Buntarika Nuntha, S. Kikuchi, T. Taychasinpitak, H. Sassa, T. Koba
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引用次数: 2
摘要
虽然富氏托伦虫(2n=2x=18)和巴氏托伦虫(2n=2x=16)的染色体数目不同，但在种间杂交减数分裂过程中，几乎所有亲本染色体都通过种间配对形成二价体。在这里，我们在两个物种和它的6个BC1F1后代之间产生了另一个杂交种(F1 hybrid × T. baillonii)。这些植物的染色体组成以前未被报道:染色体总数为34，与异体四倍体的预期一致，但一些T. fournieri染色体得到了，一些T. baillonii染色体丢失了。具有这些新核型的植株生长良好，表现出不同的形态。本研究表明，种间杂交的两个亲本基因组具有几个可互换的同源染色体。
New karyotypes of an interspecific hybrid of Torenia fournieri and Torenia baillonii and its progenies
Although Torenia fournieri (2n=2x=18) and Torenia baillonii (2n=2x=16) have different chromosome numbers, almost all of the parental chromosomes form bivalents by interspecific pairing during meiosis in interspecific hybrids. Here, we produced another hybrid between the two species and its six BC1F1 progenies (F1 hybrid × T. baillonii). These plants had previously unreported chromosome compositions: the total chromosome number was 34, as expected for allotetraploids, but some T. fournieri chromosomes were gained and some T. baillonii chromosomes were lost. Plants with these new karyotypes grew well and showed different morphologies. This study indicates that two parental genomes in interspecific hybrids share several interchangeable homoeologous chromosomes.
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