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20 results for “Cassiinae”
Data from: Feasibility of nuclear ribosomal region ITS1 over ITS2 in barcoding taxonomically challenging genera of subtribe Cassiinae (Fabaceae)
Premise of the Study The internal transcribed spacer (ITS) region is situated between 18S and 26S in a polycistronic rRNA precursor transcript. It had been proved to be the most commonly sequenced region across plant species to resolve phylogenetic relationships ranging from shallow to deep taxonomic levels. Despite several taxonomical revisions in Cassiinae, a stable phylogeny remains elusive at the molecular level, particularly concerning the delineation of species in the genera Cassia, Senna and Chamaecrista. This study addresses the comparative potential of ITS datasets (ITS1, ITS2 and concatenated) in resolving the underlying morphological disparity in the highly complex genera, to assess their discriminatory power as potential barcode candidates in Cassiinae. Methodology A combination of experimental data and an in-silico approach based on threshold genetic distances, sequence similarity based and hierarchical tree-based methods was performed to decipher the discriminating power of ITS datasets on 18 different species of Cassiinae complex. Lab-generated sequences were compared against those available in the GenBank using BLAST and were aligned through MUSCLE 3.8.31 and analysed in PAUP 4.0 and BEAST1.8 using parsimony ratchet, maximum likelihood and Bayesian inference (BI) methods of gene and species tree reconciliation with bootstrapping. DNA barcoding gap was realized based on the Kimura two-parameter distance model (K2P) in TaxonDNA and MEGA. Principal Findings Based on the K2P distance, significant divergences between the inter- and intra-specific genetic distances were observed, while the presence of a DNA barcoding gap was obvious. The ITS1 region efficiently identified 81.63% and 90% of species using TaxonDNA and BI methods, respectively. The PWG-distance method based on simple pairwise matching indicated the significance of ITS1 whereby highest number of variable (210) and informative sites (206) were obtained. The BI tree-based methods outperformed the similarity-based methods producing well-resolved phylogenetic trees with many nodes well supported by bootstrap analyses. Conclusion The reticulated phylogenetic hypothesis using the ITS1 region mainly supported the relationship between the species of Cassiinae established by traditional morphological methods. The ITS1 region showed a higher discrimination power and desirable characteristics as compared to ITS2 and ITS1 + 2, thereby concluding to be the locus of choice. Considering the complexity of the group and the underlying biological ambiguities, the results presented here are encouraging for developing DNA barcoding as a useful tool for resolving taxonomical challenges in corroboration with morphological framework.
Data from: Feasibility of nuclear ribosomal region ITS1 over ITS2 in barcoding taxonomically challenging genera of subtribe Cassiinae (Fabaceae)
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FIG. 15 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 15. Known distribution of Chamaecrista plumosa var. plumosa (O) and C. plumosa var. erecta (-) in southern Africa.
FIG. 10 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 10. Morphology of Chamaecrista gordon-grayei. A1–A5. Petals. B. Ovary, densely hairy. C1–C3. Stamens, with anthers in three series. Voucher: Muller & Giess 554 (WIND). Scale bars = 1 mm.
FIG. 11 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 11. Known distribution of Chamaecrista gordon-grayei subsp. gordongrayei (-) and Chamaecrista gordon-grayei subsp. longipedicellata (O) in southern Africa.
FIG. 12 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 12. Morphology of Chamaecrista grandiglandulata. A1–A5. Petals. B. Ovary, densely hairy. C1–C3. Stamens, with anthers in three series. Voucher:
FIG. 3 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 3. Extrafloral nectaries of Chamaecrista species. A. C. mimosoides, sessile, circular or circular-elliptic. B. C. capensis var. capensis, circular, sub-sessile or attached on small stalk. C. C. biensis, circular, concave, sub-sessile or raised on small stalk. D. C. comosa subsp. capriconia, elliptic, sessile, spreading over the petiole. E. C. comosa subsp. comosa, sessile, slightly sunken in petiole. F. C. grandiglandulata, large, sessile, elliptic, overlapping the sides of petiole. G. C. gordon-grayei subsp. longipedicellata, sub-sessile to sessile, circular. H. C. falcata, extrafloral nectaries, long stalked, concave on top. Vouchers: A. Burtt & Hilliard 3215 (NU). B. Walker 119 (PRE). C. Phelan 1120 (PRE). D. Burger 292 (PRE). E. Arnold 792 (NU). F. Ward 1219 (NH). G. De Winter and Wiss 4423 (PRE). H. Ward 2439 (PRE). Scale bars = 5 mm).
FIG. 6 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 6. Distribution of Chamaecrista capensis var. capensis (-) and Chamaecrista capensis var. flavescens (O) in southern Africa.
FIG. 2 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 2. Variation in size, shape and number of leaflets of the Chamaecrista species. A. C. absus showing a leaf with only two leaflets. B. C. comosa subsp. comosa showing a large leaf bearing wide leaflets. C. C. stricta showing a leaf with narrow leaflets. D, F. C. capensis var. capensis and C. capensis var. flavescens showing short leaves bearing wide linear to linear oblong leaflets. E. C. plumosa var. erecta showing a leaf with leaflets that are obliquely linear, often with white hairs on the margins. G. C. grandiglandulata showing a leaf with multiple small leaflets. Vouchers: A. Coeteer 18 (NBG). B. Nemando and Musandiwa 22 (NBG). C. Brenan 14186 (NBG). D. Nemando and Musandiwa 42 (NBG). E Musandiwa 18 (NBG). F Nemando and Musandiwa 19 (NBG). G. Brenan 14218 (NBG). Scale bars = 1 cm.
FIG. 1 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 1. General morphology of Chamaecrista. A. Habit of C. mimosoides showing a low-growing growth form. B. Habit of C. capensis var. flavescens showing a large flower. C. Habit of C. grandiglandulata branching in the upper half, showing short pedicels and small pale flowers. D. Habit of C. comosa subsp. comosa showing broad leaflets, 2–5 mm wide. E. Habit of C. biensis showing a prostrate or decumbent growth form and small flowers. F. Habit of C. stricta, growth form and small flowers. G. Habit of C. plumosa var. erecta. Photographs A–D, G taken by Liada Musandiwa, E–F taken by Anthony Magee.
Linked collectors and determiners for: A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa.
Natural history specimen data linked to collectors and determiners held within, "A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/aca4cc44-7970-4214-8100-97fa3c87eeb6">https://bionomia.net/dataset/aca4cc44-7970-4214-8100-97fa3c87eeb6</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/aca4cc44-7970-4214-8100-97fa3c87eeb6">https://gbif.org/dataset/aca4cc44-7970-4214-8100-97fa3c87eeb6</a>. Formatted as a Frictionless Data package.
FIG. 16 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 16. Known distribution of Chamaecrista stricta in southern Africa.
FIG. 9 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 9. Known distribution of Chamaecrista falcinella var. parviflora in southern Africa.
FIG. 8 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 8. Known distribution of Chamaecrista falcata in southern Africa.
FIG. 5 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 5. Known distribution of Chamaecrista biensis in southern Africa.
FIG. 4 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 4. Known distribution of Chameacrista absus in southern Africa.
FIG. 7 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 7. Known distribution of Chamaecrista comosa subsp. comosa (-) and Chamaecrista comosa subsp. capriconia (O) in southern Africa.
FIG. 14 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 14. Known distribution of Chamaecrista mimosoides in southern Africa.
FIG. 13 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
FIG. 13. Distribution of Chamaecrista grandiglandulata in southern Africa.
Schorn 33 in A Taxonomic Revision of Chamaecrista (Caesalpinioideae, Cassieae, Cassiinae) in Southern Africa
Schorn 33 (NU). Scale bars = 1 mm.
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