37 research outputs found
Prevalence of temporomandibular disorders in postmenopausal women and relationship with pain and HRT
Sexual dimorphism in the effect of nonhabituating stress on neurogenic plasma extravasation
Influencia de los cambios hormonales del ciclo menstrual en la percepción del dolor en las disfunciones temporomandibulares. Una revisión sistemática de la literatura médica
Impact of prolotherapy in temporomandibular joint disorder: a quality of life assessment
Multiple origins and chromosomal novelty in the allotetraploid Tragopogon castellanus (Asteraceae)
12 p., gráf., fotos, tablas.Tragopogon includes two classic examples of recently formed allopolyploid species in North America: T. mirus and T. miscellus. Older Tragopogon allotetraploids from Eurasia offer ideal taxa for comparing the longer term outcomes of allopolyploidy.
To help resolve the ancestry of one of these older polyploids, phylogenetic analyses of multiple populations of the allotetraploid T. castellanus (2n = 24) and its putative diploid parents, T. crocifolius and T. lamottei, were conducted using sequences from nuclear (internal transcribed spacer, ITS; and alcohol dehydrogenase 1A, Adh) and plastid (trnT-trnL spacer, trnL intron, trnL-trnF spacer and rpl16 intron) loci. Fluorescence in situ hybridization (FISH) and genomic in situ hybridization (GISH) were used to investigate the chromosomal constitution of T. castellanus.
Our data confirm that the widely distributed T. crocifolius and the Iberian endemic, T. lamottei, are the diploid parents of T. castellanus, and that this polyploid formed at least three times.
One group of populations of T. castellanus is distinct in exhibiting two pairs of rearranged chromosomes. These data suggest that some of the chromosomal variants that originate in young polyploids (here, an intergenomic translocation) may become fixed in populations, contributing to novelty in older polyploid lineages. The geographical distributions of the allopolyploids and parents are also complex, with allotetraploid populations being disjunct from one or both of the most closely related diploid parental populations.This work was supported by US National Science Foundation Grant DEB-1146065. Dr V. N. Suárez-Santiago was funded by a postdoctoral grant from the Spanish Ministry of Education and Science. Clayton J. Visger was funded by US NSF-DGE-1315138.Peer reviewe