Chromosome numbers of some North American species of Artemisia (Asteraceae)

Abstract

Chromosome number determinations are reported for 58 accessions, comprising 13 native and introduced taxa of Artemisia found in Canada and the United States. Chromosome numbers observed were n = 8, 9, 18, and 27. A chromosome number of 2n = 18 is the first report for A. pacifica Nutt. A new tetraploid cytotype (2n = 36) was found in A. frigida Willd. Supernumerary chromosomes (n = 9 + 3) and mixoploidy (n = 18, 36) were also observed in this taxon for the first time. Heteroploidy was present in several species. In some taxa, morphological or ecological differences between the chromosomal races were detected; in other cases no differences were noted. Karylogical and phylogenetic evidence is presented for the original chromosome number in Artemisia having been x = 9.

Chromosomal Evolution in Some Iranian Artemisia L. using Numerical Analysis of Karyotypes

“…Section Dracunculus: The chromosome number 2nϭ36 obtained in population of A. campestris agrees with other reports of tetraploid level for this taxon (Kawatani and Ohno 1964, Kuzmanov 1993, Oliva and Valle's 1994 for which diploid population have also been reported (Moore 1982, Stahevich and Wojats 1988, Valle's and Torrell 1995.…”

Big sagebrush: A sea fragmented into lakes, ponds, and puddles

“…The haploid chromosome number "n"-due to presence of two ploidy levels, "x" is the proper term-of big sagebrush has been intensively studied (Barker and McKell 1986;Kelsey and others 1975;others 1979, 1981;McArthur and Sanderson 1999;McArthur and Welch 1982;Sanderson and others 1989;Stahevitch and Wojtas 1988;Taylor and Brockman 1966;Taylor and others 1964;. The results of all these studies agree that the base number of chromosomes for big sagebrush is 9 (n = x = 9; fig.…”

“…5.2) and 2n = 4x = 36 ( fig. 5.3) (Barker and McKell 1986;Kelsey and others 1975;others 1979, 1981;McArthur and Sanderson 1999;Sanderson and others 1989;Stahevitch and Wojtas 1988;Taylor and Brockman 1966;Taylor and others 1964;). …”

Chromosome Numbers in Three Asteraceae Tribes from Inner Mongolia (China), with Genome Size Data for Cardueae

“…1b) Our own counts show a diploid cytotype (2n=18), and represents the first report of this ploidy level in Chinese populations of this species. Artemisia dracunculus is a well known species, largely distributed throughout Eurasia and reaching North America, (Suzuka 1950;Kurosawa 1971;Volkova and Boyko 1986;Xiong et al 1995;Matoba et al 2006Matoba et al , 2007 Artemisia eriopoda 36 (4x)* 2n=18 (Wang et al 2000) Artemisia frigida 18 (2x) 2n=18, 36, 54, 90 (Kawatani and Ohno 1964;Löve 1964, 1982;Knaben 1968;Kovanda 1972;Mulligan and Cody 1972;Hartman 1977;McArthur and Pope 1977;McArthur and Plummer 1978;Murray 1979, 1981;Keil and Pinkava 1979;Zhukova 1980;Korobkov 1981;Schweizer and Ehrendorfer 1983;Krogulevich and Rostovtseva 1984;Ward 1984;Mendelak and Schweizer 1986;Ward and Spellenberg 1986;Bakshi et al 1987;Stahevitch and Wojtas 1988;Yan et al 1989;Malakhova 1990;Qiao et al 1990;Hu et al 1991;Wang et al 2000;Garcia et al 2004 Artemisia lavandulifolia 18 (2x) 2n=18, 50, 54 (Volkova and Boyko 1989;Wang and Li 1995;Xiong et al 1995;Wang et al 2001;Hoshi et al 2003) Artemisia sieversiana 18 (2x) 2n=18 (Yan et al 1989;Qiao et al 1990;…”