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Moody Hooper postete ein Update vor 11 Monaten, 3 Wochen
Though information exists regarding the pathogenesis of the shot-hole disease (SH) in flowering cherry (FC), there has been a lack of research focusing on SH management. Therefore, here, we investigated the inhibitory activities of antagonistic bacteria against SH pathogens both in vitro and in vivo as well as their biochemical characteristics and bioactive compounds. Two biosurfactant-producing bacterial antagonists, identified as Bacillus velezensis strains JCK-1618 and JCK-1696, exhibited the best effects against the growth of both bacterial and fungal SH pathogens in vitro through their cell-free culture filtrates (CFCFs). These two strains also strongly inhibited the growth of the pathogens via the action of their antimicrobial diffusible compounds and antimicrobial volatile organic compounds (VOCs). Crude enzymes, solvent extracts, and biosurfactants of the two strains exhibited antimicrobial activities. Liquid chromatography/electrospray ionization time-of-flight mass spectrometric analysis of the partially purified active fractions revealed that the two antagonists produced three cyclic lipopeptides, including iturin A, fengycin A, and surfactin, and a polyketide, oxydifficidin. In a detached leaf assay, pre-treatment and co-treatment of FC leaves with the CFCFs led to a large reduction in the severity of the leaf spots caused by Epicoccum tobaicum and Bukholderia contaminans, respectively. In addition, the two antagonists produced indole-3-acetic acid, siderophore, and a series of hydrolytic enzymes, along with the formation of a substantial biofilm. To our knowledge, this is the first report of the antimicrobial activities of the diffusible compounds and VOCs of B. velezensis against the SH pathogens and their efficiency in the biocontrol of SH.Pectobacterium carotovorum subsp. carotovorum (Pcc) is a gram-negative, broad host range bacterial pathogen which causes soft rot disease in potatoes as well as other vegetables worldwide. While Pectobacterium infection relies on the production of major cell wall degrading enzymes, other virulence factors and the mechanism of genetic adaptation of this pathogen is not yet clear. In the present study, we have performed an in-depth genome-wide characterization of Pcc strain ICMP5702 isolated from potato and compared it with other pathogenic bacteria from the Pectobacterium genus to identify key virulent determinants. The draft genome of Pcc ICMP5702 contains 4,774,457 bp with a G + C content of 51.90% and 4,520 open reading frames. Genome annotation revealed prominent genes encoding key virulence factors such as plant cell wall degrading enzymes, flagella-based motility, phage proteins, cell membrane structures, and secretion systems. Whereas, a majority of determinants were conserved among the Pectobacterium strains, few notable genes encoding AvrE-family type III secretion system effectors, pectate lyase and metalloprotease in addition to the CRISPR-Cas based adaptive immune system were uniquely represented. Overall, the information generated through this study will contribute to decipher the mechanism of infection and adaptive immunity in Pcc.Pathogenicity of eight Bacillus strains to seedlings of four cotton cultivars was evaluated under greenhouse conditions. Each of the tested cultivars was individually treated with powdered inoculum of each bacterial strain. Untreated seeds were planted as control treatments in autoclaved soil. Effects of the tested strains on levels and activities of some biochemical components of the infected seedlings were also assayed. The biochemical components included total soluble sugars, total soluble proteins, total free amino acids, peroxidase, polyphenol oxidase, phenols, and lipid peroxidation. ANOVA showed that Bacillus strain (B) was a very highly significant source of variation in damping-off and dry weight. Cotton cultivar (V) was a nonsignificant source of variation in damping-off while it was a significant source of variation in dry weight. B × V interaction was a significant source of variation in damping-off and a nonsignificant source of variation in dry weight. Bacillus strain was the most important source of variation as it accounted for 59.36 and 64.99% of the explained (model) variation in damping-off and dry weight, respectively. The lack of significant correlation between levels and activities of the assayed biochemical components and incidence of damping-off clearly demonstrated that these biochemical components were not involved in the pathogenicity of the tested strains. Therefore, it was hypothesized that the pathogenicity of the tested strains could be due to the effect of cell wall degrading enzymes of pathogenic toxins. Based on the results of the present study, Bacillus strains should be considered in studying the etiology of cotton seedling damping-off.Phaeosphaeria species are pathogenic on wheat, barley and a wide range of wild grasses. To analyze mating type loci of the Phaeosphaeria species and investigate mating type distribution in Iran, we sequenced mating type loci of 273 Phaeosphaeria isolates including 67 isolates obtained from symptomatic leaves and ears of wheat, barley, and wild grasses from two wheat-growing region in Iran as well as 206 isolates from our collection from other regions in Iran which were isolated in our previous studies. Mating type genes phylogeny was successfully used to determine the species identity and relationships among isolates within the Phaeosphaeria spp. complex. In this study, we reported seven new host records for Phaeosphaeria species and the Phaeosphaeria avenaria f. sp. tritici 3 group was first reported from Iran in this study. Mating type distribution among Phaeosphaeria species was determined. Both mating types were present in all sampling regions from Iran. We observed skewed distribution of mating types in one region (Kohgiluyeh va Boyer-Ahmad) and equal distribution in the other region (Bushehr). However, when considering our entire dataset of 273 Iranian Phaeosphaeria isolates, the ratio of mating types was not deviated significantly from 11 suggesting possibilities for isolates of opposite mating type to interact and reproduce sexually, although the sexual cycle may infrequently occur in some regions especially when the climatic conditions are unfavorable for teleomorph development.The global nematicides market is expected to continue growing. With an increasing demand for synthetic chemical-free organic foods, botanical nematicides are taking the lead as replacements. Consequently, in the recent years, there have been vigorous efforts towards identification of the active secondary metabolites from various plants. These include mostly glucosinolates and their hydrolysis products such as isothiocyanates; flavonoids, alkaloids, limonoids, quassinoids, saponins, and the more recently probed essential oils, among others. And despite their overwhelming potential, variabilities in quality, efficacy, potency and composition continue to persist, and commercialization of new botanical nematicides is still lagging. Molidustat Herein, we have reviewed the history of botanical nematicides and regional progresses, the potency of the identified phytochemicals from the key important plant families, and deciphered some of the impediments involved in standardization of the active compounds in addition to the concerns over the safety of the purified compounds to non-target microbial communities.
Non-cleft craniofacial anomalies are not as common as cleft lip and palate but resultant disability can be very severe. Although there are epidemiological studies of the clefts in the medical literature, the non-cleft group is still not well known. This study was to examine the epidemiological characteristics of the non-cleft craniofacial anomalies. Patients younger than 18 years old were included during a 1-year period. Patient information was retrieved from medical records and a questionnaire filled by primary caregivers.There were 139 patients included in the study with an average age of 6 years and 7 months (4-194 months). Fifty-eight percent were male, 56% were first-born children, whereas 61.9% had siblings. Family history was positive in 6.5%. Almost all patients were in age-appropriate educational levels. Using Whitaker classification, Synostoses was the most common at 48.9%, followed by Unclassified, Clefts, Neoplasia-Hyperplasia, and Atrophy-Hypoplasia. Their anomalies were mostly detected at the per care and education. Having a child with an anomaly did not discourage the family from having more descendants. Among the available classifications, the Whitaker system is easier for clinical use.
Sinonasal tumors invading anterior skull base is difficult to treat in Otorhinolaryngology and Neurosurgery. Treatment requires the collaboration of ear, nose and throat (ENT) and neurosurgeon to remove the tumor completely. This study was to evaluate the outcome of combined technique nasal endoscopic and subfrontal approach in case of sinonasal tumors involving anterior skull base.
Retrospective cross-sectional study.
The study was a cross-sectional study that had taken place at Otorhinolaryngology and Neurosurgery Department of Cho Ray Hospital, Vietnam. All 45 patients were enrolled and underwent the surgery. 71.1% of these cases were malignant tumors. The ratio of sinonasal malignant tumor is squamous cell carcinoma and esthesioneuroblastoma were 24.4% and 11.1%, respectively. All the cases were diagnosed as sinonasal tumor invading anterior skull base and successfully removed by combining nasal endoscopic approach with subfrontal craniotomy.
The combined nasal endoscopic with subfrontal craniotomy for resection nasoethmoid tumor invading the brain show a good result. This technique is an important adjunct that contribute to the treatment of anterior skull base tumor involving the brain.
The combined nasal endoscopic with subfrontal craniotomy for resection nasoethmoid tumor invading the brain show a good result. This technique is an important adjunct that contribute to the treatment of anterior skull base tumor involving the brain.
Metopic craniosynostosis is a condition in which the metopic suture is prematurely fused. Trigonocephaly and hypotelorism are the major abnormal findings associated with synostosis. Fronto-orbital advancement with cranial remodelling procedure is the widely practised method for correction of the deformities. Previously, a few studies have shown a low incidence of secondary raised intracranial pressure after the primary surgery. Thus, we reviewed our database to investigate the outcomes of metopic craniosynostosis treatment between 1999 and 2020 in Cleft and Craniofacial South Australia. One hundred twelve patients (77 males and 35 females) with metopic synostosis were operated. The mean age of primary surgery was 11.1 months (range 2.8-131.7 months). Ten patients (9%) who had secondary raised intracranial pressure underwent secondary surgery. Among those, the mean age of primary and secondary surgery were 5.4 and 57.1 months, respectively. Syndromic patients were significantly revealed to have a higher inciranial pressure. The patients who had raised intracranial pressure tended to have primary correction at younger age. Long-term multidisciplinary follow-up is mandatory. The demand for secondary surgery for metalwork complications or cosmetic contouring is uncommon.