番茄根际促生菌-假单胞菌的生防作用

研究了番茄根际促生菌--假单胞菌在黄瓜根部的定殖能力以及对黄瓜灰霉病和枯萎病的生防作用.结果表明,假单胞菌在浸种和灌根两种情况下均能够定殖在黄瓜根部.拮抗测定表明,一些株系对黄瓜灰霉病菌和黄瓜枯萎病菌有较好的抑制作用,最高抑制率分别达到89.1%和65.6%.离体及盆栽试验表明,CBT1、CBT3、CBT6对黄瓜灰霉病有较好的防治效果,相对防效分别为51.1%～62.4%和44.0%～67.7%;CBT1、CBT6、CBT7对黄瓜枯萎病有一定的防治效果,相对防效分别为55.3%～59.3%和47.7%～55.4%.

The Biocontrol Effects of Pseudomonas in the Rhizosphere of Tomatoes

The colonization and biocontrol effects of plant growth promoting rhizobacteria-Pseudomonads in the rhizo-sphere of tomatoes were investigated. Pseudomonas CBT1 can colonize the rhizosphere of cucumbers by the methods of seed soaking and root watering. The antimicrobial activity results showed that some isolates suppressed the mycelial growth of B. cinerea and F. oxysporum f. sp. cucumerinum, the highest inhibitory rate was 89.1% and 65.6% ,respectively. The efficient isolates were tested and found relative control effects on grey mold and fusarium wilt diseases of cucumber were 44.0% -67.7% and 47.7% -55.4% in pot experiments,respectively.