Home 9 Outcomes 9 Publications 9 Parallel host shifts in a bacterial plant pathogen suggest independent genetic solutions

Parallel host shifts in a bacterial plant pathogen suggest independent genetic solutions

Authors: Monica A. Donegan, Helvécio D. Coletta-Filho, Rodrigo P. P. Almeida
Date Published: 29/03/2023
Via: BSPP
Keywords: Genomic

Abstract

While there are documented host shifts in many bacterial plant pathogens, the genetic foundation of host shifts is largely unknown. Xylella fastidiosa is a bacterial pathogen found in over 600 host plant species. Two parallel host shifts occurred—in Brazil and Italy—in which X. fastidiosa adapted to infect olive trees, whereas related strains infected coffee. Using 10 novel whole-genome sequences from an olive-infecting population in Brazil, we investigated whether these olive-infecting strains diverged from closely related coffee-infecting strains. Several single-nucleotide polymorphisms, many derived from recombination events, and gene gain and loss events separated olive-infecting strains from coffee-infecting strains in this clade. The olive-specific variation suggests that this event was a host jump with genetic isolation between coffee- and olive-infecting X. fastidiosa populations. Next, we investigated the hypothesis of genetic convergence in the host shift from coffee to olive in both populations (Brazil and Italy). Each clade had multiple mutations and gene gain and loss events unique to olive, yet no overlap between clades. Using a genome-wide association study technique, we did not find any plausible candidates for convergence. Overall, this work suggests that the two populations adapted to infect olive trees through independent genetic solutions.

Complete circularized genome resources for Xylella fastidiosa subsp. sandyi strains CO33 and CFBP8478

Authors: María Pilar Velasco-Amo, Luis F. Arias-Giraldo, Miguel Román-Écija, Annalisa Giampetruzzi, Maria Saponari, and Blanca B. Landa

Date: 04/03/24

Xylella fastidiosa (Xf) is a vascular phytopathogenic bacterium native to the Americas, known for causing severe diseases and significant economic losses in important crops. In Europe, Xf is considered a quarantine pathogen. Since its first detection in 2013 in Italy,...

Complete circularized genome resources for Xylella fastidiosa subsp. sandyi strains CO33 and CFBP8478

Authors: María Pilar Velasco-Amo, Luis F. Arias-Giraldo, Miguel Román-Écija, Annalisa Giampetruzzi, Maria Saponari, and Blanca B. Landa

Date: 04/03/24

Xylella fastidiosa (Xf) is a vascular phytopathogenic bacterium native to the Americas, known for causing severe diseases and significant economic losses in important crops. In Europe, Xf is considered a quarantine pathogen. Since its first detection in 2013 in Italy,...

Genealogical tracing of Olea europaea species and pedigree relationships of var. europaea using chloroplast and nuclear markers

Authors: Roberto Mariotti, Angjelina Belaj, Raúl de la Rosa, Rosario Muleo, Marco Cirilli, Ivano Forgione, Maria Cristina Valeri & Soraya Mousavi

Date: 26/09/23

Background Olive is one of the most cultivated species in the Mediterranean Basin and beyond. Despite being extensively studied for its commercial relevance, the origin of cultivated olive and the history of its domestication remain open questions. Here, we present a...