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Acta Prataculturae Sinica ›› 2026, Vol. 35 ›› Issue (5): 151-161.DOI: 10.11686/cyxb2025238

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Promotion effect of Lysobacter enzymogenes LE16 on the growth of tobacco

Yan-xue DUAN1,3(), Liu YANG2, Yong WANG2, Xue HAN1, Dong-yang LIU2, Chao MA1, Quan DENG2, Yu-lan CHEN2, Jian-guo HUANG1, Yong LI1()   

  1. 1.College of Resources and Environment,Southwest University,Chongqing 400715,China
    2.Liangshan Tobacco Company of Sichuan Province,Xichang 615000,China
    3.Agriculture and Rural Affairs Bureau of Dachuan District,Dazhou City,Sichuan Province,Dazhou 635000,China
  • Received:2025-06-16 Revised:2025-09-01 Online:2026-05-20 Published:2026-03-11
  • Contact: Yong LI

Abstract:

Nicotiana tabacum is a cash crop with high fertilizer demands. In Chinese tobacco-growing regions, long-term excessive application of chemical fertilizers, particularly nitrogen and phosphorus, has led to accumulate nutrient-rich in soils, which are poorly available for plant uptake with insoluble organic forms. Utilizing microorganisms to solubilize these bound nutrients presents a viable strategy to reduce fertilizer application, lower costs, and improve nutrient-use efficiency in tobacco cultivation. This study investigated the effects of Lysobacter enzymogenes LE16 on soil nutrient mobilization and tobacco growth through soil incubation experiments, pure culture assays, and pot trials. The results demonstrated that strain LE16 secretes protease and phosphatase enzymes. In soil incubation experiments, inoculation with LE16 significantly enhanced the activities of neutral protease and neutral phosphatase, concurrently increasing the contents of alkali-hydrolyzable nitrogen and available phosphorus in the soil (P<0.05). Significant positive correlations were observed between alkali-hydrolyzable nitrogen content and neutral protease activity (r=0.925**, P<0.01), and available phosphorus content and neutral phosphatase activity (r=0.405*, P<0.05). Pot experiments revealed that activities of the neutral protease and neutral phosphatase, as well as the content of alkali-hydrolyzable nitrogen in the rhizosphere soil were significantly higher (P<0.05) in the treatments receiving chemical fertilizer+LE16 (CF+LE16) and 90% chemical fertilizer+LE16 (0.9CF+LE16) compared to treatment with chemical fertilizer (CF). Specifically, neutral protease activity increased by 21.96% and 46.08%, neutral phosphatase activity by 35.59% and 52.13%, and alkali-hydrolyzable nitrogen by 18.58% and 12.83%, in the CF+LE16 and 0.9CF+LE16 treatments, respectively. The available phosphorus content in the CF+LE16 and 0.9CF+LE16 treatments was higher than that in the CF treatment, though not significantly. Furthermore, the uptake of nitrogen, phosphorus and potassium in tobacco plants was significantly promoted (P<0.05) in the CF+LE16 and 0.9CF+LE16 treatments, with increases of 16.55% and 9.24% for nitrogen, 5.70% and 4.83% for phosphorus, and 18.46% and 11.59% for potassium, respectively. Additionally, growth parameters-including stem fresh/dry weight, leaf fresh/dry weight, plant height, and maximum leaf area-in the 0.9CF+LE16 treatment were comparable to those in the CF treatment. The study demonstrates that L. enzymogenes LE16 effectively mobilizes bound soil nutrients, enhances nutrient uptake, and promotes tobacco plant growth, showing considerable potential for reducing fertilizer application while maintaining yield.

Key words: Lysobacter enzymogenes LE16, nutrient activation, Nicotiana tabacum, growth