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首页> 外文期刊>Journal of genetics >Chromosomal structural changes and microsatellite variations in newly synthesized hexaploid wheat mediated by unreduced gametes
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Chromosomal structural changes and microsatellite variations in newly synthesized hexaploid wheat mediated by unreduced gametes

机译：未还原配子介导的新合成六倍体小麦的染色体结构变化和微卫星变异

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Allohexaploid wheat was derived from interspecific hybridization, followed by spontaneous chromosome doubling. Newly synthesized hexaploid wheat by crossing Triticum turgidum and Aegilops tauschii provides a classical model to understand the mechanisms of allohexaploidization in wheat. However, immediate chromosome level variation and microsatellite level variation of newly synthesized hexaploid wheat have been rarely reported. Here, unreduced gametes were applied to develop synthesized hexaploid wheat, NA0928, population by crossing T. turgidum ssp. dicoccum MY3478 and Ae. tauschii SY41, and further S0-S3 generations of NA0928 were assayed by sequential cytological and microsatellite techniques. We demonstrated that plentiful chromosomal structural changes and microsatellite variations emerged in the early generations of newly synthesized hexaploid wheat population NA0928, including aneuploidy with whole-chromosome loss or gain, aneuploidy with telosome formation, chromosome-specific repeated sequence elimination (indicated by fluorescence in situ hybridization) and microsatellite sequence elimination (indicated by sequencing), and many kinds of variations have not been previously reported. Additionally, we reported a new germplasm, T. turgidum accession MY3478 with excellent unreduced gametes trait, and then succeeded to transfer powdery mildew resistance from Ae. tauschii SY41 to synthesized allohexaploid wheat population NA0928, which would be valuable resistance resources for wheat improvement.
机译：异源六倍体小麦来源于种间杂交，随后是自发染色体倍增。通过将黑麦和黑麦草（Aegilops tauschii）杂交而新合成的六倍体小麦提供了一个经典模型，以了解小麦的异源六倍体化机理。然而，鲜有报道新合成六倍体小麦的立即染色体水平变化和微卫星水平变化。在这里，未交配的配子被用于通过杂交T. turgidum ssp来发育合成的六倍体小麦NA0928。 dicoccum MY3478和Ae。用顺序细胞学和微卫星技术测定了tauschii SY41和NA0928的其他S0-S3代。我们证明了在新合成的六倍体小麦群体NA0928的早期世代中出现了大量的染色体结构变化和微卫星变异，包括具有全染色体丢失或获得的非整倍性，具有端粒形成的非整倍性，特定于染色体的重复序列消除（通过荧光原位显示）杂交）和微卫星序列消除（通过测序表明），并且许多变异尚未在以前报道。此外，我们报道了一种具有优异的未减配配子性状的新种质T. turgidum登录号MY3478，然后成功地从Ae转移了抗白粉病。 tauschii SY41对合成异源六倍体小麦群体NA0928的合成，将为小麦改良提供有价值的抗性资源。

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