Moss is a phylum in the plant world. It belongs to one of the three main branches of bryophytes (moss, moss, horn moss ). Its origin history can be traced back to 400 million years ago. As an ancient plant group, moss plants are very diverse. Currently, there are more than 7,300 moss species in the world, belonging to 15 orders, 87 families, and more than 300 genera. The deep systematic evolution relationship is still very controversial. The research team of Shenzhen Xianhu Botanical Garden and collaborators used to transcribe data to reconstruct the moss-level skeleton system. On September 8, the relevant results were published online in the internationally renowned journal "Annals of Botany".
Moss plant stone land money. Photo provided by the interviewed unit
In recent years, with the development of high-throughput sequencing technology, plant phylogenetic genomics has achieved rapid development, and transcriptome data has been widely used in plant phylogenetic genomics. The transcriptome is the expression map of the genome, with a large amount of data and high sequencing efficiency. For groups such as moss plants with large genome size variations, using transcriptome data has great advantages. The researchers sampled transcriptome data of 55 moss, covered 14 of the 15 moss, constructed 1480 single-copy nuclear gene matrix, and reconstructed the moss-level system framework for the first time, and obtained a highly supported phylogenetic tree.
analysis results show that the Dow and the nude sac are clustered as one branch, which is the sister group of all other moss species; the saccharomy, the saccharomy, the saccharomy, and the saccharomycephala are clustered into complex foliar branches; the saccharomycephala, the saccharomycephala and the saccharomycephala are clustered into complex foliar branches; the saccharomycephala, the saccharomycephala and the saccharomycephala are clustered into complex foliar branches; the saccharomycephala, the saccharomycephala and the saccharomycephala are then differentiated in sequence. In the analysis results, the saccharomycephala, the saccharomycephala and the saccharomycephala belonging to the saccharomycephala did not form a single line, but existed in the form of a co-linear. For the long-standing controversial system location of furry moss , transcriptome data strongly support it to gather in one branch with furry moss , and then form a sister group relationship with furry moss .
Although the relationship between moss skeleton system has received high support, its deep system relationship still has widespread conflicts between the single nuclear gene . In addition, there is also a conflict signal between the organelles genomic data and the nuclear genomic data, suggesting that moss plants may have ancient hybridization events during the evolution of the process of their genes, and there is incomplete lineage sorting during the evolution of their genes. The previous Thousand Plant Transcriptome Project results suggest that the ancestors of the Leafythiasis may have had a genome-wide replication, and this conclusion is not supported by this study. Moss is a rare large branch among land plants that does not undergo genome-wide replication in their deep evolution. The reason for this phenomenon and the significance behind it deserves further exploration.
The first author of this paper is Dong Shanshan, an associate researcher at the Key Laboratory of South Subtropical Plant Diversity in Xianhu Botanical Garden in Shenzhen, and the corresponding author of is Liu Yang, a researcher. Zhang Li, a researcher at the Xianhu Botanical Garden, Zhang Li, a researcher at the Shenzhen BGI Life Sciences Institute, Yu Jin, and Bernard Goffine, a professor at the University of Connecticut in the United States, jointly completed the work. The research was also supported by the Shenzhen Municipal Urban Management and Law Enforcement Bureau’s Scientific Research Special Fund.
Shenzhen Evening News reporter Yi Xiaohong Intern reporter Wei Yuchen
