Bacterial strain XY21 preventing and curing glasshouse vegetable bacterial wilt

Abstract

The invention provides a biologic bacterial strain XY21 for preventing and treating bacterial wilt in greenhouse vegetables, and pertains to the technical field for preventing and treating diseases in crops. The XY21 is verified to be Serratia sp., the culture preservation no. is CGMCC NO.2059. The XY21 bacterial strain expresses good colonization surrounding the roots of tomatoes. After soaking the culture for 14 days, the colonized volume of the bacterial strain surrounding a root of tomato tree is 5.05 is multiplied by 10<7>cfu/g soil. If the wet bacterial strain is mixed with a lab thallus-preservation solution in a proportion of 1:40 (g/ml), the bacterial strain can be stored 2-3 years under room temperature. Tests show that, by application XY21 bacterial strain in fields, the prevention effect is 64.84% and 79.80% respectively, the outputs of the diseased fields increased respectively 31.8% and 45.8%. The invention is of high prospective to be developed into commercial live-vaccine biologic preventing preparations.

Description

1. Technical field [0001] The invention relates to a single bacterial strain for preventing and curing greenhouse vegetable bacterial wilt, belongs to the technical field of crop disease prevention and treatment, and is specially used for the pollution-free prevention and treatment of vegetable bacterial wilt. 2. Technical background [0002] Bacterial wilt is an important plant soil-borne disease, which commonly occurs in tropical, subtropical and temperate regions and causes serious damage. Potatoes, tomatoes, and tobacco, the main crops in my country, are all damaged by this fungus, causing losses to varying degrees. At present, the planting area of ​​vegetables in protected areas in my country is constantly expanding. Because the temperature and humidity conditions in protected areas are suitable for the growth of R. solanacearum, and Ralstonia solanacearum has a wide range of hosts, it can infect most of the Solanaceae vegetables. Therefore, it is easy to cause continuo...

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Problems solved by technology

However, because the composition groups of R. solanacearum strains are very complex, and other microorganisms used for biological control of R. solanacearum are generally screened from various soils, and typical or single strains of R. solanacearum are used as indicator bacteria, the purpose of screening is not strong. Antagonistic microorganisms also have certain limitations, resulting in no biocontrol agents that can successfully control different R. solanacearum bacteria in practical applications.

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