CYTOGENETIC STUDIES IN POPULATIONS OF HYPOCHAERIS APARGIOIDES HOOK. ET ARN. (ASTERACEAE, LACTUCEAE) FROM CHILE

Abstract

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.