Streptomyces having inhibiting effect on Corynespora cassiicola and application of Streptomyces

Abstract

The invention discloses Streptomyces having an inhibiting effect on Corynespora cassiicola and application of the Streptomyces. The Streptomyces is Streptomyces phaeoluteichromatogenes HEBRC-45958, and the preservation number of the Streptomyces phaeoluteichromatogenes is CCTCC No. M2015768. The Streptomyces has the advantages that the Streptomyces phaeoluteichromatogenes can generate fermentation broth with high antibacterial activity after fermentation, and the fermentation broth is good in preventing and treating effect on Corynespora leaf spot caused by the Corynespora cassiicola; compared with current chemically-synthesized bactericide, the Streptomyces phaeoluteichromatogenes comes from the natural environment and is efficient, low in toxicity, free of environment pollution, less prone to tolerance generating, and the like.

Description

technical field [0001] The invention belongs to the technical field of crop prevention and control, and in particular relates to a Streptomyces strain with an inhibitory effect on Corynebacterium multiprime and its application. Background technique [0002] Corynespora cassiicola, belonging to the subphylum Deuteromycota, Hychospora, Hychospora, Duromycetaceae, Corynespora, is a worldwide distribution of plant pathogenic fungi with a wide range of hosts. The earliest species found in this genus with the widest range of hosts. It can infect 530 species of plants in nearly 380 genera in tropical and subtropical regions, including cucumber, tomato, cotton, cowpea, soybean, papaya, tobacco and rubber (Smith, 2008). The fungus mainly damages the leaves of plants, forming typical necrotic spots with yellow halos, and can also infect roots, stems, flowers and fruits, causing defoliation and fruit drop in severe cases. [0003] Corynebacterium polyphylla was first reported in Indi...

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Problems solved by technology

[0003] In 1958, it was first reported in India that Corynebacterium multiprimum caused Corynemycetes defoliation (Ramakrishnan and Pilla, 1961), and the disease occurred successively in the main rubber-producing areas of Asia-Pacific and Africa in the 1950s and 1980s. However, because the occurrence of the disease is limited to nurseries and young plants and the damage is not serious, it has not attracted people's attention as a secondary disease.

However, in recent years, disease investigations have found that plant diseases caused by Corynemycetes multiprime have seriously affected the production of many types of economic crops in the world, and caused huge economic losses. , a bunch of red, poinsettia, water boxwood, cucumber, tomato, pepper and other horticultural crops Corynesporium leaf spot; The loss reaches 11,800 kg / ha (Pernez ny et al., 1996), and it is estimated that once severe Corynesporium leaf defoliation occurs, the yield loss of rubber trees will be nearly 20%; in addition, in Brazil, the Philippines, Nigeria, India and South Korea Corynesporium leaf spot has also been reported in Asian countries such as Japan and Japan (Chee, 1990)

[0004] In my country, Wei Jingchao first discovered cowpea leaf spot in the lower reaches of the Yellow River in 1950, but due to the limited planting area of ​​cowpea, it has not attracted much attention.

In the early 1990s, cucumber and eggplant vegetable cultivation fields in Henan, Liaoning and other places in my country were generally infested by Corynebacterium polybasicus, causing certain economic losses.

But the actinomycetes isolated at present are only 0.1-1% of the actual species, so it has great application and development space, and there is no anti-corynebacterium leaf spot of live actinomycetes and the antibiotics produced at present. to report

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