Breaking free: The genomics of allopolyploidy-facilitated niche expansion in white clover
Article
Article Title | Breaking free: The genomics of allopolyploidy-facilitated niche expansion in white clover |
---|---|
ERA Journal ID | 2274 |
Article Category | Article |
Authors | Griffiths, Andrew G., Moraga, Roger, Tausen, Marni, Gupta, Vikas, Bilton, Timothy P., Campbell, Matthew A., Ashby, Rachael, Nagy, Istvan, Khan, Anar, Larking, Anna, Anderson, Craig, Franzmayr, Benjamin, Hancock Kerry, Scott, Alicia, Ellison,Nick W., Cox, Murray P., Asp, Torben, Mailund, Thomas, Schierup, Mikkel H. and Andersen, Stig Uggerhøj |
Journal Title | The Plant Cell |
Journal Citation | 31 (7), pp. 1466-1487 |
Number of Pages | 22 |
Year | 2019 |
Place of Publication | United States |
ISSN | 1040-4651 |
1532-298X | |
Digital Object Identifier (DOI) | https://doi.org/10.1105/tpc.18.00606 |
Web Address (URL) | https://academic.oup.com/plcell/article/31/7/1466/5985684 |
Abstract | The merging of distinct genomes, allopolyploidization, is a widespread phenomenon in plants. It generates adaptive potential through increased genetic diversity, but examples demonstrating its exploitation remain scarce. White clover (Trifolium repens) is a ubiquitous temperate allotetraploid forage crop derived from two European diploid progenitors confined to extreme coastal or alpine habitats. We sequenced and assembled the genomes and transcriptomes of this species complex to gain insight into the genesis of white clover and the consequences of allopolyploidization. Based on these data, we estimate that white clover originated;15,000 to 28,000 years ago during the last glaciation when alpine and coastal progenitors were likely colocated in glacial refugia. We found evidence of progenitor diversity carryover through multiple hybridization events and show that the progenitor subgenomes have retained integrity and gene expression activity as they traveled within white clover from their original confined habitats to a global presence. At the transcriptional level, we observed remarkably stable subgenome expression ratios across tissues. Among the few genes that show tissue-specific switching between homeologous gene copies, we found flavonoid biosynthesis genes strongly overrepresented, suggesting an adaptive role of some allopolyploidy-associated transcriptional changes. Our results highlight white clover as an example of allopolyploidy-facilitated niche expansion, where two progenitor genomes, adapted and confined to disparate and highly specialized habitats, expanded to a ubiquitous global presence after glaciation-associated allopolyploidization. |
Keywords | White Clover; genomes; allopolyploidization |
ANZSRC Field of Research 2020 | 310803. Plant cell and molecular biology |
PubMed ID | 31023841 |
Funder | AgResearch |
Byline Affiliations | AgResearch, New Zealand |
Aarhus University, Denmark | |
Massey University, New Zealand |
https://research.usq.edu.au/item/w3v53/breaking-free-the-genomics-of-allopolyploidy-facilitated-niche-expansion-in-white-clover
Download files
25
total views31
total downloads2
views this month1
downloads this month