节节麦5D染色体上随体多态性的一个证据

An Evidence of Satellite Polymorphism in Chromosome 5D of Aegilops tauschii Cosson

５Ｄ染色体是节节麦整个染色体组中唯一的１对随体染色体，其随体位于５Ｄ短臂的末端。对来源于中国的９个不同的节节麦居群的吉姆萨Ｃ带分析表明：同一份节节麦居群内不同植株或不同细胞，这个端部随体在整个有丝分裂前期、中期和间期都很稳定，表现为大小、强弱一致的端部特征带。但是不同节节麦居群间５Ｄ染色体上的这个随体Ｃ带存在多态性。５Ｄ染色体上的随体区域可以作为小麦遗传分析和遗传操作的标记性状。同时本文还对这种多态性与普通小麦５Ｄ染色体短臂上随体的消失的关系作了分析。

C-banding analysis of satellites in 9 accessions of Ae. tauschii native to China was carried out with C-banded miotic interphases, prophases and metaphases. The results showed that the C-banded heterochromatin of satellites of Ae. tauschii did not change in size during the whole miotic stage and no variaton was observed among plants and cells within a accession, while polymorphism in C-banded satellites between different accessions was found. The C-banded heterochromatin of satellites of Ae. tauschii can be used as a marker in genetic research and genetic manipulation. Further discussion is made on the relation between the polymorphism and the satellite loss in common wheat.