Recently, the strawberry germplasm improvement team of Zhengzhou Institute of Pomology, Chinese Academy of Agricultural Sciences, and Shenzhen Institute of Agricultural Genomics jointly released the octaploid strawberry telomere-to-telomere genome, systematically analyzed the structure and genetic differentiation of the octaploid strawberry subgenome, and analyzed the epigenetic evolution mechanism of the subgenome. The results were published in Horticulture Research.
The reporter learned that the study used Hongyan strawberry as a material to assemble octaploid strawberry telomeres to telomere genomes from de novo, and identified a total of 109,320 genes including four subgenomes of ABCD. By constructing a phylogenetic tree, it was found that the B, C, and D subgenomes were the first to be introduced into the octaploid genome, and the A subgenome was the last direct ancestor donor.
The analysis showed that subgenome A had the lowest levels of CG, CHG, and CHH methylation. The biased expression genes of subgenome A were higher than those of other subgenomes, and most of the homologous genes expressed by A biased expression were genosome methylation (GBM). This study provides theoretical and data support for the subsequent development of strawberry gene function mining, resistance molecular breeding and quality improvement.
The research was supported by the National Key R&D Program, the Science and Technology Innovation Project of the Chinese Academy of Agricultural Sciences, and the Major Science and Technology Special Project of Henan Province.