Confirmation of ancient polyploidy in Dahlia (Asteraceae) species using genomic in situ hybridization
Confirmation of ancient polyploidy in Dahlia (Asteraceae) species using genomic in situ hybridization
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使用基因组原位杂交证实大丽花（菊科）物种的古代多倍体
DOI：
10.1006/anbo.1999.0893
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发表时间：
1999
期刊：
影响因子：
4.2
通讯作者：
B. Murray
中科院分区：
文献类型：
--
作者：
M. Gatt;K. Hammett;B. Murray
大丽花异倍体染色体系列成员间种间杂种的成功产生为研究染色体进化提供了一个独特的机会。使用基因组原位杂交（GISH）在这些杂种中的减数分裂中期I的分析表明，配对发生在亲本基因组之间和内部。这些结果为2n=32的大丽花属物种的异源四倍体起源提供了明确的证据，并表明2n=34和2n=36的物种也是通过异源多倍体产生的。2n=32的物种提出的二价促进机制似乎也存在于2n=34和2n=36的大丽花物种中。
The successful production of interspecific hybrids between members of the dysploid chromosome series inDahlia offers a unique opportunity to investigate chromosome evolution. Analysis of meiotic metaphase I in these hybrids using genomic in situ hybridization (GISH) has shown that pairing occurs both between and within parental genomes. These results have provided clear evidence for the allotetraploid origin of Dahlia species with 2n=32 and suggests that species with 2n=34 and 2n=36 have also arisen via allopolyploidy. A bivalent promoting mechanism proposed for species with 2n=32 also appears to be present in Dahlia species with 2n=34 and 2n=36 .