TY - JOUR
T1 - Polyploidy and new chromosome counts in Pseudognaphalium Kirp. (Compositae: Gnaphalieae)
AU - Acosta-Maindo, Adriel
AU - Hinojosa-Espinosa, Oscar
AU - Galbany-Casals, Mercè
PY - 2018/10/2
Y1 - 2018/10/2
N2 - © 2018, © 2018 Dipartimento di Biologia, Università di Firenze. Pseudognaphalium Kirp. (Compositae: Gnaphalieae) comprises approximately 90 species and it has a worldwide but fragmented distribution. This study provides a total of 20 chromosome counts, nine of which are the first report for a species, and the rest are confirmation of previous reports. With the addition of these data to the previously published reports, the chromosome numbers for a total of 32 species of the genus Pseudognaphalium are now available. Considering all chromosome data available at present, c.22% of the species are diploids and c.78% are polyploids, mainly tetraploids. African and Asian species are predominantly diploid whereas the vast majority of the American species are tetraploid, suggesting that polyploidy played a key role in the colonization of the American continent by the genus Pseudognaphalium.
AB - © 2018, © 2018 Dipartimento di Biologia, Università di Firenze. Pseudognaphalium Kirp. (Compositae: Gnaphalieae) comprises approximately 90 species and it has a worldwide but fragmented distribution. This study provides a total of 20 chromosome counts, nine of which are the first report for a species, and the rest are confirmation of previous reports. With the addition of these data to the previously published reports, the chromosome numbers for a total of 32 species of the genus Pseudognaphalium are now available. Considering all chromosome data available at present, c.22% of the species are diploids and c.78% are polyploids, mainly tetraploids. African and Asian species are predominantly diploid whereas the vast majority of the American species are tetraploid, suggesting that polyploidy played a key role in the colonization of the American continent by the genus Pseudognaphalium.
KW - America
KW - Asteraceae
KW - chromosome number
KW - Compositae
KW - Gnaphalieae
KW - polyploidy
KW - Pseudognaphalium
U2 - 10.1080/00087114.2018.1503501
DO - 10.1080/00087114.2018.1503501
M3 - Article
VL - 71
SP - 471
EP - 481
JO - Caryologia
JF - Caryologia
SN - 0008-7114
ER -