First Report of Pseudomonas Grapevine Bunch Rot Caused by Pseudomonas syringae pv. syringae .

Pseudomonas syringae pv. syringae, a Gammaproteobacterium belonging to genomospecies 2 within the P. syringae complex, is distributed worldwide, and it is responsible for bacterial canker on >100 different hosts, including the grapevine. P. syringae pv. syringae induces necrotic lesions in the leaf blades, veins, petioles, shoots, rachis, and tendrils on grapevine cultivars in different areas. P. syringae pv. syringae has been associated with severe economic losses in different grape cultivars in Australia, where it causes inflorescence rot. In midsummer to late summer 2017, symptoms of berry rots differing from those caused by the common berry rots agents were observed in different cultivar Red Globe vineyards of Apulia (southern Italy). As proven by fulfillment of Koch's postulates, these symptoms were caused by a bacterium that, according to the results of biochemical, physiological, nutritional, antimicrobial activity, and pathogenicity tests and sequencing of 16S ribosomal DNA, gyrB, rpoB, and rpoD genes, was identified as P. syringae pv. syringae. This is the first report of Pseudomonas grapevine bunch rot

Nanoemulsion of Minthostachys verticillata essential oil. In-vitro evaluation of its antibacterial activity

Infectious diseases constitute a problem of great importance for animal and human health, as well as the increasing bacterial resistance to antibiotics. In this context, medicinal plants emerge as an effective alternative to replace the use antibiotics. The essential oil (EO) of Minthostachys verticillata (Griseb.) Epling (Lamiaceae) has demonstrated a strong antimicrobial activity. However, its instability and hydrophobicity under normal storage conditions are limitations to its use. Nanoemulsion technology is an excellent way to solubilize, microencapsulate, and protect this compound. This study aimed to obtain a nanoemulsion based on M. verticillata EO and evaluate its antibacterial activity against Staphylococcus aureus. The EO was obtained by steam distillation. Identification and quantification of their components were determined by GC-MS revealing that the dominated chemical group was oxygenated monoterpenes. Nanoemulsions (NE) were characterized by measuring pH, transmittance, separation percentage, release profile, and morphology. The effect of NE on the growth of S. aureus and cyto-compatibility was also evaluated. The results showed that NE containing a higher percentage of tween 20 exhibited higher stability with an approximated droplet size of 10 nm. The effect of encapsulation process was evaluated by GC-MS revealing that the volatile components in EO were no affected. After 24 h, 74.24 ± 0.75% of EO was released from NE and the antibacterial activity of EO was enhanced considerably by its encapsulation. The incubation of S. aureus with the NE and pure EO, show a bacterial growth inhibition of 58.87% ± 0.99 and 46.72% ± 3.32 (p < 0.05), respectively. In addition, nanoemulsión did not cause toxicity to porcine and equine red blood cells. The results obtained showed that NE could be a potential vehicle for M. verticillata EO with promissory properties to emerge as a tool for developing advanced therapies to control and combat infections.EEA Marcos JuárezFil: Cecchini, María Eugenia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Físico-Químicas y Naturales. Departamento de Microbiología e Inmunología. Laboratorio de Inmunología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biotecnología Ambiental y Salud. Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud; ArgentinaFil: Paoloni, C. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria. Departamento de Anatomía Animal. Laboratorio de Biotecnología Animal; ArgentinaFil: Campra, Noelia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Físico-Químicas y Naturales. Departamento de Microbiología e Inmunología. Laboratorio de Inmunología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biotecnología Ambiental y Salud. Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud; ArgentinaFil: Picco, Natalia. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria. Departamento de Anatomía Animal. Laboratorio de Biotecnología Animal; ArgentinaFil: Grosso, M. Carolina. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria. Departamento de Anatomía Animal. Laboratorio de Biotecnología Animal; ArgentinaFil: Soriano Perez, María Laura. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez; ArgentinaFil: Alustiza, Fabrisio Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez; ArgentinaFil: Cariddi, Noelia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Físico-Químicas y Naturales. Departamento de Microbiología e Inmunología. Laboratorio de Inmunología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biotecnología Ambiental y Salud. Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud; ArgentinaFil: Bellingeri, Romina. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria. Departamento de Anatomía Animal. Laboratorio de Biotecnología Animal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. Universidad Nacional de Río Cuarto. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentin

A severe outbreak of bacterial lettuce soft rot caused by pectobacterium carotovorum subsp. carotovorum in Apulia (Italy)

A severe bacterial disease was observed in lettuce plants during surveys carried out in the province of Bari (Apulia, Italy). Symptoms were chlorosis and wilting of older leaves, water-soaked and dark green soft rot of the pith. Several bacterial isolates were obtained from the affected plants by isolations on semi-selective crystal violet pectate agar medium. Biochemical, nutritional, and athogenicity tests identified them as Pectobacterium carotovorum subsp. carotovorum. The nutritional profile obtained using the Biolog system and the 434 bp product amplifìed by PCR using primers designed on P. carotovorum pectate lyase-encoding gene sequence further confirmed the identity of the isolates. Some epidemiological aspects of the pathogen and the main measures to prevent and control the disease are reported

Una grave manifestazione di "Macchiettatura" batterica del pomodoro in Puglia

Informatore agrario codice E10194