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No.30 (1983/11) >

 
Title :Sequoiadendron giganteum の染色体に関する研究(林学科)
Title alternative :The chromosomal study of Sequoiadendron giganteum (LINDL.) BUCH. (Department of Forestry)
Authors :馬場, 繁幸
Authors alternative :Baba, Shigeyuki
Issue Date :19-Nov-1983
Abstract :スギ科の細胞分類学的研究の一環として, Sequoiadendron giganteumの染色体を観察した。体細胞染色体数は2n=22であり, 10対のm型, 1対のsm型染色体であった。sm型染色体は, 長さの順に配列すると第IX染色体であった。最短染色体の動原体に近い中央部分は, 特徴的な性質を示し, 前中期あるいは中期の初めでは, 長くくびれた不染部分といくつかの染色されるか, わずかに染色される小粒として観察された。中期の終りあるいは後中期では, この部分は短縮しており, 不染部分と染色されるか, わずかに染色される1つの小粒となっていた。この特徴的な中央部分は, Ag-I法で濃染することから, NORとして機能していることがわかり, NORと核小体の数は一致していた。
Chromosomes of Sequoiadendron giganteum were studied with the following results : 1. Chromosome number of somatic cell was 2n=22,and ten pairs were m-types, centromere located at median region, and one pair was sm-type, centromere located at submedian region. 2. The smallest pair had specific structure shown at proximal region near centromere. This region shown was weakly stained or partially stained by the Feulgen method. In this region, there were a few small dots at prophase and early metaphase, and one stained dot at late metaphase and meta-anaphase. The region couldn't be distinguished from the centromere clearly. 3. The proximal region of the smallest pair was stained darker than others by using the modificated Ag-I method. It was recognized that nucleolar organizing region (NOR) was located at this region. Number of nucleolus at resting stage was two at the maximum, and corresponded to the number of NOR.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4014
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.30 p.615 -620
Appears in Collections:No.30 (1983/11)

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