Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages

Larridon, Isabel; Bauters, Kenneth; Semmouri, Ilias; Viljoen, Jan‐Adriaan; Prychid, Christina C.J.; Muasya, Muthama; Bruhl, Jeremy J.; Wilson, Karen L.; Senterre, Bruno; Goetghebeur, Paul

doi:10.1016/j.ympev.2018.04.016

Cited by 22 publications

(41 citation statements)

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“…The genus Costularia C.B.Clarke (Cyperaceae tribe Schoeneae ) was previously circumscribed as including 25 species (Govaerts et al, 2018). However, a recent molecular phylogenetic study firmly established the polyphyly of the genus as previously circumscribed (Larridon et al, 2018a), which was already hinted at in previous works (Seberg, 1986, 1988a, 1988b; Browning & Gordon-Gray, 1995; Bruhl, 1995; Zhang et al, 2004; Verboom, 2006; Viljoen et al, 2013) and supported in the most recent family-wide study (Semmouri et al, 2018). Larridon et al (2018a) showed that Costularia s.l.…”

Section: Introductionsupporting

confidence: 63%

“…Table 1 gives an overview of the seven species of Costularia s.s. treated by Chermezon (1937), the nine species treated by Kükenthal (1939), and the 11 currently recognised species (Govaerts et al, 2018). Costularia s.s. as here accepted more or less equates to Costularia subgenus Costularia sensu Kükenthal (1939) (Larridon et al, 2018a). The Catalogue of the Vascular Plants of Madagascar states that there may still be a number of new Madagascan endemic species to describe (Tropicos.org, 2018).…”

Section: Introductionmentioning

confidence: 72%

“…prop. (Larridon, Verboom & Muasya, 2017b, 2018b; Larridon et al, 2018a) and (4) the species Xyroschoenus hornei (C.B.Clarke) Larridon (basionym: Schoenus hornei C.B.Clarke, nom. cons.…”

Section: Introductionmentioning

confidence: 99%

“…prop. ; Larridon, Govaerts & Goetghebeur, 2017a, Larridon et al, 2018a) which is endemic to the Seychelles. Only the latter species and species of Costularia s.s. are found in Africa and/or on the islands in the Indian Ocean (Henriette et al, 2015; Larridon et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

“…; Larridon, Govaerts & Goetghebeur, 2017a, Larridon et al, 2018a) which is endemic to the Seychelles. Only the latter species and species of Costularia s.s. are found in Africa and/or on the islands in the Indian Ocean (Henriette et al, 2015; Larridon et al, 2018a). Three earlier publications revised species of Costularia s.s. (Chermezon, 1937; Kükenthal, 1939; Henriette et al, 2015) since Clarke (1897–1898) erected the genus based on the species Costularia natalensis C.B.Clarke, as well as a species now included in Capeobolus Browning ( Costularia brevicaulis C.B.Clarke; Browning & Gordon-Gray, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Revision of the Afro-Madagascan genus Costularia (Schoeneae, Cyperaceae): infrageneric relationships and species delimitation

Larridon

Rabarivola

Xanthos

et al. 2019

PeerJ

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A recent molecular phylogenetic study revealed four distinct evolutionary lineages in the genus Costularia s.l. (Schoeneae, Cyperaceae, Poales). Two lineages are part of the Oreobolus clade of tribe Schoeneae: the first being a much-reduced genus Costularia s.s., and the second a lineage endemic to New Caledonia for which a new genus Chamaedendron was erected. The other two lineages were shown to be part of the Tricostularia clade of tribe Schoeneae. Based on morphological and molecular data, the genus Costularia is here redelimited to represent a monophyletic entity including 15 species, which is restricted in distribution to southeastern Africa (Malawi, Mozambique, South Africa, Swaziland, Zimbabwe), Madagascar, the Mascarenes (La Réunion, Mauritius), and the Seychelles (Mahé). Molecular phylogenetic data based on two nuclear markers (ETS, ITS) and a chloroplast marker (trnL-F) resolve the studied taxa as monophyletic where multiple accessions could be included (except for Costularia laxa and Costularia purpurea, which are now considered conspecific), and indicate that the genus dispersed once to Africa, twice to the Mascarenes, and once to the Seychelles. Two endemic species from Madagascar are here described and illustrated as new to science, as is one additional species endemic to La Réunion. Two taxa previously accepted as varieties of Costularia pantopoda are here recognised at species level (Costularia baronii and Costularia robusta). We provide a taxonomic revision including an identification key, species descriptions and illustrations, distribution maps and assessments of conservation status for all species.

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Section: Introductionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 72%

“…prop. (Larridon, Verboom & Muasya, 2017b, 2018b; Larridon et al, 2018a) and (4) the species Xyroschoenus hornei (C.B.Clarke) Larridon (basionym: Schoenus hornei C.B.Clarke, nom. cons.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Revision of the Afro-Madagascan genus Costularia (Schoeneae, Cyperaceae): infrageneric relationships and species delimitation

Larridon

Rabarivola

Xanthos

et al. 2019

PeerJ

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Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences

van Mazijk,

West,

Verboom

et al. 2024

American J of Botany

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PremiseIncreases in genome size in plants—often associated with larger, low‐density stomata and greater water‐use efficiency (WUE)—could affect plant ecophysiological and hydraulic function. Variation in plant genome size is often due to polyploidy, having occurred repeatedly in the austral sedge genus Schoenus in the Cape Floristic Region (CFR), while species in the other major schoenoid genus in the region, Tetraria, have smaller genomes. Comparing these genera is useful as they co‐occur at the landscape level, under broadly similar bioclimatic conditions. We hypothesized that CFR Schoenus have greater WUE, with lower maximum stomatal conductance (gwmax) imposed by larger, less‐dense stomata.MethodsWe investigated relationships between genome size and stomatal parameters in a phylogenetic context, reconstructing a phylogeny of CFR‐occurring Schoeneae (Cyperaceae). Species’ stomatal and functional traits were measured from field‐collected and herbarium specimens. Carbon stable isotopes were used as an index of WUE. Genome size was derived from flow‐cytometric measurements of leafy shoots.ResultsEvolutionary regressions demonstrated that stomatal size and density covary with genome size, positively and negatively, respectively, with genome size explaining 72–75% of the variation in stomatal size. Larger‐genomed species had lower gwmax and C:N ratios, particularly in culms.ConclusionsWe interpret differences in vegetative physiology between the genera as evidence of more‐conservative strategies in CFR Schoenus compared to the more‐acquisitive Tetraria. Because Schoenus have smaller, reduced leaves, they likely rely more on culm photosynthesis than Tetraria. Across the CFR Schoeneae, ecophysiology correlates with genome size, but confounding sources of trait variation limit inferences about causal relationships between traits.

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Co-inoculation with a bacterium and arbuscular mycorrhizal fungi improves root colonization, plant mineral nutrition, and plant growth of a Cyperaceae plant in an ultramafic soil

Bourles¹,

Guentas

Charvis³

et al. 2020

Mycorrhiza

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Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages

Cited by 22 publications

References 72 publications

Revision of the Afro-Madagascan genus Costularia (Schoeneae, Cyperaceae): infrageneric relationships and species delimitation

Revision of the Afro-Madagascan genus Costularia (Schoeneae, Cyperaceae): infrageneric relationships and species delimitation

Genome size variation in Cape schoenoid sedges (Schoeneae) and its ecophysiological consequences

Co-inoculation with a bacterium and arbuscular mycorrhizal fungi improves root colonization, plant mineral nutrition, and plant growth of a Cyperaceae plant in an ultramafic soil

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