Graft Compatibility Classification within Aurantioideae Based on Biometric Traits and the Anatomy of Graft Union

Citrus relatives are a relevant source of valuable traits for use in citrus breeding, including resistance to diseases such as Huanglongbing (HLB). Resistant rootstocks may impact tree responses HLB. This requires graft compatibility, which has been poorly investigated within the Aurantioideae. In this study, biometric characteristics and anatomy union 86 scion/rootstock combinations were assessed. comprised 18 genotypes/species 8 genera from Citrinae, Balsamocitrinae, Clauseninae subtribes sensu Swingle Reece. Most found be noncompatible. Phylogenetic proximity did not ensure successful grafting as, example, Orange jasmine autografts failed, whereas some intergeneric grafts (>60% graft-take). Plant scion height was directly related graft-take, but correlation between rootstock stem diameters reliable indicator compatibility. Rangpur/Tabog, Tabog/Rangpur, Wampee/Rangpur, Wampee/Pomeroy, Wampee/Swingle, Pomeroy/Wampee, Swingle/Wampee most compatible combinations. Graft-take success at similar levels those sweet orange grafted on common rootstocks. The position or combination affected performance specific genotypes tested. lack differentiation xylem-derived calli accumulation phenolic compounds clear anatomical biochemical markers, respectively, incompatibility Aurantioideae field, set ten promising combinations, Hamlin/Rangpur (control) only one that became infected by ‘Candidatus Liberibacter asiaticus’. first observed 12 months after planting. Overall, assessment allowed divided into four clusters, with respect their follows: fully high graft-take plant growth; potentially lower partially incompatible poor complete absence graft-take.