Changes in physicochemical properties and microbial community succession during leaf stacking fermentation.

Leaf stacking fermentation involves enzymatic actions of many microorganisms and is an efficient and environmentally benign process for degrading macromolecular organic compounds. We investigated the dynamics of metabolite profiles, bacterial and fungal communities and their interactions during fermentation using cigar leaves from three geographic regions. The results showed that the contents of total sugar, reducing sugar, starch, cellulose, lignin, pectin, polyphenol and protein in cigar tobacco leaves was significantly decreased during fermentation.

Proposal to classify phylotype I strains as sp. nov., and a genomic comparison between members of the genus .

A Gram-negative, aerobic, rod-shaped, motile bacterium with multi-flagella, strain RS, was isolated from bacterial wilt of tobacco in Yuxi city of Yunnan province, China. The strain contains the major fatty acids of C, summed feature 3 (C 7 and/or C 6), and summed feature 8 (C 7 and/or C 6). The polar lipid profile of strain RS consists of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and unidentified aminophospholipid.

sp. nov., a novel bacterium isolated from a tobacco field in Yunnan, China.

A Gram-negative, aerobic, motile with paired polar flagella and rod-shaped bacterium strain (56D2) was isolated from tobacco planting soil in Yunnan, PR China. Major fatty acids were C 7 (summed feature 3), C and C  7 (summed feature 8). The polar lipid profile of strain 56D2 consisted of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, one unidentified aminophospholipid and one unidentified glycolipid.

First report of Tobacco Fusarium Root Rot Caused by Fusarium meridionale in China.

Tobacco (Nicotiana tabacum L.) was an important economic crop in China. A survey in Yunnan Province in the last several years showed that the incidence of tobacco root rot was 3 to 30%.

sp. nov. a novel phytopathogenic bacterium isolated from black spots of tobacco.

Three Gram-stain-negative, motile, with amphilophotrichous flagella, and rod-shaped bacteria (LJ1, LJ2 and LJ3) were isolated from lower leaves with black spots on flue-cured tobacco in Yunnan, PR China. The results of phylogenetic analysis based on 16S rRNA gene sequences indicate that all the strains from tobacco were closely related to the type strains of the group within the lineage and LJ2 has the highest sequence identities with DSM 50259 (99.92 %), Pc19-1 (99.

First Report of Causing Stem Rot of Tobacco in China.

Tobacco is one of the most significant non-food cash crops (Lu et al. 2020). In March 2022, cigar tobacco plants showing characteristic symptoms of vascular discoloration, stem rotting, leaf wilting and rotting were observed in Tengchong city (N 25°3'26″, E 98°25'6″) of Yunnan province, China (Fig.

Tobacco leaf curl Puer virus: a novel monopartite begomovirus infecting Nicotiana tabacum in China.

Begomoviruses (family Geminiviridae) cause serious diseases in many crops. In this study, we characterized a begomovirus isolated from a tobacco plant with leaf curl in Puer, Yunnan Province, China. Analysis of the viral genome obtained from a symptomatic Nicotiana tabacum plant showed that it belonged to a novel monopartite begomovirus.

NtSWEET1 promotes tobacco resistance to Fusarium oxysporum-induced root rot disease.

Sugars Will Eventually be Exported Transporter (SWEET) is a newly characterized family of sugar transporters, which plays critical roles in plant-pathogen interactions. However, the function of SWEET in tobacco and its interaction with , a causal agent of root rot, remain unclear. This study aimed to dissect the function of NtSWEETs in tobacco root rot using stem bases from tobacco plants inoculated with .

Highly sensitive time-resolved fluoroimmunoassay for the quantitative onsite detection of Alternaria longipes in tobacco.

Aims: Alternaria longipes is a causal agent of brown spot of tobacco, which remains a serious threat to tobacco production. Herein, we established a detection method for A. longipes in tobacco samples based on the principle of time-resolved fluoroimmunoassay, in order to fulfil the requirement of rapid, sensitive and accurate detection in situ.

Fic Proteins Inhibit the Activity of Topoisomerase IV by AMPylation in Diverse Bacteria.

The Fic (filamentation induced by cyclic AMP) domain is a widely distributed motif with a conserved sequence of HPFx[D/E]GN[G/K]R, some of which regulate cellular activity by catalyzing the transfer of the AMP moiety from ATP to protein substrates. Some Fic proteins, including Fic-1 from the soil bacterium strain 2P24, have been shown to inhibit bacterial DNA replication by AMPylating the subunit B of DNA gyrase (GyrB), but the biochemical activity and cellular target of most Fic proteins remain unknown. Here, we report that Fic-2, which is another Fic protein from strain 2P24 and Fic-1 AMPylate the topoisomerase IV ParE at Tyr.

AidB, a Novel Thermostable -Acylhomoserine Lactonase from the Bacterium sp.

Many Gram-negative bacteria employ -acylhomoserine lactones (AHLs) as quorum-sensing (QS) signal molecules to regulate virulence expression in a density-dependent manner. Quorum quenching (QQ) via enzymatic inactivation of AHLs is a promising strategy to reduce bacterial infections and drug resistance. Herein, a thermostable AHL lactonase (AidB), which could degrade different AHLs, with or without a substitution of carbonyl or hydroxyl at the C-3 position, was identified from the soil bacterium sp.