Bielsa Pérez, BeatrizBasset, CaroleGlenn, D. MichaelRubio Cabetas, María José2018-05-152018-05-152018Agronomy, 8(4), (2018)http://hdl.handle.net/10532/4034In order to improve the effectiveness of breeding practices for Prunus rootstocks, it is essential to obtain new resistance resources, especially with regard to drought. In this study, a collection of field-grown Prunus genotypes, both wild-relative species and cultivated hybrid rootstocks, were subjected to leaf ash and carbon isotope discrimination (∆ 13C) analyses, which are strongly correlated to water use efficiency (WUE). Almond and peach wild relative species showed the lowest ∆ 13C ratios, and therefore, the highest WUE in comparison with hybrid genotypes. In addition, drought-related cis-regulatory elements (CREs) were identified in the promoter regions of the effector gene PpDhn2, and the transcription factor gene DREB2B, two genes involved in drought-response signaling pathways. The phylogenetic analysis of these regions revealed variability in the promoter region sequences of both genes. This finding provides evidence of genetic diversity between the peach- and almond-relative individuals. The results presented here can be used to select Prunus genotypes with the best drought resistance potential for breeding.enAtribución-NoComercial-SinDerivadas 3.0 EspañaJournal ContributionPrunusPrunus persicaVariedadesRizomasEficacia en el uso del agua