Soil-borne diseases have gradually become serious. In order to prevent and cure diseases, people have invented a variety of chemical pesticides to eliminate pathogens. However, in the process, they have also eliminated beneficial bacteria in the soil, resulting in soil degradation and environmental pollution.
Humans have found that in some areas, some pathogens will naturally subside, indicating that there is a substance in these soils that can reduce pathogens, so people have extracted many kinds of soil beneficial microorganisms, including actinomycetes and fungi. And bacteria, etc., they all have a certain disease prevention function, the most common such as Trichoderma, Bacillus subtilis, etc., have a good bactericidal function.
Recently, the popular microbial agent in the market, Tu Kang Yuan, whose main component is Pseudomonas fluorescens, is a strain extracted from soil degraded by wheat-wide disease with "wheat cancer". The strain inhibits the growth of pathogenic bacteria mainly by producing bioactive substances such as antibiotic secondary metabolites/antibiotics. According to the pesticide network , its biological resistance mechanisms include: nutritional parasitism, site competition, bacteriostatic action, and bacteriolysis. Nutritional parasitic means that the bacteria first colonizes the rhizosphere of the plant, and then inhibits the growth and development of the pathogen by the competition of iron ions (Fe3+) and the antagonism of secondary metabolites/antibiotics to protect the plant body from the pathogen. . It has been confirmed that more than 10 antibiotic secondary metabolites/antibiotics having antibacterial action have been produced, such as carboxyphenazine, pyrromycin, garcinia, and 24-diacetyl lignan.
The soil of Tukangyuan was applied, not only the soil-borne diseases were reduced, but also the roots of the crops were more developed. The 24-diacetyl-glucin produced by this strain can inhibit the biosynthesis of gibberellic acid in plants and reduce å²å“š. The content of acetic acid increased the abscisic acid and isopentenyl adenosine in the plant, and the photosynthesis function of the functional leaves increased, and the root system increased, which increased the yield.
The use of microorganisms provided by nature to treat diseases not only meets people's demand for green food, but also provides protection for the sustainable development of agriculture and is worth promoting.
For more pesticide knowledge, please visit the China Pesticide Network .
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