{"title":"Evolutionary genetics of wheat mitochondrial genomes","authors":"Hui-Lin Hu , Fan Zhang , Pei Wang , Fu-Hao Lu","doi":"10.1016/j.cj.2023.09.011","DOIUrl":null,"url":null,"abstract":"<div><p>The <em>Triticum-Aegilops</em> complex provides ideal models for the study of polyploidization, and mitochondrial genomes (mtDNA) can be used to trace cytoplasmic inheritance and energy production following polyploidization. In this study, gapless mitochondrial genomes for 19 accessions of five <em>Triticum</em> or <em>Aegilops</em> species were assembled. Comparative genomics confirmed that the BB-genome progenitor donated mtDNA to tetraploid <em>T. turgidum</em> (genome formula AABB), and that this mtDNA was then passed on to the hexaploid <em>T. aestivum</em> (AABBDD). <em>T urartu</em> (AA) was the paternal parent of <em>T. timopheevii</em> (AAGG), and an earlier <em>Ae. tauschii</em> (DD) was the maternal parent of <em>Ae. cylindrica</em> (CCDD). Genic sequences were highly conserved within species, but frequent rearrangements and nuclear or chloroplast DNA insertions occurred during speciation. Four highly variable mitochondrial genes (<em>atp6</em>, <em>cob</em>, <em>nad6</em>, and <em>nad9</em>) were established as marker genes for <em>Triticum</em> and <em>Aegilops</em> species identification. The BB/GG-specific <em>atp6</em> and <em>cob</em> genes, which were imported from the nuclear genome, could facilitate identification of their diploid progenitors. Genic haplotypes and repeat-sequence patterns indicated that BB was much closer to GG than to <em>Ae. speltoides</em> (SS). These findings provide novel insights into the polyploid evolution of the <em>Triticum/Aegilops</em> complex from the perspective of mtDNA, advancing understanding of energy supply and adaptation in wheat species.</p></div>","PeriodicalId":10790,"journal":{"name":"Crop Journal","volume":null,"pages":null},"PeriodicalIF":6.0000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2214514123001423/pdfft?md5=f23783a3e96152039a5a046b9edcdc51&pid=1-s2.0-S2214514123001423-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crop Journal","FirstCategoryId":"91","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214514123001423","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}
引用次数: 0
Abstract
The Triticum-Aegilops complex provides ideal models for the study of polyploidization, and mitochondrial genomes (mtDNA) can be used to trace cytoplasmic inheritance and energy production following polyploidization. In this study, gapless mitochondrial genomes for 19 accessions of five Triticum or Aegilops species were assembled. Comparative genomics confirmed that the BB-genome progenitor donated mtDNA to tetraploid T. turgidum (genome formula AABB), and that this mtDNA was then passed on to the hexaploid T. aestivum (AABBDD). T urartu (AA) was the paternal parent of T. timopheevii (AAGG), and an earlier Ae. tauschii (DD) was the maternal parent of Ae. cylindrica (CCDD). Genic sequences were highly conserved within species, but frequent rearrangements and nuclear or chloroplast DNA insertions occurred during speciation. Four highly variable mitochondrial genes (atp6, cob, nad6, and nad9) were established as marker genes for Triticum and Aegilops species identification. The BB/GG-specific atp6 and cob genes, which were imported from the nuclear genome, could facilitate identification of their diploid progenitors. Genic haplotypes and repeat-sequence patterns indicated that BB was much closer to GG than to Ae. speltoides (SS). These findings provide novel insights into the polyploid evolution of the Triticum/Aegilops complex from the perspective of mtDNA, advancing understanding of energy supply and adaptation in wheat species.
Crop JournalAgricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
9.90
自引率
3.00%
发文量
638
审稿时长
41 days
期刊介绍:
The major aims of The Crop Journal are to report recent progresses in crop sciences including crop genetics, breeding, agronomy, crop physiology, germplasm resources, grain chemistry, grain storage and processing, crop management practices, crop biotechnology, and biomathematics.
The regular columns of the journal are Original Research Articles, Reviews, and Research Notes. The strict peer-review procedure will guarantee the academic level and raise the reputation of the journal. The readership of the journal is for crop science researchers, students of agricultural colleges and universities, and persons with similar academic levels.