A chromosome‐level genome of Syringa oblata provides new insights into chromosome formation in Oleaceae and evolutionary history of lilacs

作者：Yi Wang, Limin Lu, Jingrui Li, Huayang Li, Yichen You, Shuying Zang, Yongqing Zhang, Jianfei Ye, Zemin Lv, Zhaoyu Zhang, Yongsheng Qin, Hongling Zhang, Fei Xia, Hui Li, Huijin Zhang, Peige Fan, Lei Shi, Zhenchang Liang, Hongxia Cui · 发表于：The Plant Journal · 年份：2022 · DOI：10.1111/tpj.15858 · 被引用次数：30 · 研究领域：Genomics and Phylogenetic Studies、Genetic diversity and population structure、Plant biochemistry and biosynthesis

Lilacs (Syringa L.), a group of well-known ornamental and aromatic woody plants, have long been used for gardening, essential oils and medicine purposes in East Asia and Europe. The lack of knowledge about the complete genome of Syringa not only hampers effort to better understand its evolutionary history, but also prevents genome-based functional gene mining that can help in the variety improvement and medicine development. Here, a chromosome-level genome of Syringa oblata is presented, which has a size of 1.12 Gb including 53 944 protein coding genes. Synteny analysis revealed that a recent duplication event and parallel evolution of two subgenomes formed the current karyotype. Evolutionary analysis, transcriptomics and metabolic profiling showed that segment and tandem duplications contributed to scent formation in the woody aromatic species. Moreover, phylogenetic analysis indicated that S. oblata shared a common ancestor with Osmanthus fragrans and Olea europaea approximately 27.61 million years ago (Mya). Biogeographic reconstruction based on a resequenced data set of 26 species suggested that Syringa originated in the northern part of East Asia during the Miocene (approximately 14.73 Mya) and that the five Syringa groups initially formed before the Late Miocene (approximately 9.97 Mya). Furthermore, multidirectional dispersals accompanied by gene introgression among Syringa species from Northern China during the Miocene were detected by biogeographic reconstruction. Ta...