The genome origin and evolution of hexaploid Triticum crassum and Triticum syriacum determined from variation in repeated nucleotide sequences
The genome origin and evolution of hexaploid Triticum crassum and Triticum syriacum determined from variation in repeated nucleotide sequences
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从重复核苷酸序列的变异确定六倍体小麦和叙利亚小麦的基因组起源和进化
作者：
Hong;J. Dvorak
六倍体小麦。（同：Aegilops crassa Boiss.）和Triticum syriacum Bowden[同：Aegilops crassa Boiss.]变体巴勒斯坦8，埃基洛普·瓦维洛夫（朱克）陈。是T. crassum复合体的成员。先前的研究表明，他们有T. tauschii （Coss.）的D基因组。Schmalh。但这些物种的其他基因组来源仍不确定。在本研究中，27个重复核苷酸序列和5S rRNA位点的变异被用来确定这些六倍体物种的基因组起源。该研究表明，这两个六倍体物种共享两对基因组，这两对基因组由一个共同的祖先四倍体贡献，基因组公式为DcDcXX。结论认为，Dc基因组是由古代小麦贡献的，X基因组是由一个灭绝物种贡献的，该物种可能是整个小麦属（Triticum L. sensu Bowden）的祖先。六倍体棘球绦虫的第三个基因组与棘球绦虫的D基因组几乎完全相同。
Hexaploid Triticum crassum Aitch &Hemsl. (syn. Aegilops crassa Boiss.) and Triticum syriacum Bowden [syn. Aegilops crassa Boiss. var. palaestina Eig, Aegilops vavilovii (Zhuk.) Chen.] are members of the T. crassum complex. Previous studies suggested that they have the D genomes of T. tauschii (Coss.) Schmalh., but the sources of the other genomes of these species remain uncertain. In the present investigation, variation in 27 repeated nucleotide sequences and the 5S rRNA loci was used to determine the genome origin of these hexaploid species. This study indicated that the two hexaploid species share two pairs of genomes that were contributed by a common ancestral tetraploid with a genome formula DcDcXX. It was concluded that the Dc genome was contributed by ancient T. tauschii and the X genome by an extinct species, possibly a species that was ancestral to the entire genus Triticum L. sensu Bowden except for T. tauschii. The third genome of hexaploid T. crassum is virtually identical to the D genome of ex...