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Plastome evolution and phylogenomics of Impatiens (Balsaminaceae)

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Abstract

Main conclusion

This study reported seven new plastomes from Impatiens and observed three highly variable regions for phylogeny and DNA barcoding, which resolved the relationships among sections of subgenus Impatiens.

Abstract

Impatiens L. (Balsaminaceae, Ericales) is one of the largest and most diverse genera of angiosperms, widely known for its taxonomic difficulty. In this study, we reevaluated the infrageneric relationships within the genus Impatiens, using complete plastome sequence data. Seven complete plastomes of Impatiens (representing 6 species) were newly sequenced and characterized along with 20 previously published plastomes of other Impatiens species, plus 2 plastomes of outgroups (Hydrocera triflora, Balsaminaceae; Marcgravia coriacea, Marcgraviaceae). The total size of these 29 plastomes ranged from 151,538 bp to 152,917 bp, except 2 samples of Impatiens morsei, which exhibited a shorter length and lost some genes encoding NADH dehydrogenase subunits. Moreover, the number of simple sequence repeats (SSRs) ranged from 51 to 113, and the number of long repeats from 17 to 26. In addition, three highly variable regions were identified (trnG-GCC (The previous one), ndhF–rpl32–trnL-UGA–ccsA, and ycf1). Our phylogenomic analysis based on 80 plastome-derived protein-coding genes strongly supported the monophyly of Impatiens and its two subgenera (Clavicarpa and Impatiens), and fully resolved relationships among the six (out of seven) sampled sections of subgenus Impatiens. Overall, the plastome DNA markers and phylogenetic results reported in this study will facilitate future identification, taxonomic and DNA barcoding studies in Impatiens as well as evolutionary studies in Balsaminaceae.

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Data availability

The 7 plastome sequence data generated in this study are available in GenBank of the National Center for Biotechnology Information (NCBI) (https://www.ncbi.nlm.nih.gov/nuccore) under the access numbers: ON186542, OP022554–OP022559.

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Acknowledgements

We thank Dr. Zhe-Chen Qi, Yu Feng, Rui-Sen Lu, Mr. Zi-Han Liu and Hai-Lei Zheng for helping with the fieldwork. This research was supported by the National Natural Science Foundation of China (Grant No. 31970225).

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Correspondence to Pan Li.

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Communicated by Anastasios Melis.

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Supplementary file1 (RAR 15892 KB)

425_2023_4078_MOESM2_ESM.rar

Supplementary file2 Summary of Impatiens sampling information and Illumina sequencing reports. Long repeats identified in the 27 Impatiens plastomes. Simple sequence repeats (SSRs) identified in the 27 Impatiens plastomes. The relative synonymous codon usage (RSCU) and total number of the codons of 27 Impatiens plastomes, plus plastomes. The nucleotide diversity (Pi) values of 27 Impatiens plastomes calculated by the sliding window method in DnaSP with a step size of 200 bp and a window length of 800 bp. (RAR 26 KB)

425_2023_4078_MOESM3_ESM.rar

Supplementary file3 MAUVE multiple alignment of 27 Impatiens plastomes, with Hydrocera triflora (Balsaminaceae) and Marcgravia coriacea (Marcgraviaceae) as outgroups. Analysis of the expansion and contraction of inverted repeat (IR) regions in 27 Impatiens plastomes with Hydrocera triflora (Balsaminaceae) and Marcgravia coriacea (Marcgraviaceae) as outgroups. The numbers next to each gene indicate the distance (in bp) to the boundary of particular regions (LSC, large single-copy; SSC, small single-copy; IR, inverted repeats; see vertical lines) or the length of these genes (in bp). Maximum Likelihood (ML) tree of Impatiens based on whole plastomes. The bootstrap support value (BS) of branches without labels is 100%. Bayesian Inference (BI) tree of Impatiens based on the highly variable ycf1 region. The topology of the Maximum Likelihood (ML) tree is the same. The bootstrap support (BS) and posterior probability (PP) values of branches without labels are 100% and 1.0, respectively. Bayesian Inference (BI) tree of Impatiens based on the highly variable ndhF–rpl32–trnL-UGAccsA region. The topology of the Maximum Likelihood (ML) tree is the same. The bootstrap support (BS) and posterior probability (PP) values of branches without labels are 100% or 1.0, respectively. Maximum Likelihood (ML) tree of Impatiens based on the highly variable trnG-GCC region. The bootstrap support (BS) value of branches without labels is 100%. Bayesian Inference (BI) tree of Impatiens base on highly variable region trnG-GCC. The posterior probability (PP) value of branches without labels is 1.0. (RAR 18582 KB)

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Qiu, H., Zhang, ZH., Wang, MZ. et al. Plastome evolution and phylogenomics of Impatiens (Balsaminaceae). Planta 257, 45 (2023). https://doi.org/10.1007/s00425-023-04078-3

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