A taxonomic nightmare comes true: phylogeny and biogeography of glassworts (Salicornia L., Chenopodiaceae)
MetadataShow full item record
In this study we analysed ETS sequence data of 164 accessions belonging to 31 taxa of Salicornia, a widespread, hygrohalophytic genus of succulent, annual herbs of Chenopodiaceae subfam. Salicornioideae, to investigate phylogenetic and biogeographical patterns and hypothesise about the processes that shaped them. Furthermore, our aim was to understand the reasons for the notorious taxonomic difficulties in Salicornia. Salicornia probably originated during the Miocene somewhere between the Mediterranean and Central Asia from within the perennial Sarcocornia and started to diversify during Late Pliocene/Early Pleistocene. The climatic deterioration and landscape-evolution caused by orogenetic processes probably favoured the evolution and initial diversification of this annual, strongly inbreeding lineage from the perennial Sarcocornia that shows only very limited frost tolerance. The further diversification of Salicornia was promoted by at least five intercontinental dispersal events (2× to South Africa, at least 3× to North America) and at least two independentpolyploidization events resulting in rapidly expanding tetraploid lineages, both of which are able to grow in lower belts of the saltmarshes than their diploid relatives. The diploid lineages of Salicornia also show rapid and effective range expansion resulting in both widespread genotypes and multiple genotypes in a given area. Reproductive isolation through geographical isolation after dispersal, inbreeding, and comparatively young age might be responsible for the large number of only weakly differentiated lineages. The sequence data show that the taxonomic confusion in Salicornia has two major reasons: (1) in the absence of a global revision and the presence of high phenotypic plasticity, the same widespread genotypes having been given different names in different regions, and (2) striking morphological parallelism and weak morphological differentiation led to the misapplication of the same name to different genotypes in one region.
This item may be available from Professor Ladislav Mucina
Showing items related by title, author, creator and subject.
Gardy, J.; Johnston, J.; Ho Sui, S.; Cook, V.; Shah, L.; Brodkin, E.; Rempel, S.; Moore, R.; Zhao, Y.; Holt, R.; Varhol, Richard; Birol, I.; Lem, M.; Sharma, M.; Elwood, K.; Jones, S.; Brinkman, F.; Brunham, R.; Tang, P. (2011)Background: An outbreak of tuberculosis occurred over a 3-year period in a medium-size community in British Columbia, Canada. The results of mycobacterial interspersed repetitive unit-variable-number tandem-repeat (MIRU-VNTR) ...
Widespread transmission of distinct genetic lineages of Murray Valley encephalitis virus in Australia, 2008-2009Williams, David; Diviney, Sinead; Niazi, A.; Herring, B.; Johansen, C.; MacKenzie, John (2011)Murray valley encephalitis virus (MVEV) is the most important cause of arboviral neurological disease in humans in Australia. Increased activity of MVEV was observed in Australia in 2008 and 2009, leading to fatal human ...
Widespread transmission of distinct genetic lineages of Murray Valley encephalitis virus in Australia, 2008-2009Williams, David; Diviney, Sinead; Niazi, A.; Herring, B.; Johansen, C.; MacKenzie, John (2011)Increased activity of the mosquito-borne Murray valley encephalitis virus (MVEV) was observed in Australia in 2008 and 2009, leading to fatal human and equine cases, and renewed concerns regarding its potential to spread ...