Chromosome number of two Chilean species of Nothofagus (Nothofagaceae)

Abstract

RESUMENSe documenta un número cromosómico 2n = 26 (x = 13) para Nothofagus dombeyi (Mirb.) Oerst. y N. glauca (Phil.) Krasser, el cual es similar al descrito previamente para otras especies del género. Se incrementan a 13 las especies de Nothofagus con número cromosómico conocido, existiendo dos números básicos (x = 13, 14).

Understanding the extensive hybridization in South American Nothofagus through karyotype analysis

“…Nothofagus spp. examined here are diploids with 2n = 2x = 26, which is consistent with the chromosome number reported for all species studied in Nothofagaceae so far (Armstrong & Wylie, 1965;Wardle, 1967;Ono, 1977;Carr & McPherson, 1986;Jara-Seguel et al, 2014), with the exception of N. cunninghamii (Hook.) Oerst.…”

“…Although the techniques used here are not comparable with those implemented by Ono (1977) and Jara-Seguel et al (2014), we also found that chromosomes of Nothofagus are small (< 2 µm). Notably, chromosomes of N. pumilio are of similar size to those of the other studied Nothofagus spp., contrary to observations by Ono (1977).…”

“…with 2n = 2x = 28 (Wiltshire & Jackson, 2003). Chromosome numbers for N. nervosa, N. antarctica, N. dombeyi, N. glauca, N. obliqua and N. pumilio are here confirmed (Ono, 1977;Jara-Seguel et al, 2014), whereas those for N. alessandrii, N. betuloides, N. macrocarpa and N. nitida are reported for the first time. This is the first detailed karyotype study examining Nothofagus spp.…”

“…(Zoldos et al, 1999;Chokchaichamnankit et al, 2008;Ribeiro et al, 2011). Thus, the Lophozonia clade may have retained some ancestral chromosome characters, as postulated by Jara-Seguel et al (2014) due to the diploid number of 2n = 2x = 28 (Wiltshire & Jackson, 2003) found in N. cunninghamii (from the Lophozonia clade); this chromosome number could be considered the ancestral chromosome number in Nothofagus. Accordingly, Armstrong & Wylie (1965) postulated that the basic chromosome number x = 13 could represent a reduction from x = 14, the predominant number in other members of the families of Fagales, including Betulaceae.…”

IAPT chromosome data 40

“…First estimation for this family. Nothofagus Blume chromosome number has been reported to be very stable, with this species showing the genus' most frequent number of 2n = 26 (Jara-Seguel & al., 2014). Values of 2C including or close to the one reported here have been testified for the close families of Fagaceae, Juglandaceae or Betulaceae (Pellicer & Leitch, 2020).…”