简介：Abstract： The water extract of dry mycelium of Penicillium chrysogenum （DME） was used to induce resistance in Virginia tobaccoplants against Phtophthora parasitica var。 nicotianae。 Results showed that the efficacy of DME in controlling black shank diseasedepended on both DME solution concentration and its’ treatment methodology。 Soil application of 1。5-5% DME 72 hr beforeinoculation with Phtophthora parasitica var。 nicotianae provided highly significant protection against black shank， relative to thecontrol without DME treatment。 Optimized tobacco plant treatment with 2。5% DME significantly increased peroxidase （POD） andpolyphenol oxidase （PPO） activity levels in the upper leaf sections of the tobacco plants。 DME had no direct antifungal activity onthe growth of Phtophthora parasitica var。 nicotianae in vitro， suggesting that disease control with DME treatment resulted from theinduced propagation of natural defense mechanisms in the tobacco plants。
简介：Abstract： The water extract of dry mycelium of Penicillium chrysogenum （DME） was used to induce resistance in Virginia tobaccoplants against Phtophthora parasitica var。 nicotianae。 Results showed that the efficacy of DME in controlling black shank diseasedepended on both DME solution concentration and its’ treatment methodology。 Soil application of 1。5-5% DME 72 hr beforeinoculation with Phtophthora parasitica var。 nicotianae provided highly significant protection against black shank， relative to thecontrol without DME treatment。 Optimized tobacco plant treatment with 2。5% DME significantly increased peroxidase （POD） andpolyphenol oxidase （PPO） activity levels in the upper leaf sections of the tobacco plants。 DME had no direct antifungal activity onthe growth of Phtophthora parasitica var。 nicotianae in vitro， suggesting that disease control with DME treatment resulted from theinduced propagation of natural defense mechanisms in the tobacco plants。