Bacterium for degrading herbicides chlorimuron-ethyl and acetochlor and application of bacterium

Abstract

The invention discloses a bacterium for degrading herbicides chlorimuron-ethyl and acetochlor and application of the bacterium. The bacterium is cellulosimicrobium sp. LY114, which is preserved in China General Microbiological Culture Collection Center by a preservation number of CGMCC No.7776. The cellulosimicrobium sp. LY114 CGMCC No.7776 reaches a degrading rate of 89.11% on chlorimuron-ethyl (45mg / L) and acetochlor (45mg / L) in an organic salt culture medium within 7d, showing that the strain can effectively degrade the chlorimuron-ethyl and the acetochlor; and the bacterium has a wide application prospect in an aspect of repairing chlorimuron-ethyl and acetochlor pollution of soil.

Description

technical field [0001] The invention relates to a bacterium for degrading the herbicides chlorimuron-methyl and acetochlor and its application. Background technique [0002] Chlorimuron-methyl, English common name chlorimuron-ethyl, chemical name 2-(4-chloro-6-methoxypyrimidin-2-ylcarbamoylsulfamoyl) methyl benzoate, structural formula as shown in formula 1: [0003] [0004] Chlorimuron-methyl is an ultra-efficient sulfonylurea herbicide, and its target is ALS (acetolactate synthase) in plants, which inhibits the biosynthesis of branched-chain amino acids valine and isoleucine, resulting in the substrate α- The accumulation of butanone hinders the DNA synthesis in interphase of cell division, stops mitosis, and the cells cannot grow normally. Chlorimuron-methyl can be absorbed by the roots, stems, and leaves of plants, and conducts up and down in the plant body. It is a selective pre-emergence and post-emergence herbicide. It is mainly used in farmland such as soybeans ...

AI Technical Summary

Problems solved by technology

[0008] The extensive use of chemical herbicides has greatly improved the efficiency of agricultural production, but at the same time it has also brought about great production and environmental problems. For example, the phytotoxicity of long-residual herbicides to subsequent crops is becoming more and more serious, which affects the adjustment of agricultural planting industry structure and brings great impact on agricultural production. serious losses in production

Chlorimuron-methyl has the advantages of less dosage, high activity, and good weeding effect, and is deeply loved by farmers. However, chlorimuron-methyl is a long-acting herbicide with a long residual period in the soil, which can reach 2-3 years. It will cause different degrees of phytotoxicity to subsequent crops such as sugar beets, potatoes, melons, sorghum, rapeseed, corn, etc., resulting in slow growth of plants, necrosis of growing points, aging of branches and stem bases, shortening of internodes, dwarfing of plants, Delayed maturity and even death of crops

Re-planting sunflowers in the soybean fields where chlorimuron-methyl has been used will cause large-scale damage to the sunflowers after cropping.

[0009] The degradation of herbicide residues in nature is mainly accomplished by microorganisms in the soil, but the natural degradation is very slow

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