Olive is a fruit tree crop of great economic and social importance for Italy and it represents an important part of the Italian history, culture and landscape. Recently, a new olive disease termed olive quick decline syndrome (OQDS), associated to Xylella fastidiosa subspecies pauca. (Xfp), is causing major devastation in the olive groves of the Salento peninsula. The most widespread olive cultivars in this area are Ogliarola salentina and Cellina di Nardò, that show high susceptibility to the disease. The current unavailability of effective treatments to cure Xylella-infected trees, poses major challenges for agronomic sustainability of olive crop in infected areas. Now, only Leccino and Fs-17® cultivars showed genetic resistance to the Xfp. The research for genetic traits of resistance among the very large number of Italian olive cultivars, may represent one of the most effective and medium term strategies to control the impact of this detrimental disease. Moreover, recent surveys in the infected area allowed the identification of some Apulian undescribed genotypes and wild olives showing interesting phenotypic behavior. For this purpose, nine preselected nuclear microsatellite markers were used to assess the genotypic profiles of these accessions, and their relationships with national olive cultivars. The combination of the SSRs allowed to identify different unique genetic profiles, and to speculate about their potential parents. The Strcuture and DAPC Analysis highlighted a divergence of the Apulian genotypes from the Italian clade, and a sub-clustering according to the region of origin. These results were supported from the dendrogram obtained by Neighbor-Joining clustering method.
GENETIC CHARACTERIZATION OF APULIAN OLIVE GERMPLASM AS POTENTIAL SOURCE OF RESISTANCE TO XYLELLA FASTIDIOSA PAUCA
SION S.;MIAZZI M. M.;CAMPOSEO S.;FALCO V.;PAVAN S.;TARANTO F.;MONTEMURRO C.
2019-01-01
Abstract
Olive is a fruit tree crop of great economic and social importance for Italy and it represents an important part of the Italian history, culture and landscape. Recently, a new olive disease termed olive quick decline syndrome (OQDS), associated to Xylella fastidiosa subspecies pauca. (Xfp), is causing major devastation in the olive groves of the Salento peninsula. The most widespread olive cultivars in this area are Ogliarola salentina and Cellina di Nardò, that show high susceptibility to the disease. The current unavailability of effective treatments to cure Xylella-infected trees, poses major challenges for agronomic sustainability of olive crop in infected areas. Now, only Leccino and Fs-17® cultivars showed genetic resistance to the Xfp. The research for genetic traits of resistance among the very large number of Italian olive cultivars, may represent one of the most effective and medium term strategies to control the impact of this detrimental disease. Moreover, recent surveys in the infected area allowed the identification of some Apulian undescribed genotypes and wild olives showing interesting phenotypic behavior. For this purpose, nine preselected nuclear microsatellite markers were used to assess the genotypic profiles of these accessions, and their relationships with national olive cultivars. The combination of the SSRs allowed to identify different unique genetic profiles, and to speculate about their potential parents. The Strcuture and DAPC Analysis highlighted a divergence of the Apulian genotypes from the Italian clade, and a sub-clustering according to the region of origin. These results were supported from the dendrogram obtained by Neighbor-Joining clustering method.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
