FERRUCCI maria silvia
Genome Size Variation Between the Native and Invasive Ranges of Senecio madagascariensis (Asteraceae)
DEMATTEIS, B.; FERRUCCI, MARÍA SILVIA; ORTEGA-BAES, P.; COULLERI, J.P.
AMER SOC PLANT TAXONOMISTS
Lugar: Laramie; Año: 2020 vol. 45 p. 212 - 218
Invasive speciesmust colonize new habitats away from their native range; therefore, factorsaffecting plant dispersal play a key role in invasion. The ploidy level andgenome size (or Cx value) can affect the dispersal traits, physiology, andecology of invasive species over a few generations, generating individuals thatcan face fluctuating environments, exploit new ones, and compete with nativespecies. Several studies have demonstrated that invasive species tend to havesmaller genomes than their noninvasive congeners, which is explained by therole that the Cx value plays in phenotypic evolution and ecological tolerance.In order to test this hypothesis, we compare the genome size variation inArgentine populations (invasive range) vs. South African populations (nativerange) of S. madagascariensis. To meet our goals, we estimated the Cx value of invasivepopulations collected on field trips, while for native populations weconsidered available published data. We extracted the bioclimatic variables inorder to establish the ecological amplitude in which the genome sizes may bedistributed. Our results evidenced larger genomes in the invasive range than inthe native one. Furthermore, we propose that large genomes of the invasivepopulations could be mainly explained by the founder genotypes effect and theanthropogenic introduction of this species to Argentina. In addition, wedemonstrated that genotypes with big genomes can tolerate differentenvironmental conditions from those of their native range. Therefore, theycould present a greater ability for colonizing new environments. Theimplications and importance of ploidy level in the invasion of S.madagascariensis are discussed.