Globally grown, but poorly known: species limits and biogeography of Gazania Gaertn. (Asteraceae) inferred from chloroplast and nuclear DNA sequence data
MetadataShow full item record
Gazania is a popular horticultural subject worldwide and comprises 16 species, all from southern Africa. However, species delimitation is difficult as many species are morphologically variable. Here we present a phylogenetic analysis of 15 species of Gazania, based on DNA sequence data from four non-coding chloroplast regions (trnL-intron, trnL-trnF spacer, psbA-trnH spacer, rps16 intron) and two nuclear spacers (InternalTranscribed Spacer, ITS; partial External Transcribed Spacer, ETS). The phylogenies derived from the plastid and nuclear datasets were not entirely congruent, but data combination was undertaken. Of the 15 species sampled, only 7 are supported as monophyletic. Most of the remaining taxa form a large, poorly resolved clade corresponding to a large, morphologically variable species complex. Using a range of ITS mutation rates, the diversification of the genus is estimated to have begun approximately 6.6 mya. The phylogeny, in conjunction with the distribution patterns, suggests that this genus arose in the semi-arid to arid Richtersveld/Namib regions of South Africa and Namibia.
This item may be available from Professor Ladislav Mucina
Showing items related by title, author, creator and subject.
Saeed, Asim (2012)Among different types of membrane modules used for cross flow filtration processes, Spiral Wound Module (SWM) dominates in the area of Ultra Filtration (UF), Nano Filtration (NF) and RO (Reverse Osmosis) due to high packing ...
Lung Deposition of 99mTc-Radiolabeled Albuterol Delivered through a Pressurized Metered Dose Inhaler and Spacer with Facemask or Mouthpiece in Children with AsthmaDitcham, W.; Murdzoska, J.; Zhang, Guicheng; Roller, C.; von Hollen, D.; Nikander, K.; Devadason, G. (2014)Background: Research on the use of a pressurized metered dose inhaler (pMDI) with spacer (pMDI/spacer) in children has indicated oral inhalation via the spacer mouthpiece is more efficient than the combination of oral and ...
Validation of methodology for recording breathing and simulating drug delivery through spacers and valved holding chambersSchultz, A.; Le Souëf, T.; Looi, K.; Zhang, Guicheng; Le Souëf, P.; Devadason, S. (2010)Background: Output from spacers (or valved holding chambers) is sensitive to changes in breathing pattern. Different spacers have unique characteristics that may influence breathing. A method used for breathing simulation, ...