Enterobacter cloacae strain and application thereof

Abstract

The invention belongs to the technical field of microorganisms, and particularly relates to an enterobacter cloacae strain and application thereof. The enterobacter cloacae strain is preserved in the China General Microbiological Culture Collection Center on December 23 <rd>, 2020, and the preservation number is CGMCC NO. 21529. The enterobacter cloacae strain can promote plant root systems to synthesize auxin and promote plant lateral root development. Plant root system development promotion is specifically reflected in promoting generation and extension of plant lateral roots; plant growth and development promotion is specifically reflected in promoting increase of the fresh weight and yield of plants. The enterobacter cloacae strain can also be used for preparing auxin in a fermentation mode.

Description

technical field [0001] The invention belongs to the technical field of microorganisms, and in particular relates to an Enterobacter cloacae strain and its application. Background technique [0002] With the growth of the world population, people have higher and higher requirements on the yield and quality of food and commercial crops. "Food is the most important thing for the people", the food problem has always existed and is an important problem to be solved. my country has a land area of ​​9.6 million square kilometers, ranking third in the world, with vast territory and abundant resources. However, due to the many mountains, deserts, and grasslands in the territory, the available arable land area is about 1.4 million square kilometers, accounting for about 16% of the country's land area. Due to factors such as desertification, conversion of farmland to forests, and urbanization of cultivated land in some areas of our country, the area of ​​cultivated land is actually d...

AI Technical Summary

Problems solved by technology

However, long-term large-scale application of chemical fertilizers is likely to cause soil pollution. For example, large-scale application of physiological acid fertilizers such as potassium chloride is likely to affect the physical and chemical properties of the soil, change the pH value of the soil, and cause the soil to become acidic, H + and Al 3+ content increased, thus affecting the normal growth of plants; excessive application of chemical fertilizers can also easily lead to Cl - , NO3 - And the accumulation of heavy metal ions in the soil will affect the quality of crops, which is not in line with people's pursuit of green organic food; in addition, the unreasonable application of chemical fertilizers will reduce the organic matter content of the farmland plow layer, destroy the aggregate structure, and reduce the water storage and fertilizer retention capacity. In addition to the effective use of fertilizers, it is easy to cause soil compaction and hardening, and the oxygen content is reduced, which in turn affects the development of plant roots.

Long-term application of chemical fertilizers not only pollutes and destroys the soil ecosystem, affects crop quality, but also seriously affects the water ecosystem

Research and surveys show that the chemical fertilizers used by plants only account for 30%-40% of the applied amount, and the remaining part is fixed in the soil on the one hand, and a large part enters the water body through seepage and leaching, resulting in the enrichment of the water body. Nutritization, causing algae and other plankton to multiply, reducing dissolved oxygen in water, deteriorating water quality, and causing mass death of fish and other organisms

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