Search results for "trnH-psbA"
showing 4 items of 4 documents
Molecular and morphological evidence for hybridization between endemic Canary Island Convolvulus
2007
Morphological data and molecular data from the chloroplast trnH-psbA region and nuclear ribosomal ITS region are used to test the hypothesis that the problematic Canary Island endemic Convolvulus floridus var. virgatus is a hybrid between the endemic species C. floridus and C. scoparius. Analysis of mean leaf length and width of 58 individuals indicates that accessions referable to C. floridus var. virgatus are intermediate between the parental taxa in leaf dimensions. Direct sequencing of the ITS region of C. scoparius and C. floridus revealed two species-specific ribotypes distinguished by 10 base differences. Examination of ITS chromatograms for putative hybrids revealed polymorphisms at…
Convergent Morphological Evolution in Silene Sect. Italicae (Caryophyllaceae) in the Mediterranean Basin
2022
Recent divergence can obscure species boundaries among closely related taxa. Silene section Italicae (Caryophyllaceae) has been taxonomically controversial, with about 30 species described. We investigate species delimitation within this section using 500 specimens sequenced for one nuclear and two plastid markers. Despite the use of a small number of genes, the large number of sequenced samples allowed confident delimitation of 50% of the species. The delimitation of other species (e.g., Silene nemoralis, S. nodulosa and S. andryalifolia) was more challenging. We confirmed that seven of the ten chasmophyte species in the section are not related to each other but are, instead, genetically c…
Taxonomy and evolution of the Convolvulus sabatius complex (Convolvulaceae)
2010
A revision of the Convolvulus sabatius complex is presented and five taxa are now recognised. Convolvulus valentinus is re-circumscribed to comprise only blue-flowered individuals. Yellow-flowered plants previously referred to this species are transferred to C. supinus where they are recognised as a distinct variety: C. supinus var. melliflorus, comb nov. Variation in intensity of flower colour, pubescence and leaf shape among blue-flowered C. valentinus is highly variable within populations and in contrast to earlier treatments, no infraspecific taxa based on these traits are recognised. Despite suggestions to the contrary, the delimitation of the cultivated ornamental C. sabatius and its …
Ocena przydatności loci barkodowych do identyfikacji gatunków roślin łąk i muraw kserotermicznych. Komunikat
2020
Analiza sekwencji kilku loci nosząca nazwę barkodingu, została wykorzystana do identyfikacji gatunków roślin występujących w środkowoeuropejskich zbiorowisk traworoślowych. W toku analizy przebadano użyteczność 14 regionów chloroplastowych i jednego jądrowego do identyfikacji gatunków. Osiem spośród nich (matK, rbcL, rpoC1, trnH-psbA, atpF-atpH, trnL, psbI-psbK i ITS) wykorzystano do stworzenia kombinacji barkodów, które umożliwiają określenie tożsamości próbki tkanki roślinnej o pochodzeniu łąkowym, bez konieczności porównania z kluczem do oznaczania roślin.