Karyotype study in Luzuriaga radicans (Liliales: Luzuriagaceae)

Abstract

The karyotype of Luzuriaga radicans R. & P. was quantitatively studied, assessing characters such as chromosome morphology and size, satellite location, asymmetry level and bimodality. L. radicans has an asymmetric and bimodal karyotype 2n = 20 with three metacentric pairs, followed by six submetacentric and one subtelocentric chromosome pair. One satellite was observed in the short arm of chromosome pair 6. The total haploid set length was 48.7 µm and the mean chromosome size was 4.87 ± 2.35 µm. Comparing L. radicans with other two species of the genus a high resemblance among their karyotypes was found.

Ribosomal DNA distribution and a genus‐wide phylogeny reveal patterns of chromosomal evolution in Alstroemeria (Alstroemeriaceae)

“…15 species have been investigated; Stephens et al, 1993; Buitendijk and Ramanna, 1996; Kamstra et al, 1997; Sanso and Hunziker, 1998; Sanso, 2002; Jara‐Seguel et al, 2004; Baeza et al, 2006; Baeza et al, 2010). The karyotypes of the few species of Bomarea , Drymophila , and Luzuriaga that have been studied also are asymmetric and bimodal (Jara‐Seguel et al, 2005, 2010; Baeza et al, 2008). All nine Bomarea species counted have n = 9, while Luzuriaga and Drymophila species have n = 10 (Appendix S1).…”

“…Molecular phylogeny of the Alstroemeriaceae (simplified from Chacón et al, 2012) showing cytogenetic characteristics, such as the haploid chromosome number ( n ), the total haploid length of all chromosomes (THL in µm), the level of karyotype asymmetry, and karyotype morphology (bimodal = karyotypes comprising two size classes). Information was taken from Conran (1987); Sanso and Hunziker (1998); Sanso (2002); Baeza et al (2007, 2008), Palma‐Rojas et al (2007); and Jara‐Seguel et al (2010).…”

Chromosomic Studies in Zephyranthes Citrina Baker (Amaryllidaceae), a Polyploid Ornamental

“…Today, cytogenetics is recognized as a powerful tool to understand genetic variation processes, genome structure and dynamics, as well as evolution and speciation (Leitch and Leitch, 2012). Cytogenetics has also supported taxonomic circumscriptions in various plant groups (Widham and Yatskievych, 2003;Jara Seguel et al, 2010;Jara Seguel and Urrutia, 2012;Guerra, 2012) and in several cases has related extant species with extinct species found in fossil records (Bonde et al, 2004).…”

“…Karyotype data have been collected for 84 angiosperm species belonging to ten families (Alstroemeriaceae, Amaryllidaceae, Asteraceae, Fabaceae, Krameriaceae, Luzuriagaceae, Myrtaceae, Philesiaceae, Poaceae and Solanaceae) all encompassed within the orders Asparagales, Asterales, Fabales, Liliales, Myrtales, Poales, Solanales and Zygophyllales. In several genera of Liliales -where the karyotypes are asymmetric and bimodal-, the largest chromosome pair is three to seven times longer than the shortest pair (e.g., Alstroemeria, Lapageria, Luzuriaga) (Jara Jara Seguel and Zúñiga, 2004;Baeza et al, 2010a;Jara Seguel et al, 2010;. The karyotype morphology for species of the families Alstroemeriaceae, Asteraceae, and Amaryllidaceae has been the most intensively researched in Chile, with various species and subspecies restudied using fluorescent methods (FISH, DAPI, CMA 3 ).…”

Tp53 Pathogenic Variants Related to Cancer

“…It is remarkable that the Chilean taxa of Krameria form part of the most southern species along the geographical range of the genus in America (Simpson et al, 2004). In this sense karyotype studies including heterochromatin location may be fundamental to understand patterns on genetic variation, genome evolution and speciation in these plants (Stebbins, 1971;Guerra, 2000;Levin, 2002;Jara Seguel et al, 2010;Jara Arancio et al, 2012;Jara Seguel and Urrutia, 2012), and may contribute significantly to establish the cytological relationships among North American and South American Krameria species, supplying also additional evidence for its taxonomic status within the Zygophyllales. For this reason, we describe the karyotype morphology and the distribution of constitutive heterochromatin in K. cistoidea, the most representative species of the genus present in the Chilean flora.…”