Floral and macroecological evolution within Cyrtanthus (Amaryllidaceae): Inferences from combined analyses of plastid ndhF and nrDNA ITS sequences

Snijman, D. A.; Meerow, Alan W.

doi:10.1016/j.sajb.2009.10.010

Cited by 21 publications

(22 citation statements)

References 72 publications

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“…In addition, part of the ITS region (ITS1) was used to provide an independent source of sequence data. The ITS region as a whole is usually more variable than non-coding chloroplast regions, and has been used extensively in phylogenetic studies at the species level in monocotyledons (Kwembeya & al., 2007;Devey & al., 2008;Peterson & al., 2008;Snijman & Meerow, 2010). Adams & al.…”

Section: Methodsmentioning

confidence: 99%

Revisiting monophyly in Haworthia Duval (Asphodelaceae): Incongruence, hybridization and contemporary speciation

Ramdhani

Barker

Cowling

2011

TAXON

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Molecular phylogenetic reconstructions have indicated that Haworthia is not monophyletic. Here we show, using considerably expanded datasets of both chloroplast (trnL-trnF and psbA-trnH intergenic spacers) and nuclear (ITS1) markers that the issue of a polyphyletic Haworthia is more complicated than previously reported. Both parsimony and bayesian analyses of cpDNA and ITS1 produced poorly resolved phylogenies, with little or no support for deeper nodes. Species of Haworthia are placed in three of the four main lineages in the cpDNA phylogeny, while in the ITS1 phylogeny Haworthia species were placed in two of the four main lineages retrieved. The cpDNA phylogeny was incongruent with that obtained from the ITS1 data, and the topology of the combined dataset reflected that obtained from the ITS1 dataset. As species of H. subg. Hexangulares and subg. Robustipedunculares have been reportedly involved in intergeneric hybridizations with other Alooideae, it is postulated that a history of ancient hybridization may account for a polyphyletic Haworthia. Hybridization is also ongoing between species within H. subg. Haworthia, and may be responsible for results indicating that some species in this subgenus are not monophyletic. This hybridization may be facilitated by the lack of effective reproductive barriers. We hypothesize that Haworthia is undergoing a contemporary and explosive radiation in southern Africa, driven in part by local adaptation to relatively fine-grained ecological heterogeneity of soils and microclimate. OutgroupAloe plicatilis Haworthia II True Aloes Tree-like Aloes Haworthia I Haworthia subg. Haworthia (n = 13) Outgroup Haworthia II Tree-like Aloes Aloe plicatilis Haworthia I True AloesHaworthia subg. Haworthia (n = 4) Aloe ciliaris Aloe aristata Gasteria Haworthia subg. Hexangulares (n = 10) Haworthia subg. Haworthia (n = 2) Gasteria (n = 3) Aloe aristata (n = 2) Astrolaba spiralis (n = 2) Haworthia subg. Hexangulares (n = 18)

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Section: Methodsmentioning

confidence: 99%

Revisiting monophyly in Haworthia Duval (Asphodelaceae): Incongruence, hybridization and contemporary speciation

Ramdhani

Barker

Cowling

2011

TAXON

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“…Contributions on the cultivation and propagation of the species were provided by Du Plessis & Duncan () and Duncan (, b, c) and between 1986 and 2007, seven new species were described (Hilliard & Burtt, ; Snijman, ; ; ; ; Snijman & Van Jaarsveld, ). In addition, a paper on floral and macroecological evolution within the genus, based on molecular analyses, was published (Snijman & Meerow, ). The critically endangered, bright red C. guthriei L. Bolus and the tubular, orange‐flowered C. staadensis Schönland have been featured in recent issues of Curtis's Botanical Magazine, with plates by Elbe Joubert (Duncan, , ) and all 54 species occurring in southern Africa were recently illustrated with plates by Barbara Jeppe and Leigh Voigt in The Amaryllidaceae of Southern Africa (Duncan, ).…”

Section: Platementioning

confidence: 99%

“…R.A. Dyer and C. obliquus (L.f.) Aiton (up to 50–60 mm wide) (Duncan, 2016). The wide variety of different flower shapes attracts a range of pollinators, including sunbirds, butterflies, sphingid and noctuid moths, long‐proboscid flies and short‐tongued bees (Snijman & Meerow, ).…”

Section: Platementioning

confidence: 99%

“…In their molecular study of Cyrtanthus , Snijman & Meerow () identified three informal infrageneric groups, the Gastronema group, found mostly in the southern and eastern summer rainfall parts of South Africa, with mostly broad…”

Section: Platementioning

confidence: 99%

“…After the leaf has died back, the capsule matures within 8 weeks and the bulb lies dormant until spring when the new leaf appears. Cyrtanthus species with large and showy red flowers such as C. elatus are pollinated by the large brown and yellow Aeropetes tulbaghia butterfly (Johnson & Bond, ) and this butterfly is inferred as the primary pollinator of C. taitii (Snijman & Meerow, ).…”

Section: Platementioning

confidence: 99%

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