Kenneth Oberlander
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View article: Friends or foes? Polyploidy and competition in a grassland geophyte
Friends or foes? Polyploidy and competition in a grassland geophyte Open
Previous studies have suggested polyploids may possess a competitive advantage over diploids, due to their larger size, increased vigour or ability to better respond to abiotic stress. However, few studies have tested the effect of polyplo…
View article: Friends without benefits: Extensive cytotype sympatry and polyploid persistence in an African geophyte
Friends without benefits: Extensive cytotype sympatry and polyploid persistence in an African geophyte Open
Premise Polyploidy is a major factor in plant adaptation and speciation. Multiple mechanisms contribute to autopolyploid frequency within populations, but uncertainties remain regarding mechanisms that facilitate polyploid establishment an…
View article: Morphological and habitat differentiation between diploids and tetraploids of a Drakensberg near‐endemic taxon, <i>Rhodohypoxis baurii</i> var. <i>platypetala</i> (Hypoxidaceae)
Morphological and habitat differentiation between diploids and tetraploids of a Drakensberg near‐endemic taxon, <i>Rhodohypoxis baurii</i> var. <i>platypetala</i> (Hypoxidaceae) Open
Environmental factors may shape the spatial distribution of ploidy levels. Here, we undertook a cytogeographical study of Rhodohypoxis baurii var. platypetala (Hypoxidaceae), a Drakensberg near‐endemic taxon. We addressed the following que…
View article: <scp>IAPT</scp> chromosome data 39 – Extended version
<span>IAPT</span> chromosome data 39 – Extended version Open
*Address for correspondence: [email protected] Financial support from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) and FAPESQ (Fundação de Apoio à…
View article: A novel species of <i>Microsphaeropsis</i> causing cankers on <i>Rafnia amplexicaulis</i> in South Africa
A novel species of <i>Microsphaeropsis</i> causing cankers on <i>Rafnia amplexicaulis</i> in South Africa Open
Cankers leading to branch, stem and plant death were observed on the South African endemic Rafnia amplexicaulis ( Fabaceae ) in the Cederberg Wilderness Area, South Africa, during September 2021. Conidiomatal pycnidia were found developing…
View article: Revision of the enigmatic South African Cryptolaryngini (Coleoptera, Curculionidae), with description of a new genus and twenty-two new species
Revision of the enigmatic South African Cryptolaryngini (Coleoptera, Curculionidae), with description of a new genus and twenty-two new species Open
The weevil genus Cryptolarynx Van Schalkwyk, 1966 is endemic to the Northern and Western Cape provinces of South Africa. The two previously known species of the genus, C. vitis (Marshall, 1957) and C. estriatus (Marshall, 1957), have an ab…
View article: Revision of the enigmatic South African Cryptolaryngini (Coleoptera, Curculionidae), with description of a new genus and twenty-two new species
Revision of the enigmatic South African Cryptolaryngini (Coleoptera, Curculionidae), with description of a new genus and twenty-two new species Open
This dataset contains the digitized treatments in Plazi based on the original journal article Haran, Julien M., Marvaldi, Adriana E., Benoit, Laure, Oberlander, Kenneth, Stals, Riaan, Oberprieler, Rolf G. (2023): Revision of the enigmatic …
View article: Inconsistent expression of the gigas effect in polyploid Oxalis - AJB-D-22-00124
Inconsistent expression of the gigas effect in polyploid Oxalis - AJB-D-22-00124 Open
Datasets pertaining to measuring the presence and degree of the gigas effect in polyploid oxalis.
View article: <i>Oxalis</i> seeds from the Cape Flora have a spectrum of germination strategies
<i>Oxalis</i> seeds from the Cape Flora have a spectrum of germination strategies Open
Premise Seed germination strategy has profound ecological and evolutionary consequences, with transitions between germination strategies receiving renewed recent attention. Oxalis from the Cape Flora, South Africa, has seeds with two contr…
View article: Repression of Sex4 and Like Sex Four2 Orthologs in Potato Increases Tuber Starch Bound Phosphate With Concomitant Alterations in Starch Physical Properties
Repression of Sex4 and Like Sex Four2 Orthologs in Potato Increases Tuber Starch Bound Phosphate With Concomitant Alterations in Starch Physical Properties Open
To examine the roles of starch phosphatases in potatoes, transgenic lines were produced where orthologs of SEX4 and LIKE SEX FOUR2 (LSF2) were repressed using RNAi constructs. Although repression of either SEX4 or LSF2 inhibited leaf starc…
View article: Nomenclatural notes on southern African Oxalis species
Nomenclatural notes on southern African Oxalis species Open
Background: The correct author citation of Oxalis sonderiana (Kuntze) J.F.Macbr. and the validity and identity of the species Oxalis beneprotecta R.Knuth, Oxalis bullulata T.M.Salter and Oxalis pulchella Jacq. var. beneprotecta (R.Knuth) T…
View article: Two new Oxalis (Oxalidaceae) species, including 5 varieties, from the Richtersveld of South Africa
Two new Oxalis (Oxalidaceae) species, including 5 varieties, from the Richtersveld of South Africa Open
Two new species of Oxalis (Oxalidaceae) from the Richtersveld are described, namely Oxalis canaliculata and O. magnifolia. These widespread species are morphologically distinct and easily identified, but both contain populations in which i…
View article: Plastid capture and resultant fitness costs of hybridization in the Hirta clade of southern African Oxalis
Plastid capture and resultant fitness costs of hybridization in the Hirta clade of southern African Oxalis Open
Ancient hybridization leading to plastid capture is a likely cause of cytonuclear discordance, although discordance may also be attributed to other mechanisms. Cytonuclear discordance is ubiquitous in a clade of southern African Oxalis kno…
View article: The phylogenetic significance of leaf anatomical traits of southern African Oxalis
The phylogenetic significance of leaf anatomical traits of southern African Oxalis Open
Major and unexpected findings include the transition from ancestral hypostomatic leaflets to adaxially-located stomata in the vast majority of southern African Oxalis, the loss of semi-swollen AB epidermal cells and the gain of swollen ada…
View article: Species‐rich and polyploid‐poor: Insights into the evolutionary role of whole‐genome duplication from the Cape flora biodiversity hotspot
Species‐rich and polyploid‐poor: Insights into the evolutionary role of whole‐genome duplication from the Cape flora biodiversity hotspot Open
PREMISE OF THE STUDY: Whole‐genome duplication (WGD) in angiosperms has been hypothesized to be advantageous in unstable environments and/or to increase diversification rates, leading to radiations. Under the first hypothesis, floras in st…
View article: Additional file 1: Table S1. of The phylogenetic significance of leaf anatomical traits of southern African Oxalis
Additional file 1: Table S1. of The phylogenetic significance of leaf anatomical traits of southern African Oxalis Open
Discrete and continuous leaflet anatomical data for southern African Oxalis. The discrete and continuous data of all studied leaflet anatomical traits. Captions of columns for discrete data include character state descriptions and captions…
View article: Additional file 2: Table S2. of The phylogenetic significance of leaf anatomical traits of southern African Oxalis
Additional file 2: Table S2. of The phylogenetic significance of leaf anatomical traits of southern African Oxalis Open
The list of newly-collected taxa added to the phylogeny of Oberlander et al. (2011). Description of data: Phylogenetic trees were reconstructed using an expanded ITS data set from Oberlander et al. (2011) [19], including sequences from 13 …