Chromosome studies on eight species of Eryngium L. (Saniculoideae, Apiaceae) from Argentina
A cytological analysis of eight Argentinean species of Eryngium L. (Saniculoideae, Apiaceae) is carried out. Karyotypes of eight species and original chromosome counts for three of them (indicated with an asterisk) are notified: E. coronatum*Hook. et Arn. (2n=2x-16; 14m + 2sm), E. echinatum Urb. (2n...
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| Autores principales: | , , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00087114_v55_n4_p315_Calvino |
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| Sumario: | A cytological analysis of eight Argentinean species of Eryngium L. (Saniculoideae, Apiaceae) is carried out. Karyotypes of eight species and original chromosome counts for three of them (indicated with an asterisk) are notified: E. coronatum*Hook. et Arn. (2n=2x-16; 14m + 2sm), E. echinatum Urb. (2n=2x=16; 12m + 2m-sm + 2sm), E. nudicaule Lam. (2n=2x=14; 8m + 2m-sm + 4sm), E. eburneum Decne. (2n=2x=16; 8m + 2m-sm + 6sm), E. horridum Malme (2n=2x=16; 12m + 4sm), E. megapotamicum*Malme (2n=4x=32; 4m + 6m-sm + 22sm), E. mesopotamicum* Pedersen (2n=6x=48; 30m + 16sm +2st), and E. pandanifolium Cham. et Schlechtd. (2n=6x=48; 26m + 4m-sm + 14sm + 4st). The first three species belong to the Section Foetida, while the remaining five, belong to Panniculata. Both Sections are easily differentiated by morphology; our chromosomal study shows that these sections can also be recognized karyologically. All the species, except E. nudicaule (x=7), present x=8 which is the most common basic chromosome number in the genus and in the subfamily Saniculoideae. The karyotype analysis made on the eight species mainly shows metacentric and submetacentric chromosomes differing in proportion between species; only E. pandanifolium and E. mesopotamicum show subtelocentric pairs. These two species only differ in the color of their inflorescences; besides, differences in their karyotypes were negligible. These facts agree with the suggestion that they would be varieties of the same species. Two different phenomena seem to have occurred during karyotype evolution in the genus Eryngium: aneuploidy within Section Foetida, and polyploidy within Section Panniculata. © 2002 Taylor and Francis Group, LLC. |
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