Cytotaxonomic study of the Chilean endemic complexAlstroemeria magnifica Herb.(Alstroemeriaceae)

摘要

Alstroemeria L. (Alstroemeriaceae) represents one of the most diverse genera of vascular plants in Chile. It contains approximately 54 taxa, 40 of which are endemic. The “complex” Alstroemeria magnifica is endemic to Chile, and it comprises four varieties: A. magnifica var. magenta, A. magnifica var. magnifica, A. magnifica var. sierrae, and A. magnifica var. tofoensis. It is distributed from Coquimbo to the Valparaíso Region. We analyzed karyotypes of 10 populations along its natural distribution. All the populations presented an asymmetric karyotype, with 2n = 16 chromosomes but with three different karyotypic formulae. Alstroemeria magnifica var. magnifica and A. magnifica var. sierrae presented the same karyotypic fomula, and A. magnifica var. magenta, and A. magnifica var. tofoensis each had a different formula. The scatter plot among CVCLvs. MCA shows different groupings betweenpopulations of the four varieties. Based on the results, it is possible toconsider raising Alstroemeria magnifica var.magenta to species level (A.magenta) and A. magnifica var.tofoensis to subspecies level (A.magnifica subsp. tofoensis); A.magnifica var. magnifica and A.magnifica var. sierrae should each remain asvarieties. Nevertheless, these taxonomic changes should be considered tentative,as additional sources of evidence become available.