in recent years, shallow bark canker of walnut (juglandis regia l.) trees has become fairly widespread in iran. to determine the distribution of the disease in golestan, mazandaran and gilan provinces, from early summer to mid-fall seasons of 2004, more than one hundred bark samples were collected from walnut trees showing symptoms of shallow bark canker. sixty strains of bacteria were isolated...

AIMS We assessed the veracity of intergenic spacer region 1 (ITS1) ribotyping for the rapid, inexpensive and accurate identification of Brenneria goodwinii and Gibbsiella quercinecans that are associated with acute oak decline (AOD) in the UK. METHODS AND RESULTS Agarose gel electrophoresis and polyacrylamide gel electrophoresis (PAGE) were applied for the typing of ITS1 PCR amplicons from st...

Genetics and genomics in Brazil: a promising future Maria Rita Passos-Bueno, Debora Bertola, Dafne Dain Gandelman Horovitz, Victor Evangelista de Faria Ferraz & Luciano Abreu Brito Centro de Pesquisa sobre o Genoma Humano, Departamento de Gen etica e Biologia Evolutiva, Instituto de Biociências Universidade de S~ao Paulo, S~ao Paulo, Brazil Instituto da Crianc a do Hospital das Cl ınicas da Fac...

The lepidopteran family Lymantriidae contains about 200 genera and about 2,500 described species, mostly from the Old World Tropics (DeWorms, 1983). Of the 46 recognized species and subspecies of Lymantriidae in North America, 30% are considered pests (Ferguson, 1978). The pest species include three introduced species which have become established in North America, the gypsy moth, Lymantria dis...

Several bacterial pathogens produce diffusible signal factor (DSF)-type quorum sensing (QS) signals to control biofilm formation and virulence. Previous work showed that in Burkholderia cenocepacia the RpfFBc/RpfR system is involved in sensing and responding to DSF signals and that this signal/sensor gene pair is highly conserved in several bacterial species including Cronobacter spp. Here we s...

By using selective enrichment of polyhydroxyalkanoate-degrading bacteria and poly(3-hydroxyvalerate)-containing granules from Chromobacterium violaceum as the carbon source, 10 new Pseudomonas lemoignei strains were isolated; these strains were able to degrade poly(3-hydroxyvalerate), as well as poly(3-hydroxybutyrate), in vitro. The new isolates were characterized and identified by comparing t...

Deep Bark Canker (DBC), caused by the bacterium Brenneria rubrifaciens afflicts English walnut cultivars and is characterized by late onset of symptoms in trees greater than 15 years old. These symptoms include deep bleeding vertical cankers along the trunk and larger branches that exude a bacterial-laden reddish brown sap. B. rubrifaciens produces a unique water-soluble red pigment called rubr...