| 摘要: |
| 从健康西瓜根组织和根际土壤中分离到68个荧光假单胞菌株。80.88％的菌株具有较强的皿内颉颃作用；4.41％的菌株活体和19.12％的菌株代谢物明显抑制西瓜枯萎菌分生孢子的萌发；52.08％的菌株可以不同程度抑制枯萎菌在瓜苗导管内定殖；23.53％的菌株可以利用几丁质作为碳源。用自然的大田土进行温室盆栽试验，A63，A51和A41菌株在各枯萎菌浓度水平下均表现出较好的防病作用。D33，A61和A63对瓜苗具有明显促进作用。 |
| 关键词: 西瓜枯萎病，颉颃菌，筛选，生物防治 |
| DOI： |
| 分类号:S436.5 |
| 基金项目: |
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| Screening of Bacterial Antagonists against Fusarium Wilt of Watermelon |
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| Abstract: |
| 68 strains of fluorescent baeteria from rhizospheres and healthy root tissues of watermelon were isolated on King's MediumB(KB)agar.Of the 68 strains,80.88% showed strongly antagonistic effecton Fusarium oxysporum f.sp.niveum on PDA plates.Conidium germination was significantly inhibited by three strains and the metabolites of 13 strains.52.08% of the strains inhibited the colonization in the vessels of water melon seedlings by Fusarium oxysporum f.sp.niveumto varying degrees.23.53% of the strains grew well on colloidal chitin agar(CA).As seed treatments,strains A63,A51 and A41 suppressed wilt incidence in field soil infected with Fusarium oxysporum f.sp. niveum at 103-105 cfu/g of soil and strains D33,A61 and A63 improved the growthof watermelon plants. |
| Key words: Fusarium oxysporum f.sp.niveum, antagonists,screening,biological control |
