Etude cytotaxonomique des espèces et des hybrides naturels du genreDrosera (Droseraceae)au Québec

Abstract

anglica is an amphiploid resulting from the chromosome doubling of the sterile linearis x rotundifolia hybrid. The meiotic pairing configurations observed in a linearis x anglica (2n = 30) hybrid suggest however that the process must have taken place with a primitive D. linearis somewhat different from the present species. D. /inearis is a species with narrow ecological requirements whose northeastern American lineage with some isolated western populations alone subsist and need protection.

Effects of genome composition on phenotypic plasticity and secondary metabolites in the amphidiploid species <i>Drosera tokaiensis</i> and its parent species under different monochromatic lighting

“…The chromosome numbers and genome sizes that could reliably distinguish D. tokaiensis from its parent species were consistent with our results and those of previous studies using the same strains (Hoshi and Kondo 1998, Hoshi et al 2017. Except for two reports of 2n=72 counted by Heitz (1926) for D. spatulata and 2n= 43 counted by Kondo (1973) as meiotic irregularity in an artificial hybrid, all recorded chromosome numbers in the series Eurossolis (Diels 1906) to which these species belong have a neat multiplicity of basic chromosome number x=10 (Wood 1955, Kondo 1971, Kondo and Segawa 1988, Hoshi and Kondo 1998, Gervais and Gauthier 1999, Shirakawa et al 2011, Hoshi et al 2017. Hence, D. rotundifolia (2n=20), D. spatulata (2n= 40), and D. tokaiensis (2n= 60) are diploid (2x), tetraploid (4x) and hexaploid (6x), respectively.…”