Genome‐wide selection footprints and deleterious variations in young Asian allotetraploid rapeseed
| Autor: | Yongji Huang, Longjiang Fan, Lingfeng Mao, Jun Zou, Meihong Chen, Ruiyuan Li, Jie Qiu, Lei Shi, Chu-Yu Ye, Qian-Hao Zhu, Kai Wang, Jinling Meng, Zhesi He, Graham J.W. King, Dongya Wu, Lei Jia, Dandan Hu, Ian Bancroft, Enhui Shen, Yifei Shen, Meng Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Genome evolution food.ingredient Rapeseed Asia introgression Introgression Plant Science Biology Selective breeding 01 natural sciences Genome 03 medical and health sciences food Canola deleterious variations Research Articles Local adaptation allopolyploid 2. Zero hunger Brassica napus Brassica rapa food and beverages selection footprints Genetic load Europe Tetraploidy Plant Breeding 030104 developmental biology Phenotype Evolutionary biology Hybridization Genetic Agronomy and Crop Science Genome Plant 010606 plant biology & botany Biotechnology Research Article Asian rapeseed |
| Zdroj: | Plant Biotechnology Journal |
| ISSN: | 1467-7652 1467-7644 |
| Popis: | Summary Brassica napus (AACC, 2n = 38) is an important oilseed crop grown worldwide. However, little is known about the population evolution of this species, the genomic difference between its major genetic groups, such as European and Asian rapeseed, and the impacts of historical large‐scale introgression events on this young tetraploid. In this study, we reported the de novo assembly of the genome sequences of an Asian rapeseed (B. napus), Ningyou 7, and its four progenitors and compared these genomes with other available genomic data from diverse European and Asian cultivars. Our results showed that Asian rapeseed originally derived from European rapeseed but subsequently significantly diverged, with rapid genome differentiation after hybridization and intensive local selective breeding. The first historical introgression of B. rapa dramatically broadened the allelic pool but decreased the deleterious variations of Asian rapeseed. The second historical introgression of the double‐low traits of European rapeseed (canola) has reshaped Asian rapeseed into two groups (double‐low and double‐high), accompanied by an increase in genetic load in the double‐low group. This study demonstrates distinctive genomic footprints and deleterious SNP (single nucleotide polymorphism) variants for local adaptation by recent intra‐ and interspecies introgression events and provides novel insights for understanding the rapid genome evolution of a young allopolyploid crop. |
| Databáze: | OpenAIRE |
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