The complete chloroplast genome sequences of three Broussonetia species and comparative analysis within the Moraceae.

Publisher: PeerJ Inc Country of Publication: United States NLM ID: 101603425 Publication Model: eCollection Cited Medium: Print ISSN: 2167-8359 (Print) Linking ISSN: 21678359 NLM ISO Abbreviation: PeerJ

Original Publication: Corte Madera, CA : PeerJ Inc.

Broussonetia*/genetics ; Moraceae*/genetics ; Genome, Chloroplast*/genetics; Humans ; Phylogeny ; Biological Evolution

Background: Species of Broussonetia (family Moraceae) are commonly used to make textiles and high-grade paper. The distribution of Broussonetia papyrifera L. is considered to be related to the spread and location of humans. The complete chloroplast (cp) genomes of B. papyrifera , Broussonetia kazinoki Sieb., and Broussonetia kaempferi Sieb. were analyzed to better understand the status and evolutionary biology of the genus Broussonetia .
Methods: The cp genomes were assembled and characterized using SOAPdenovo2 and DOGMA. Phylogenetic and molecular dating analysis were performed using the concatenated nucleotide sequences of 35 species in the Moraceae family and were based on 66 protein-coding genes (PCGs). An analysis of the sequence divergence (pi) of each PCG among the 35 cp genomes was conducted using DnaSP v6. Codon usage indices were calculated using the CodonW program.
Results: All three cp genomes had the typical land plant quadripartite structure, ranging in size from 160,239 bp to 160,841 bp. The ribosomal protein L22 gene ( RPL22 ) was either incomplete or missing in all three Broussonetia species. Phylogenetic analysis revealed two clades. Clade 1 included Morus and Artocarpus , whereas clade 2 included the other seven genera. Malaisia scandens Lour. was clustered within the genus Broussonetia . The differentiation of Broussonetia was estimated to have taken place 26 million years ago. The PCGs' pi values ranged from 0.0005 to 0.0419, indicating small differences within the Moraceae family. The distribution of most of the genes in the effective number of codons plot (ENc-plot) fell on or near the trend line; the slopes of the trend line of neutrality plots were within the range of 0.0363-0.171. These results will facilitate the identification, taxonomy, and utilization of the Broussonetia species and further the evolutionary studies of the Moraceae family.
Competing Interests: The authors declare there are no competing interests.
(©2022 Yang et al.)

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Keywords: Broussonetia; Chloroplast genome; Comparative analysis; Moraceae; Phylogeny

Date Created: 20221107 Date Completed: 20230123 Latest Revision: 20230124

20231215

PMC9632464

10.7717/peerj.14293

36340196