Xanthomonas perforans and X. gardneri associated with bacterial leaf spot on weeds in Brazilian tomato fields

Abstract

Several species of Xanthomonas cause bacterial leaf spot, a disease that affects solanaceous crops worldwide. The diversity of 64 Australian isolates of Xanthomonas spp. associated with bacterial leaf spot in tomato, capsicum and chilli crops in eastern Australia was determined using multi-locus sequence analysis of atpD, dnaK, efp and gyrB genes, species-specific PCR assays and biochemical analyses. At least five species of Xanthomonas associated with bacterial leaf spot were identified in Australian tomato, capsicum and chilli crops and their pathogenicity assessed. Phylogenetic and biochemical analyses identified X. euvesicatoria, X. perforans and X. vesicatoria as the most frequently recovered pathogenic species. Non-pathogenic and weakly pathogenic species were also identified. The suitability of the identification methods used and the implications of the detection of these species will be discussed.

Occurrence and Characterization of the Bacterial Spot Pathogen Xanthomonas euvesicatoria on Pepper in Iran

“…; Araújo et al. ). Indeed, some non‐solanaceous crops and weeds have been reported as survival sources of the bacterial spot pathogen (Jones et al.…”

“…; Araújo et al. ). Recently, three naturally growing weed species – Nicandra physaloides and Solanum americanum (both Solanaceae ), and Euphorbia heterophylla ( Euphorbiaceae ) – in tomato commercial fields in Brazil were found to be infected with X. perforans and X. gardneri (Araújo et al.…”

“…Several authors have highlighted the role of alternative host/non-host plants on the survival, distribution and epidemiological development of bacterial pathogens (Toussaint et al 2012;Ara ujo et al 2015). Indeed, some non-solanaceous crops and weeds have been reported as survival sources of the bacterial spot pathogen (Jones et al 1986;Ara ujo et al 2015).…”

“…Several authors have highlighted the role of alternative host/non-host plants on the survival, distribution and epidemiological development of bacterial pathogens (Toussaint et al 2012;Ara ujo et al 2015). Indeed, some non-solanaceous crops and weeds have been reported as survival sources of the bacterial spot pathogen (Jones et al 1986;Ara ujo et al 2015). Recently, three naturally growing weed species -Nicandra physaloides and Solanum americanum (both Solanaceae), and Euphorbia heterophylla (Euphorbiaceae) in tomato commercial fields in Brazil were found to be infected with X. perforans and X. gardneri (Ara ujo et al 2015).…”

“…Indeed, some non-solanaceous crops and weeds have been reported as survival sources of the bacterial spot pathogen (Jones et al 1986;Ara ujo et al 2015). Recently, three naturally growing weed species -Nicandra physaloides and Solanum americanum (both Solanaceae), and Euphorbia heterophylla (Euphorbiaceae) in tomato commercial fields in Brazil were found to be infected with X. perforans and X. gardneri (Ara ujo et al 2015). Some other weeds such as Physalis pubescens (Solanaceae) have also been described as survival sources of bacterial spot pathogen in the field (Jones et al 1986).…”