HSU, S., and R. N. GOODMAN. 1978. Production of host-specific, wilt-inducing toxin in apple cell suspension cultures inoculated with Erwinia amylovora. Phytopathology 68: 351-354. A wilt-inducing toxin was detected in filtrates prepared of the virulent bacteria paralleled production of the toxin in from apple cell suspension cultures (ACSC) which had been the suspension cultures. The virulent s...

Erwinia amylovora, a Gram negative bacteria of the Enterobacteriaceae family, is the causal agent of fire blight, a devastating plant disease affecting a wide range of host species within Rosaceae and a major global threat to commercial apple and pear production. Among the limited number of control options currently available, prophylactic application of antibiotics during the bloom period appe...

A 125-member library of synthetic linear undecapeptides was prepared based on a previously described peptide H-K(1)KLFKKILKF(10)L-NH(2) (BP76) that inhibited in vitro growth of the plant pathogenic bacteria Erwinia amylovora, Xanthomonas axonopodis pv. vesicatoria, and Pseudomonas syringae pv. syringae at low micromolar concentrations. Peptides were designed using a combinatorial chemistry appr...

Obligate bacterial symbionts are widespread in many invertebrates, where they are often confined to specialized host cells and are transmitted directly from mother to progeny. Increasing numbers of these bacteria are being characterized but questions remain about their population structure and evolution. Here we take a comparative genomics approach to investigate two prominent bacterial symbion...

Sirtuins are NAD(+)-dependent protein deacylases that are conserved in all domains of life and are involved in diverse cellular processes, including control of gene expression and central metabolism. Eukaryotic sirtuins have N-terminal extensions that have been linked to protein multimerization and cellular localization. Here the first evidence of sirtuin isoforms in bacteria is reported. The e...

Fire blight, caused by epiphytotic gram-negative bacteria Erwinia amylovora, is the most destructive bacterial disease of apple (Malus spp.). Genetic mechanisms fire blight resistance have mainly been studied using traditional biparental quantitative trait loci (QTL) mapping approaches. Here, we use large-scale historic shoot and blossom data collected over multiple years genotyping-by-sequenci...

ABSTRACT Phytosanitary concerns about fire blight prohibit export of U.S.-grown pears to some countries without this disease. To examine these concerns, we evaluated the potential for co-occurrence of Erwinia amylovora with mature, symptomless winter pear fruit by inoculation experiments and by survey of commercial orchards. Immature pear and apple fruit were inoculated in orchards with E. amyl...

Endophytic fungi live in inter-cellular spaces of healthy plant tissues without causing any apparent symptoms diseases for the host plant. Some fungal endophytes help their hosts to survive under biotic and abiotic stresses. In this study, we collected mango leaves at Honghe plantations (Yunnan Province) winter. A total 34 different endophytic strains were isolated, phylogenetic placements esti...