RT Journal Article
T1 Karyological Observations in Medicago Section Dendrotelis (Fabaceae)
A1 Rosato, Carmen Luisa Marcela
A1 Rosselló, Josep
AB Medicago section Dendrotelis comprises polyploid, woody shrubs restricted to rocky and cliff faces in coastal places of the Mediterranean basin, showing a very close morphology. This has resulted in controversial taxonomic studies, differing in the circumscription and number of recognized species (from one to three). In the present study, cytogenetic studies (meiotic analysis, C-banding, Ag-NOR banding) were made in M. arborea, M. strasseri, and M. citrina to determine their karyological and evolutionary relationships. The observation of meiocytes revealed a regular meiotic cycle in all species. At pachytene stage, chromosomes showed constitutive heterochromatic blocks (knobs) that were species-specific, and clearly discriminate M. arborea and M. strasseri from M. citrina. Conventional karyotypes of M. strasseri and M. arborea were similar concerning chromosome classes, the apparent chromosome length, and the morphology of the single NOR chromosome pair. However, C-banding technique revealed karyotypic differences between both species. In contrast, M. citrina exhibited a slightly asymmetric karyotype, the presence of two pairs of chromosomes showing secondary constrictions, a similar apparent chromosome length, and two pairs of active rDNA loci. Its C-banded karyotype strikingly differed from those observed in M. arborea and M. strasseri, and only three chromosome pairs showed heterochromatic blocks. These cytogenetic data indicate a clear evolutionary split in woody medics (tetraploid vs hexaploid species), reflecting divergent patterns of karyological evolution. Taken together, all karyological data unequivocally support the recognition of M. citrina as a distinct species.
PB Springer
SN 1211-9520
YR 2009
FD 2009
LK https://hdl.handle.net/20.500.14352/95249
UL https://hdl.handle.net/20.500.14352/95249
LA eng
NO Rosato, M., Rosselló, J.A. Karyological Observations in Medicago Section Dendrotelis (Fabaceae). Folia Geobot 44, 423–433 (2009). https://doi.org/10.1007/s12224-009-9048-7
NO This work has been partially funded by the CGL2007-60550/BOS project.
NO Ministerio de Ciencia e Innovación (España)
DS Docta Complutense
RD 26 abr 2025