Pan-genome Analysis of Plastomes from Lamiales using PGR-TK
This study looks at the genetic material of a large group of flowering plants called Lamiales. It uses a special tool to analyze their chloroplast DNA, finding that most plants are quite similar, but some, like Utricularia and Orobanche, are very different.
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- 1 Plants in this order vary widely, ranging from small herbs to shrubs and trees, and demonstrate a remarkable array of ecological adaptations and specialized traits.
- 2 The Pangenome Research Toolkit (PGR-TK) is a cutting-edge tool that utilizes a minimizer-based approach to significantly improve processing speed .
- 3 The sets with three or more sequences were analyzed using PGR-TK to identify conservation patterns.
- 4 However, a few sequences from Incarvillea and Campsis show some differences and appear as outgroups within the entire family..
Introduction
The Lamiales is a large and diverse order of flowering plants within the asterid clade of eudicots, encompassing approximately 24,000 species . Notable examples include (i) the Lamiaceae family, known for its aromatic oils; (ii) the Oleaceae family, which thrives in Mediterranean climates; (iii) desiccation-tolerant “resurrection plants”; (iv) numerous carnivorous species, such as Utricularia and Genlisea; and (v) parasitic plants from the Orobanchaceae family.
Several economically important plants, such as teak, olive, lavender, jasmine, and many culinary herbs (mint, basil, sage, and rosemary) are members of this order.
Molecular phylogenetic studies of the Lamiales order currently recognize 24-26 families .
Methodology
Refulio-Rodriguez and Olmstead extended the analysis by incorporating seven other gene regions and further refined the phylogeny . Additionally, all plastid sequences were separated at the family level, and PGR-TK analysis was performed on 14 Lamiales families with sufficient data.
Study Design
In this analysis, the PGR-TK profiles were visually inspected for length differences and variations in conservation patterns.
We disregard such local inversions in our analysis.
Results & Findings
Plants in this order vary widely, ranging from small herbs to shrubs and trees, and demonstrate a remarkable array of ecological adaptations and specialized traits. Schäferhoff et al. used three chloroplast regions, namely trnK/matK, trnL-F, and rps16, for members from all families and successfully resolved the relationships among the nine earliest-branching families with strong support .
- Plants in this order vary widely, ranging from small herbs to shrubs and trees, and demonstrate a remarkable array of ecological adaptations and specialized traits.
- Schäferhoff et al. used three chloroplast regions, namely trnK/matK, trnL-F, and rps16, for members from all families and successfully resolved the relationships among the nine earliest-branching.
- This progress now makes it possible to compare entire genomes instead of different gene regions.
- The Pangenome Research Toolkit (PGR-TK) is a cutting-edge tool that utilizes a minimizer-based approach to significantly improve processing speed .
- The sets with three or more sequences were analyzed using PGR-TK to identify conservation patterns.
Plants in this order vary widely, ranging from small herbs to shrubs and trees, and demonstrate a remarkable array of ecological adaptations and specialized traits.
The Pangenome Research Toolkit (PGR-TK) is a cutting-edge tool that utilizes a minimizer-based approach to significantly improve processing speed .
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Practical Applications
These anomalies may be attributed to structural rearrangements such as inversions in the SSC or other regions. This group may represent a distinct sub-family and warrants further investigation.
Interestingly, Scrophularia diverges into two distinct groups, suggesting possible substructuring within the genus.
Only Erythranthe parviflora grouped with Diplacus, suggesting possible misclassification of the plant.
Observations at the Genus Level
PGR-TK identified conserved segments and evolutionary relationships among plastid sequences. Most genera followed expected patterns, with notable exceptions like Incarvillea, Orobanche, and Utricularia showing divergence.
Observations at the Family Level Lamiaceae
Lamiaceae, the largest family, showed few discrepancies in PGR-TK profiles, with fragmentation noted in the Nepeta genus.
Oleaceae
Oleaceae sequences displayed high similarity with minor length variations. Some sequences diverged, suggesting structural rearrangements, while overall consistency was observed.
Limitations and Cautions
A useful limitation and caution is that this article summarizes the available paper text and extracted evidence; readers should consult the source paper before treating any interpretation as definitive.
The paper’s conclusions may depend on its source selection, definitions, assumptions, and the scope of its analysis, so follow-up reading is important.
Frequently Asked Questions
Extensive research has been undertaken to clarify the interrelationships among these families. The effectiveness of PGR-TK was demonstrated previously , and this study applied it to the 87 genera and 14 families within Lamiales for which complete plastid sequences were available.
Additionally, all plastid sequences were separated at the family level, and PGR-TK analysis was performed on 14 Lamiales families with sufficient data. When such divergent taxa are incorporated into the broader family-level analysis, they contribute significant noise and fragmentation to the overall.
Plants in this order vary widely, ranging from small herbs to shrubs and trees, and demonstrate a remarkable array of ecological adaptations and specialized traits. The Pangenome Research Toolkit (PGR-TK) is a cutting-edge tool that utilizes a minimizer-based approach to significantly improve.
(iii) Acanthus, Lindernia, Jasminum, Elsholtzia, Echinacanthus, Callitriche, Barleria show extensive fragmentation, although the overall quadripartite structure is preserved. Overall, the sequences show a high degree of similarity, with only minor variations in length (Fig. 2 ).
This study looks at the genetic material of a large group of flowering plants called Lamiales. It uses a special tool to analyze their chloroplast DNA, finding that most plants are quite similar, but some, like Utricularia and Orobanche, are very different.
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