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PubMed2026

Isolation and characterization of two novel species Neorhizobium fuzhouense sp. nov. and Neotabrizicola paludis sp. nov.

Two novel aerobic bacterial strains, designated SGZ-38T and sgz301269T, were isolated from the root of Pennisetum sp. and paddy soil, respectively. Strain SGZ-38T grew at 10-40 ℃ (optimum 30 °C) and pH 5.0-12.0 (optimum 6.5) and tolerated up to 1.0% NaCl (w/v), whereas strain sgz301269T grew at 15-37 °C (optimum 30 °C), pH 5.0-9.5 (optimum 7.0) and 0-2% NaCl (optimum 0%). Phylogenetic trees based on the 16S rRNA gene and genomes placed both strains into distinct lineages, forming separated clades from their closest relatives. Strain SGZ-381T exhibited the highest 16S rRNA gene similarities to "Neorhizobium deserti" ACCC 61627T (97.4%), and strain sgz301269T had the highest 16S rRNA gene sequence similarity to Neotabrizicola shimadae N10T (97.6%). The respiratory quinone in both strains was ubiquinone-10. The main fatty acids of SGZ-381T were Summed feature 8, Summed feature 2 and C16:0, whereas strain sgz301269T included C10:0 3OH, C18:0 3OH and Summed feature 8. The DNA G+C content of SGZ-381T and sgz301269T was 62.1% and 65.5%, respectively. The average nucleotide identity and digital DNA-DNA hybridization values between each strain and their respective closest species were 74.6% and 20.1%, 75.3% and 17.4% respectively, below the thresholds for species delineation. Based on the comprehensive chemotaxonomic, phylogenetic, and phenotypic evidence, proposed names of the novel strains are Neorhizobium fuzhouense sp. nov. (type strain SGZ-381T=GDMCC1.4207T=JCM 36770T), Neotabrizicola paludis sp. nov. (type strain sgz301269T=MCCC 1K09178T=KCTC 8856T).

Bacterial Typing Techniques↗

PubMed1977

Bacterial stalk rot of Maize, its symptoms and host-range.

Stalk rot of maize, caused by Erwinia carotovora f. sp. zeae Sabet (re-designated as Pectobacterium chrysanthemi pathovar. zeae by KELMAN 1974) showed first premature withering and drying up of the uppermost leaves which was soon followed by the lower leaves. The rot either extended from the base upwards (basal rot) or from the top downwards (top rot). In the case of basal rot, the leaves become yellow and the infected tissue becomes brown, soft, and water soaked. Internally, the stalk turns into a soft mass of disintegrated tissue. At this stage the plants usually topple over. A foul odour, accompanied with the presence of dipterous larvae on and in decaying tissues, are the characteristic symptoms of this disease. With the advance of the disease the stalk finally dries up into a conglomeration of dry and shredded or disjointed fibrous tissue. The top rot begins with wilting and drying up ot the tips of middle leaves of the whorl. A decay that continues rapidly spreads downwards throughout the stalk and the affected plants soon droop. The host range studies were suggestive of the fact that the maize pathogen, apart from causing the disease on maize, could produce soft rot in potato, carrot, onion, sugarbeet, sweet potato, papaya, cabbage, and many other plants and could also infect Sorghum vulgare, Pennisetum typhoidium, tobacco, and tomato.

Ecology↗