IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
artículos
Título:
Karyotype analysis of the southernmost South American species of Stemodia (Scrophulariaceae)
Autor/es:
SOSA, M.M., A.F. PANSERI AND A. FERNÁNDEZ
Revista:
PLANT BIOSYSTEMS
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Roma; Año: 2011 vol. 145 p. 247 - 250
ISSN:
1126-3504
Resumen:
The aim of the present study was to examine the somatic chromosomes of seven species of Stemodia (Scrophulariaceae). Thekaryotypes of Stemodia ericifolia (2n¼22¼20m þ 2 sm), S. hassleriana (2n¼22¼20m þ 2sm), S. hyptoides (2n¼22¼20mþ 2sm), S. hyptoides (2n¼44¼40m þ 4sm), S. lobelioides (2n¼44¼40m þ 4sm) and S. stricta (2n¼22¼20m þ 2sm) wereanalyzed for the first time. All the species studied showed a predominance of metacentric chromosomes and a lowerproportion of submetacentric pairs. The chromosomes in all the species were found to be small with a mean chromosomelength of 1.42 mm, varying from 0.77 mm in S. hyptoides (2n¼66) to 2.10 mm in S. lanceolata. The differences in theasymmetry of the karyotypes were small, for which it is possible to assume that the great diversification of the genus has beenaccompanied by very small changes in the structure of the chromosomes.