Chromosomes form into seven groups in hexaploid and tetraploid wheat as a prelude to meiosis
Chromosomes form into seven groups in hexaploid and tetraploid wheat as a prelude to meiosis
复制标题
DOI：
10.1046/j.1365-313x.2003.01853.x
复制
发表时间：
2003-10-01
期刊：
影响因子：
7.2
通讯作者：
Moore, G
中科院分区：
文献类型：
--
作者：
Martinez-Perez, E;Shaw, P;Moore, G
六倍体小麦具有42条来源于其三个祖先基因组的染色体。根据其基因序列的相似性，这21对染色体可以进一步分为7组，每组6条染色体(一对染色体来自三个祖先的基因组)。以前的研究表明，在花药发育过程中，染色体通过着丝粒连接成21对。本研究表明，作为减数分裂的前奏，当端粒开始聚集时，六倍体(和四倍体)小麦的这21对染色体通过着丝粒结合成七组。这导致了多条染色体的联合，然后随着减数分裂的进行，需要解决这些问题。七个染色体簇的形成现在解释了在六倍体(和四倍体)小麦减数分裂的后期阶段偶尔出现多个联合的残余物的原因。重要的是，染色体有机会通过这些多重相互作用被重新利用。随着减数分裂的进行，这种相互作用通过PH1等基因座的作用得到解决，使染色体成为同源对。
Hexaploid wheat possesses 42 chromosomes derived from its three ancestral genomes. The 21 pairs of chromosomes can be further divided into seven groups of six chromosomes (one chromosome pair being derived from each of the three ancestral genomes), based on the similarity of their gene order. Previous studies have revealed that, during anther development, the chromosomes associate in 21 pairs via their centromeres. The present study reveals that, as a prelude to meiosis, these 21 chromosome pairs in hexaploid (and tetraploid) wheat associate via the centromeres into seven groups as the telomeres begin to cluster. This results in the association of multiple chromosomes, which then need to be resolved as meiosis progresses. The formation of the seven chromosome clusters now explains the occasional occurrence of remnants of multiple associations, which have been reported at later stages of meiosis in hexaploid (and tetraploid) wheat. Importantly, the chromosomes have the opportunity to be resorted via these multiple interactions. As meiosis progresses, such interactions are resolved through the action of loci such as Ph1, leaving chromosomes as homologous pairs.