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Bảo vệ thực vật

Lê Thị Hiền, Đinh Văn Lới, Vũ Thị Vân, Nguyễn Văn Giang(1)

Phân lập và tuyển chọn các chủng xạ khuẩn (Streptomyces spp.) đối kháng nấm bệnh cây

Isolation and screening Streptomyces spp. against plant pathogenic fungi

Khoa học và Phát triển

2014

5

656-664

1859-0004

The aim of the present study was to identify Streptomyces spp. antagonistic to plant pathogenic fungi. From eight of different soil samples, a total of 43 isolates of Streptomyces were isolated and they were divided into 7 groups with different proportion: white 37.2 percent; grey 22.9 percent; brown 14.0 percent; yellow 11.6 percent; pink 2.3 percent; purple 2.3 percent; and blue 4.7 percent. Of 43 isolates, 16 were antagonistic to Fusarium oxysporum, 11 were antagonistic to Botryosphaeria dothidea, 3 were antagonistic to Phytophthora capsici, and 4 were antagonistic to Sclerotium hydrophylum. Two streptomyces isolates, HN6 and NA1 were selected due to their high fungal antagonism. HN6 and NA1 grew well on Gause I medium at 30°C, neutral pH and fairly high salt concentration. On ISP 9 culture medium HN6 and NA1 were able to utilize various sugar sources: D - glucose; saccarose, D - xylose, rhamnose and raffinose. The isolate HN6 was preliminarily identified as Streptomyces roseosporus, while NA1 as Streptomyces albofaciens.

TTKHCNQG, CVv 261