Abstract
Abstract Setiechinopsis is a monotypic Argentine endemic genus (S. mirabilis) of the tribe Trichocereeae. It is one of the most difficult cacti to find and grows in lowlands and brackish soils. Our aim was to analyze for the first time its cytogenetic features in two populations. It presented 2n = 22 with small chromosomes (mean chromosome length = 2.87 μm; mean haploid genome length = 31.60 μm). The karyotype was symmetrical: 10m + 1sm. The first m pair (No. 1) had nucleolar organizing regions and terminal microsatellites on the short arms. The ratio of the length of the largest m chromosome pair (No. 1) to that of the smallest m chromosome pair (No. 10) was 1.55. Banding patterns showed CMA+/DAPI− constitutive NOR-associated heterochromatin in m chromosome pair No. 1, comprising the distal satellite and a small proximal band. Additionally, four m chromosome pairs showed CMA+/DAPI− pericentromeric bands. The percentage of CMA+/DAPI− heterochromatin was 11.22% of the total karyotype length. No CMA−/DAPI+ ...
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