Gross chromosome rearrangements are occurring in an accession of the grass Lolium rigidum
Gross chromosome rearrangements are occurring in an accession of the grass Lolium rigidum
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DOI：
10.1023/a:1012499303514
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发表时间：
2004
影响因子：
2.6
通讯作者：
H. Thomas;J. Harper;W. Morgan
中科院分区：
文献类型：
--
作者：
H. Thomas;J. Harper;W. Morgan
对8个黑麦草品种根尖分生组织有丝分裂时的染色体结构进行了分析。FISH显示rDNA位点的位置发生了变化，表明存在广泛的染色体重排；实际上，没有两种基因类型是相同的。在一种基因型中，单个根尖内的细胞之间存在差异。RDNA位置的改变似乎反映了染色体易位，减数分裂中期I的四价体的存在证实了这一点。本文还讨论了这种异常程度的染色体不稳定的可能机制。
Chromosome structure was analysed at mitosis in root tip meristems of eight genotypes ofLolium rigidum. FISH revealed changed positions in the rDNA sites indicating extensive chromosome rearrangements; indeed no two genotypes were the same. In one genotype, there were differences between cells within individual root tips. The changed positions of the rDNA sites appear to be reflections of chromosome translocations and this was confirmed by the presence of quadrivalents at metaphase I of meiosis. Possible mechanisms are discussed for this exceptional level of chromosome instability.