Raman Gurusamy, Choi Kyoung-Su, Lee Eun Mi, Morden Clifford W, Shim Hyeonah, Kang Jong-Soo, Yang Tae-Jin, Park SeonJoo
Department of Life Sciences, Yeungnam University, Gyeongsan, Gyeongsan-buk, Republic of Korea.
Plant Research Team, Animal and Plant Research Department, Nakdonggang National Institute of Biological Resources, Sangju, Republic of Korea.
Comput Struct Biotechnol J. 2023 Oct 10;21:5073-5091. doi: 10.1016/j.csbj.2023.10.010. eCollection 2023.
The tribe Hydrangeeae displays a unique, distinctive disjunct distribution encompassing East Asia, North America and Hawaii. Despite its complex trait variations and polyphyletic nature, comprehensive phylogenomic and biogeographical studies on this tribe have been lacking. To address this gap, we sequenced and characterized 28 plastomes of Hydrangeeae. Our study highlights the highly conserved nature of Hydrangeaceae chloroplast (cp) genomes in terms of gene content and arrangement. Notably, synapomorphic characteristics of tandem repeats in the conserved domain of were observed in the , , and sections within the Hydrangeeae tribe. Additionally, we found lower expression of in these sections using structure prediction and quantitative real-time PCR analysis. Phylogenomic analyses revealed the subdivision of the Hydrangeeae tribe into two clades with robust support values. Consistent with polyphyletic relationships, sect. was identified as the basal group in the tribe Hydrangeeae. Our study also provides insights into the phylogenetic relationships of in the Jeju and Ulleung Island populations, suggesting the need for further studies with more samples and molecular data. Divergence time estimation and biogeographical analyses suggested that the common ancestors of the tribe Hydrangeeae likely originated from North America and East Asia during the Paleocene period via the Bering Land Bridge, potentially facilitating migration within the tribe between these regions. In conclusion, this study enhances our understanding of the evolutionary history and biogeography of the tribe Hydrangeeae, shedding light on the dispersal patterns and origins of this intriguing plant group with its unique disjunct distribution.
绣球花族呈现出独特且显著的间断分布，涵盖东亚、北美和夏威夷。尽管其性状变异复杂且具有多系性质，但此前一直缺乏对该族全面的系统基因组学和生物地理学研究。为填补这一空白，我们对绣球花族的28个质体基因组进行了测序和特征分析。我们的研究突出了绣球花科叶绿体（cp）基因组在基因含量和排列方面高度保守的性质。值得注意的是，在绣球花族的 、 和 组中，观察到了 保守结构域中串联重复的共衍征特征。此外，通过结构预测和定量实时PCR分析，我们发现这些组中 的表达较低。系统基因组学分析揭示，绣球花族可细分为两个分支，且支持值很强。与多系关系一致， 组被确定为绣球花族中的基部类群。我们的研究还为济州岛和郁陵岛种群中 的系统发育关系提供了见解，表明需要用更多样本和分子数据进行进一步研究。分歧时间估计和生物地理学分析表明，绣球花族的共同祖先可能在古新世时期通过白令陆桥起源于北美和东亚，这可能促进了该族在这些地区之间的迁移。总之，本研究增进了我们对绣球花族进化历史和生物地理学的理解，揭示了这个具有独特间断分布的迷人植物类群的扩散模式和起源。
