Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): a tale of more than two genera

Paton, Alan; Mwanyambo, Montfort; Govaerts, Rafaël; Smitha, Kokkaraniyil; Suddee, Somran; Phillipson, Peter B.; Wilson, Trevor; Forster, Paul I.; Culham, Alastair

doi:10.3897/phytokeys.129.34988

Cited by 41 publications

(46 citation statements)

References 32 publications

(78 reference statements)

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“…Ocimeae are characterized by declinate stamens lying along the anterior lip of the corolla and synthecous anthers [ 1 , 102 ]. As currently circumscribed, a total of 43 genera and over 1200 species are included in Ocimeae, distributed mainly in the tropics and subtropics [ 1 , 103 , 104 ]. Major centers of diversity include tropical Africa and Madagascar, China and Malaysia, and South America [ 1 , 103 ].…”

Section: Discussionmentioning

confidence: 99%

An updated tribal classification of Lamiaceae based on plastome phylogenomics

et al. 2021

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Background A robust molecular phylogeny is fundamental for developing a stable classification and providing a solid framework to understand patterns of diversification, historical biogeography, and character evolution. As the sixth largest angiosperm family, Lamiaceae, or the mint family, consitutes a major source of aromatic oil, wood, ornamentals, and culinary and medicinal herbs, making it an exceptionally important group ecologically, ethnobotanically, and floristically. The lack of a reliable phylogenetic framework for this family has thus far hindered broad-scale biogeographic studies and our comprehension of diversification. Although significant progress has been made towards clarifying Lamiaceae relationships during the past three decades, the resolution of a phylogenetic backbone at the tribal level has remained one of the greatest challenges due to limited availability of genetic data. Results We performed phylogenetic analyses of Lamiaceae to infer relationships at the tribal level using 79 protein-coding plastid genes from 175 accessions representing 170 taxa, 79 genera, and all 12 subfamilies. Both maximum likelihood and Bayesian analyses yielded a more robust phylogenetic hypothesis relative to previous studies and supported the monophyly of all 12 subfamilies, and a classification for 22 tribes, three of which are newly recognized in this study. As a consequence, we propose an updated phylogenetically informed tribal classification for Lamiaceae that is supplemented with a detailed summary of taxonomic history, generic and species diversity, morphology, synapomorphies, and distribution for each subfamily and tribe. Conclusions Increased taxon sampling conjoined with phylogenetic analyses based on plastome sequences has provided robust support at both deep and shallow nodes and offers new insights into the phylogenetic relationships among tribes and subfamilies of Lamiaceae. This robust phylogenetic backbone of Lamiaceae will serve as a framework for future studies on mint classification, biogeography, character evolution, and diversification. Graphical abstract

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Section: Discussionmentioning

confidence: 99%

An updated tribal classification of Lamiaceae based on plastome phylogenomics

et al. 2021

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“…Building on observations by Kluge and Ting (1978), who reported nocturnal acidification in Plectranthus prostratus Gürke (now Coleus prostratus (Gürke) A.J. Paton et al 2019), Herppich and collaborators studied the occurrence of CAM in several species of what was then considered Plectranthus native to Yemen and southern Africa (Herppich 1996(Herppich , 1997Herppich and Herppich 1996;Herppich et al 1998). Features of CAM were noted in four of seven species.…”

Section: Introductionmentioning

confidence: 97%

“…Spreng. ; Paton et al 2019) is one of the most widely recognised members of the genus Coleus. It is a semi-succulent perennial herb native to southern and eastern Africa that is widely cultivated and naturalised elsewhere in the tropics and subtropics.…”

Section: Introductionmentioning

confidence: 99%

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Constitutive and facultative crassulacean acid metabolism (CAM) in Cuban oregano,

et al. 2020

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Plants exhibiting the water-conserving crassulacean acid metabolism (CAM) photosynthetic pathway provide some of the most intriguing examples of photosynthetic diversity and plasticity. Here, a largely unnoticed facet of CAM-plant photosynthesis is highlighted: the co-occurrence of ontogenetically controlled constitutive and environmentally controlled facultative CAM in a species. Both forms of CAM are displayed in leaves of Coleus amboinicus Lour. (Lamiaceae), a semi-succulent perennial plant with oregano-like flavour that is native to southern and eastern Africa and naturalised elsewhere in the tropics. Under well-watered conditions, leaves assimilate CO2 predominantly by the C3 pathway. They also display low levels of CO2 uptake at night accompanied by small nocturnal increases in leaf tissue acidity. This indicates the presence of weakly expressed constitutive CAM. CAM expression is strongly enhanced in response to drought stress. The drought-enhanced component of CAM is reversible upon rewatering and thus considered to be facultative. In contrast to C. amboinicus, the thin-leaved closely related Coleus scutellarioides (L.) Benth. exhibits net CO2 fixation solely in the light via the C3 pathway, both under well-watered and drought conditions. However, low levels of nocturnal acidification detected in leaves and stems indicate that the CAM cycle is present. The highly speciose mint family, which contains few known CAM-exhibiting species and is composed predominantly of C3 species, appears to be an excellent group of plants for studying the evolutionary origins of CAM and for determining the position of facultative CAM along the C3–full CAM trajectory.

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“…Coleus (Coleus scutellarioides) is a common ornamental bedding plant that is bred for its brilliant and diverse foliar color patterning (Bailey, 1924;Pedley & Pedley, 1974;Paton et al, 2018Paton et al, , 2019. Wild relatives in the Coleus genus harbor a small degree of variegated pigmentation that has been expanded into distinctive new cultivars that harbor complex variegation patterns through successive rounds of hybridization and selection (Suddee et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Quantitative dissection of color patterning in the foliar ornamental Coleus reveals underlying features driving aesthetic value

Coneva

Clark

et al. 2021

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SummaryColeus is a popular ornamental plant that exhibits a diverse array of foliar color patterns. New cultivars are currently hand selected by both amateur and experienced plant breeders. In this study, we reimagine coleus breeding using a quantitative color analysis framework.Despite impressive advances in high-throughput data collection and processing, complex color patterns remain challenging to extract from image datasets. Using a new phenotyping approach called “ColourQuant,” we extract and analyze pigmentation patterns from one of the largest coleus breeding populations in the world.Working with this massive dataset, we are able to analyze quantitative relationships between maternal plants and their progeny, identify features that underlie breeder-selections, and collect and compare consumer input on trait preferences.This study is one of the most comprehensive explorations into complex color patterning in plant biology and provides new insights and tools for exploring the color pallet of the plant kingdom.

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Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): a tale of more than two genera

Cited by 41 publications

References 32 publications

An updated tribal classification of Lamiaceae based on plastome phylogenomics

An updated tribal classification of Lamiaceae based on plastome phylogenomics

Constitutive and facultative crassulacean acid metabolism (CAM) in Cuban oregano,

Quantitative dissection of color patterning in the foliar ornamental Coleus reveals underlying features driving aesthetic value

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