Genes derived from ancient polyploidy have higher genetic diversity and are associated with domestication in Brassica rapa
| Autor: | Chenlu Di, Xinshuai Qi, Michael T.W. McKibben, Michael S. Barker, Tara E. Hall, J. Chris Pires, Hong An, Gavin C. Conant, Yue Hao, Paul D. Blischak |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Candidate gene Physiology Genomics Plant Science Biology 010603 evolutionary biology 01 natural sciences Genome Domestication Polyploidy 03 medical and health sciences Polyploid Genetic variation Brassica rapa Phylogeny 030304 developmental biology 2. Zero hunger 0303 health sciences Genetic diversity fungi food and beverages Evolutionary biology Ploidy Genome Plant |
| Zdroj: | The New phytologistReferences. 230(1) |
| ISSN: | 1469-8137 |
| Popis: | SummaryMany crops are polyploid or have a polyploid ancestry. Recent phylogenetic analyses have found that polyploidy often preceded the domestication of crop plants. One explanation for this observation is that increased genetic diversity following polyploidy may have been important during the strong artificial selection that occurs during domestication.To test the connection between domestication and polyploidy, we identified and examined candidate genes associated with the domestication of the diverse crop varieties ofBrassica rapa. Like all “diploid” flowering plants,B. rapahas a diploidized paleopolyploid genome and experienced many rounds of whole genome duplication (WGD). We analyzed transcriptome data of more than 100 cultivatedB. rapaaccessions.Using a combination of approaches, we identified more than 3,000 candidate genes associated with the domestication of four majorB. rapacrop varieties. Consistent with our expectation, we found that the candidate genes were significantly enriched with genes derived from the Brassiceae mesohexaploidy. We also observed that paleologs were significantly more diverse than non-paleologs.Our analyses find evidence for that genetic diversity derived from ancient polyploidy played a key role in the domestication ofB. rapaand provide support for its importance in the success of modern agriculture. |
| Databáze: | OpenAIRE |
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