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2. Bacillus velezensis YXDHD1-7 Prevents Early Blight Disease by Promoting Growth and Enhancing Defense Enzyme Activities in Tomato Plants.

Author

Li, Wangxi, Sun, Lili, Wu, Hangtao, Gu, Wenjie, Lu, Yusheng, Liu, Chong, Zhang, Jiexin, Li, Wanling, Zhou, Changmin, Geng, Haoyang, Li, Yaying, Peng, Huanlong, Shi, Chaohong, Wang, Dan, and Peng, Guixiang

Subjects
BACILLUS (Bacteria), BLIGHT diseases (Botany), PLANT growth-promoting rhizobacteria, TOMATOES, BIOLOGICAL pest control agents, PLANT defenses, GENE clusters
Abstract

Bacillus velezensis is well known as a plant growth-promoting rhizobacteria (PGPR) and biocontrol agent. Nevertheless, there are very few reports on the study of B. velezensis on tomato early blight, especially the biocontrol effects among different inoculation concentrations. In this study, an IAA-producing strain, Bacillus velezensis YXDHD1-7 was isolated from the tomato rhizosphere soil, which had the strongest inhibitory effect against Alternaria solani. Inoculation with bacterial suspensions of this strain promoted the growth of tomato seedlings effectively. Furthermore, inoculations at 106, 107, and 108 cfu/mL resulted in control efficacies of 100%, 83.15%, and 69.90%, respectively. Genome sequencing showed that it possesses 22 gene clusters associated with the synthesis of antimicrobial metabolites and genes that are involved in the production of IAA. Furthermore, it may be able to produce spermidine and volatile compounds that also enhance plant growth and defense responses. Our results suggest that strain YXDHD1-7 prevents early blight disease by promoting growth and enhancing the defense enzyme activities in tomato plants. This strain is a promising candidate for an excellent microbial inoculant that can be used to enhance tomato production. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Effects of sulphur and Thiobacillus thioparus 1904 on nitrogen cycle genes during chicken manure aerobic composting

Author

Peizhi Xu, Dan Wang, Wu Hangtao, Sun Lili, Wenjie Gu, Chaohong Shi, Lu Yusheng, Li Xia, and Kaizhi Xie

Subjects
inorganic chemicals, 0301 basic medicine, Denitrification, Nitrogen, 030106 microbiology, Nitrous-oxide reductase, 010501 environmental sciences, 01 natural sciences, 03 medical and health sciences, chemistry.chemical_compound, Animals, Food science, Nitrite, Waste Management and Disposal, Nitrogen cycle, 0105 earth and related environmental sciences, Composting, Ammonia monooxygenase, Nitrogen Cycle, Thiobacillus, Manure, Nitrite oxidoreductase, chemistry, Chicken manure, Nitrification, Chickens, Sulfur
Abstract

Severe nitrogen (N) loss is a barrier for composting treatment. Since N transformation during composting is closely related to nitrogen loss, the impacts of adding sulphur and Thiobacillus thioparus 1904 to N transformation during composting were investigated in this work. Physicochemical properties and the expression of genes encoding N-related proteins were analysed to evaluate microbiological processes associated with N dynamics. The results indicated that (1) sulphur addition reduced the pH and cumulative NH3 emission, and decreased N losses by 44.23%, while no significant differences were observed in the expression of N cycle-associated genes compared with the control treatment; (2) the application of T. thioparus 1904 increased NO3−-N content, reduced N loss by 28.20%, and significantly enhanced the expression of ammonia monooxygenase A (archaeal amoA; AOA) and nitrite oxidoreductase A (nxrA) during the mature phase; (3) the combined application of sulphur and T. thioparus 1904 significantly affected the expression of functional genes related to nitrification and denitrification, which contributed to a reduction in accumulated NH3 emission, an increase in NO4+-N content, and a decrease in N losses by 70.94%. Expression of ammonia monooxygenase A (bacterial amoA; AOB), nxrA and nitrous oxide reductase Z (nosZ) genes in the combined treatment was positively correlated with NO3−-N, whereas expression of AOA and accumulation of NH3 were negatively correlated with NO3−-N. These results indicate that the combined application of sulphur and T. thioparus 1904 had a significant regulatory effect on N cycle genes and effectively reduced the N loss during composting.

Published
2018

9. Effect of Thiobacillus thioparus 1904 and sulphur addition on odour emission during aerobic composting

Author

Li Xia, Sun Lili, Wu Hangtao, Peizhi Xu, Lu Yusheng, Kaizhi Xie, Wenjie Gu, and Wen Sun

Subjects
Environmental Engineering, 010504 meteorology & atmospheric sciences, Sulphur addition, Thiobacillus thioparus, ved/biology.organism_classification_rank.species, Inorganic chemistry, chemistry.chemical_element, Bioengineering, Methanethiol, 010501 environmental sciences, engineering.material, 01 natural sciences, Thiobacillus, Ammonia, chemistry.chemical_compound, Waste Management and Disposal, 0105 earth and related environmental sciences, Sulfur Compounds, Renewable Energy, Sustainability and the Environment, ved/biology, Compost, Composting, General Medicine, Nitrogen, Sulfur, chemistry, Environmental chemistry, Odorants, engineering
Abstract

The effects of sulphur and Thiobacillus thioparus 1904 on odour emissions during composting were studied. Results indicated that the sulphur addition reduced the pH and decreased cumulative emission of ammonia and the nitrogen loss by 47.80% and 44.23%, respectively, but the amount of volatile sulphur compounds (VSCs) and the sulphur loss increased. The addition of T. thioparus 1904 effectively reduced the cumulative emissions of H2S, methyl sulphide, methanethiol, dimethyl disulphide and the sulphur loss by 33.24%, 81.24%, 32.70%, 54.22% and 54.24%, respectively. T. thioparus 1904 also limited the nitrogen loss. The combined application of sulphur and T. thioparus 1904 resulted in the greatest amount of nitrogen retention. The accumulation of ammonia emissions was reduced by 63.33%, and the nitrogen loss was reduced by 71.93%. The combined treatment did not increase the emission of VSCs. The application of sulphur and T. thioparus 1904 may help to control the odour of compost.

Published
2017

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