A transcriptomic view of the ability of nascent hexaploid wheat to tolerate aneuploidy
Zeng, Deying | Guan, Jiantao | Luo, Jiangtao | Zhao, Laibin | Li, Yazhou | Chen, Wenshuai | Zhang, Lianquan | Ning, Shunzong | Yuan, Zhongwei | Li, Aili | Zheng, Youliang | Mao, Long | Liu, Dengcai | Hao, Ming
BACKGROUND: In contrast to most animal species, polyploid plant species are quite tolerant of aneuploidy. Here, the global transcriptome of four aneuploid derivatives of a synthetic hexaploid wheat line was acquired, with the goal of characterizing the relationship between gene copy number and transcript abundance. RESULTS: For most of the genes mapped to the chromosome involved in aneuploidy, the abundance of transcripts reflected the gene copy number. Aneuploidy had a greater effect on the strength of transcription of genes mapped to the chromosome present in a noneuploid dose than on that of genes mapped elsewhere in the genome. Overall, changing the copy number of one member of a homeologous set had little effect on the abundance of transcripts generated from the set of homeologs as a whole, consistent with the tolerance of aneuploidy exhibited by allopolyploids, whether in the form of a chromosomal deficit (monosomy) or chromosomal excess (trisomy). CONCLUSIONS: Our findings shed new light on the genetic regulation of homeoallele transcription and contribute to a deeper understanding of allopolyploid genome evolution, with implications for the breeding of polyploid crops.
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