Reproductive barriers to interspecific Corymbia hybridization

Reproductive barriers to interspecific <i>Corymbia</i> hybridization

Reproductive bar­ri­ers to inter­spe­cific Corymbia hybridization

Corymbia spe­cies have a high propensity to form inter­spe­cific hybrids. Dickinson et al. invest­ig­ate the loc­a­tions and activ­ity of repro­duct­ive isol­at­ing bar­ri­ers between spe­cies, and identify pre-zygotic bar­ri­ers as the main mech­an­isms for repro­duct­ive isol­a­tion. Crossing Corymbia torel­liana with 14 Corymbia taxa and single spe­cies from related Angophora and Eucalyptus, they find repro­duct­ive suc­cess decreases with increas­ing taxo­nomic dis­tance between par­ent spe­cies. The find­ings sup­port the mono­phyly of Corymbia and the close rela­tion­ships of infra­gen­eric clades. The hybrid­iz­ing propensity of Corymbia spe­cies provides oppor­tun­it­ies for forestry breed­ing but sug­gests risks of envir­on­mental gene flow.

Annals of Botany Office.

The Annals of Botany Office is based at the University of Leicester.