Verticillium wilt is an important disease in cotton production, occurring in all cotton-producing countries in the world all year round, causing serious yield reductions and economic losses. Since cotton verticillium wilt is a soil-borne vascular disease, most chemical pesticides cannot be transported to the vascular site, so there is still a lack of effective chemical control measures in the world. The use of antagonistic microorganisms for disease control is in line with the strategic needs of the development of green agriculture, has the greatest development prospects, and is also a research hotspot in the field of crop disease control.
Recently, Tang Canming, professor of the College of Agronomy of Nanjing Agricultural University, and Zhu Heqin, researcher of the Cotton Research Institute of the Chinese Academy of Agricultural Sciences, cooperated to carry out research on the biological control mechanism of cotton verticillium wilt, and found that the pectin lyase in Bacillus amyloidii has dual activities of bacteriostatic and induced immunity, which is of great significance for the prevention and control of cotton verticillium wilt. The findings were published in the Journal of Hazardous Materials.
The study found that a protein active substance, pectin lyase, was present in the biocontrol strain Bacillus amyloid 41B-1, which had a 61.9% effect on verticillium wilt. Further studies found that pectin lyase has the dual role of inducing immunity and inhibiting the growth of Verticillium wilt bacteria. It is mainly to induce the accumulation of reactive oxygen species in the cotton plant, corpus callosum deposition, enhance the resistance of cotton to verticillium wilt, at the same time, by inducing the pathogenic bacteria to participate in the degradation of the endoplasmic reticulum, apoptosis and other related genes upregulated expression, resulting in a variety of adverse physiological and biochemical reactions in pathogenic bacteria cells, such as exacerbating the collapse of mitochondrial membrane potential, increasing the content of calcium ions in the cytoplasm, stress response in the endoplasmic reticulum, etc., and eventually inducing apoptosis of pathogenic protobacterial cells.
The study laid a theoretical and technical foundation for the development of bioprotein pesticides, and provided a new path for the prevention and control of verticillium wilt in cotton in the field.
Related thesis information: https://doi.org/10.1016/j.jhazmat.2020.124029
【Source: Popular Science China Network】
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