Cytogenetic evidence for cryptic structural hybridity causing intraspecific hybrid sterility in Aegilops caudata L..

S. Ohta
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引用次数: 2

Abstract

To elucidate the mechanism causing the intraspecific hybrid sterility in Aegilops caudata, chromosome pairing and segregation at meiosis and fertility were examined in sterile F1 hybrids, a tetraploid derivative induced from one of the sterile hybrids, and their parental lines. The F1 hybrids showed a normal configuration and frequency of chromosome pairing at MI but was completely sterile. At AI, chromosomes consisting of two sister chromatids different in length were observed. The induced tetraploid was shown to be an autotetraploid based on the configuration and frequency of chromosome pairing at MI, and it showed incomplete but obvious restoration of fertility. From the results, it was strongly suggested that the intraspecific hybrid sterility observed in this species is a chromosomal sterility caused by cryptic structural hybridity defined by Stebbins (1945, 1950). However, the differences in chromosomal structure between parental lines are presumably not great enough to cause preferential pairing in the induced tetraploid. Ae. caudata, thus, most probably is considered to be just on the way to speciation due to cryptic chromosomal rearrangements.
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隐性结构杂交导致种内杂交不育的细胞遗传学证据。
为了阐明尾叶黄属植物种内不育的发生机制,对不育F1杂种及其亲本进行了染色体配对、减数分裂分离和育性分析。F1杂交种的染色体形态和配对频率正常,但完全不育。在AI时,观察到由两条长度不同的姐妹染色单体组成的染色体。从染色体配对的结构和频率来看,所诱导的四倍体为同源四倍体,其育性恢复不完全但明显。从结果来看,强烈建议在该物种中观察到的种内杂交不育是由Stebbins(1945, 1950)定义的隐结构杂交引起的染色体不育。然而,亲本系之间的染色体结构差异可能不足以在诱导的四倍体中引起优先配对。Ae。因此,尾尾动物很可能被认为是由于染色体的隐性重排而处于物种形成的过程中。
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