong,Jiao Ming-da,He Meng-yuan and Hao Shui (Department of Biology,Northeast Normal University,Changchun)  
The coiling structure in chromosomes ofprophase and prometaphase and its dynamicbehaviour during these periods were investi-gated in meristematic cells of root tips ofAllium sativum.The light microscopic observa-tions were made on squashes stained with theFeulgen's method,and the electron microscopicobservations on ultrathin sections which werefixed and stained conventionally. In nuclei that were about to beginmitosis,chromonemata with a diameter of 400nm or so could be observed under the lightmicroscope (Fig.1).These chromonematawere found to start coiling at early prophaseduring which part of the chromonemata be-come coiled progressively while the others re-mained extended (Fig s.2 to 5).The coils ofchromonemata at early prophase measuredabout 1.2 to 1.5 μm in diameter.The furthercoiling of chromonemata at late prophase wasindicated by the phenomena that the diameterof the coils increased to 1.8 to 2.0 μm andthe coiling structures in many domains alongthe chromonemata were arranged quite com-pactly (Figs.6 to 9).However,in some do-mains along the late prophase chromonematathe coiling structures were still less compact.In prometaphase chromosomes,the coilingstructures composed of chromonemata of about600 nm could be seen,the arrangement ofthe coils were much more compact and theirdiameter became as big as 2 to 3 μm (Fig.10).Under the electron microscope,thecoiling structure was observed in the lon-gitudinal section of late prophase chromosomeswhich were in the process of condensation(Fig.11).The coiling structure and thechromonemata of late prophase chromosomeswere about 1.6μm and 400 to 600 nm,res-pectively,in their diameters. The results mentioned above indicate thatthe coiling structure in prophase and prome-taphase chromosomes is spiralized gradually.The higher-order structure of the chromosomeis discussed in this paper.
【Fund】: 国家教委资助的基础研究课题
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1 TAO Wei\ LIU Xiaoling\ ZHAO Yun\ LU Zhigang\ ZHAI Zhonghe (School of Life Science,Peking University,Beijing,100871);Observation of Chromosome Structure in Allium Cepa Cells by Means of Electron Microscopy[J];ACTA SCICENTIARUM NATURALUM UNIVERSITIS PEKINESIS;2000-06
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