非病原細菌對煙草赤星病菌的生物抑制作用研究

Study of the biological control of non2pathogenic bacteria to brown spot

摘要: 從煙草根際土壤和煙草,、黃瓜、番茄,、桑樹的莖,、葉部位分離了50 株非病原芽孢桿菌和假單孢桿菌,在培養(yǎng)條件下對煙草赤星病菌進行了生物拮抗性測定。結果表明,非病原細菌對煙草赤星病菌有較強的拮抗作用,。在不同來源的非病原細菌中,以來自煙草根際的非病原細菌對煙草赤星病菌的拮抗作用最強,。在拮抗菌對目標菌煙草赤星病菌生長發(fā)育影響中發(fā)現(xiàn),受拮抗菌作用,目標菌菌絲形態(tài)產生變異,生長發(fā)育受到影響。選取拮抗性較強的拮抗菌,在溫室條件下處理(噴灑) 煙苗,結果對煙草赤星病具有明顯的抑制作用,。

Abstract: Fifty strains of non2pathogenic bacteria were isolated from tobacco rhizospheric soil, stems and leaves of tobacco, cucumber, tomato and mulberry plants. The biological inhibitions of the strains were determinated under culture conditions.The results showed that the non2plthogenic bacteria were inhibitive to Alternaria alternata. Among the fifty strains, the in hibition of the strains isolated from tobacco rhizospheric soil was the strongest .After treated by the antagonists, the formation appeared and growth of myceliumof Alternaria alternata was influnced. The brown spot was controlled efficiently after treated by the antagonists (BS5 and BS6) 1