Resumen

BAEZA, Carlos; JARA, Solange  y  STUESSY, Tod. CYTOGENETIC studies in Populations of HYPOCHAERIS APARGIOiDES Hook. et Arn. (Asteraceae, Lactuceae) FROM CHILE. Gayana Bot. [online]. 2006, vol.63, n.1, pp. 99-105. ISSN 0717-6643.  doi: 10.4067/S0717-66432006000100005.

Karyotypic data are presented for plants in seven populations of Hypochaeris apargioides Hook. et Arn. from the VIII Region of Chile.  Individuals reveal a chromosome number of 2n = 8  or 2n = 16.  The basic set of chromosomes does not differ significantly in the index of karyotypic asymmetry (AsI%) or the intrachromosomal index (A₁).  The basic chromosomal set in all seven populations consists of two pairs of metacentric chromosomes and 2 pairs of subtelocentric chromosomes.  Another noteworthy characteristic is the presence of secondary constrictions in the long arm of chromosome number 2 and in the short arm of chromosome number 3.  This is the first report of tetraploids 2n = 16, in this species, and they are found in two different populations

Palabras clave : Asteraceae; Chile; karyotype; Hypochaeris apargioides; chromosome numbers.