Karyotype traits in Grindelia squarrosa (Pursh) Dunal (Asteraceae), an invasive plant in Romania

Abstract

The description of the karyotype features and idiogram in Grindelia squarrosa (Pursh) Dunal (Asteraceae), an invasive plant in Romania, are reported here for the first time. The diploid chromosome number is 2n=2x=12, in agreement with the data published for the other species of the genus. The karyomorphological data show that the complements of the studied genotypes have small chromosomes (mean chromosome length is X̅±SE=2.56±0.10 μm, and mean length of haploid complements is X̅±SE=15.33±0.69 μm, with a range of variability comprised between 12.87-17.51 μm). The karyotypes are made up of six pairs of metacentric and submetacentric chromosomes, with an identical formula of the diploid complement: KF=2n=12=8m+ 2sm + 2sm-SAT. Satellites are located on the short arms of the chromosomes of pair III. The karyotypes show a relatively high level of intra-specific uniformity as well as similar symmetry patterns (R=1.29-1.53; TF%=38.78-41.57%; AsI%=54.54-57.61%; A1 = 0.24- 0.32; A2=0.08-0.16), belonging to 1A and 2A classes of symmetry. The small size of the chromosomes, the presence of only two chromosome morphometric types, and the preponderance of metacentrics confer a relatively high degree of symmetry to the karyotypes studied.

Grindelia squarrosa in Ukraine: current distribution and ecological and coenotic peculiarities

“…The first data on the finding of wild plants in Europe were recorded from the 40's of the last century: Lithuania in 1946 (Natkevičaitė 1951, Gudžinskas 1997 and Ukraine in 1949 (Bilyk 1950), later -Moldova in 1958(Myrza et al 1987), Latvia in 1960(Flora of the Baltic Republics 2003. The next record of the species is from the North Caucasus in 1984 (Ignatov & Makarov 1984), Udmurtia (Puzyrev 1985), in many regions of the European part of Russia (Flora ... 1994), in the Far East (Kozhevnikov & Kozhevnikova 2007), Belarus in 1986 (Tretyakov 1990), Slovakia in 1992 (Jehlik et al 2013), Romania in 1998 (Anastasiu & Negrean, 2005, Sîrbu & Oprea 2008, Truta et al 2012, Estonia in 1999 (Kukk 1999), Ireland in 2002 (Reynolds 2002), Belgium in 2005 (Verloove 2006), Hungary in 2004 (Balogh et al 2004, Botta-Dukát 2008, Bulgaria in 2009 (Vladimirov & Petrova 2012), Georgia in 2013 (Jinjolia & Shakarishvili 2014) and Armenia in 2016 (Gabrielian et al 2016). Distribution centres of this species are also found outside the Holarctis, in South America and Australia (Hansen 1976).…”

Specifics of the ontogenesis of Grindelia squarrosa in populations from eastern Ukraine

“…Молдові (Мырза et al 1987), Німеччині, Румунії (Anastasiu & Negrean 2005;Truta et al 2012); Словаччині (Jehlik et al 2013), Угорщині (Botta-Dukát 2008, Чехії (Pyšek et al 2002), тощо.…”