Frequent numerical and structural chromosome changes in early generations of synthetic hexaploid wheat

文献类型： 外文期刊

第一作者： Zhang, Siyu

作者： Zhang, Siyu;Lu, Xueying;Fang, Jiaxin;Wang, Jiaqi;Chen, Xuejun;Chen, Jianyong;Wu, Hao;Qi, Zengjun;Du, Pei;Yang, Yang;Tsujimoto, Hisashi;Chu, Chenggen

作者机构：

关键词： Triticum aestivum; Triticum turgidum; Aegilops tauschii; chromosome evolution; oligonucleotide probe multiplex FISH

期刊名称：GENOME （ 影响因子：2.449； 五年影响因子：2.665 ）

ISSN： 0831-2796

年卷期： 2022 年 65 卷 4 期

页码：

收录情况： SCI

摘要： Modern hexaploid wheat (Triticum aestivum L.; AABBDD) has evolved from a hybrid of tetraploid Coss., DD). Variations in chromosome structure and ploidy have played important roles in wheat evolution. How these variations occur and their role in expanding the genetic diversity of modern wheat remain largely unknown. Synthetic hexaploid wheat (SHW) can be used to investigate chromosome variations that occur during the early generations of existence. SHW lines derived by crossing durum wheat 'Langdon' with 12 Ae. tauschii accessions were analyzed using oligonucleotide probe multiplex fluorescence in situ hybridization (FISH) of metaphase chromosomes and SNP markers. Cluster analysis based on SNP markers categorizes them into three groups. Among 702 plants from the S8 and S9 generations, 415 (59.12%) carried chromosome variations involving all 21 chromosomes, but with different frequencies for each chromosome and sub-genome. Total chromosome variation frequencies varied between lines, but there was no significant difference among the three groups. The non-random chromosome variations in the SHW lines detected in this study may indicate that similar variations occurred in the early stages of wheat polyploidization and played important roles in wheat evolution.

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