Isolation and evaluation of Bacillus subtilis RSS-1 as a potential biocontrol agent against Sclerotinia sclerotiorum on oilseed rape

Autor: Shun Cao, Bingxin Jiang, Guogen Yang, Guangxue Pan, Yuemin Pan, Fangxin Chen, Zhimou Gao, Yuli Dai
Rok vydání: 2023
Předmět:
Zdroj: European Journal of Plant Pathology. 166:9-25
ISSN: 1573-8469
0929-1873
Popis: Sclerotinia stem rot caused by Sclerotinia sclerotiorum is one of the most important diseases of oilseed rape in the world. Because of the absence of resistant varieties and the disadvantages of chemical control, application of antifungal microbes has become an eco-friendly and effective measure to control this disease. In this study, Bacillus subtilis strain RSS-1, isolated from soil samples, was identified based on morphological, physiological and biochemical tests, and DNA gyrase subunit A (gyrA), gyrB, DNA-directed RNA polymerase subunit beta (rpoB) and rpoC gene sequence analysis. It significantly inhibited mycelial growth and sclerotial production of S. sclerotiorum in vitro. In greenhouse experiments, all three tested concentrations (106, 107, 108 cfu mL−1) of cell fermentation broth and culture filtrate significantly reduced the severity of sclerotinia stem rot on oilseed rape (P S. sclerotiorum than at 24 h post inoculation, suggesting that RSS-1 should be applied as a prophylactic rather than a curative biological agent. Colonization tests indicated that the population density of RSS-1 on rapeseed leaves significantly decreased (P S. sclerotiorum infection. These results suggest that RSS-1 was a potential biological agent for controlling sclerotinia stem rot caused by S. sclerotiorum on oilseed rape.
Databáze: OpenAIRE
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