为了明确玉米褐斑病菌休眠孢子囊的萌发条件,本试验测定了不同温度、pH值、光照处理对玉米褐斑病菌休眠孢子囊萌发的影响.试验结果表明,20～35℃培养条件下玉米褐斑病菌休眠孢子囊均能萌发,适宜温度范围为26～32℃,休眠孢子囊萌发率分别为49.6%、47.5%和49.5%,适宜pH值为6～9,休眠孢子囊萌发率分别为49.3%、49.7%、45.3%和47.3%;休眠孢子囊萌发需要光照,在全光照和光暗交替培养条件下,休眠孢子囊萌发率分别为45.4%和49.6%,高于全黑暗条件下的萌发率30.1%,但是在1 300～14 000 lx光照强度范围内,休眠孢子萌发率不受光照强度的影响;本研究结果为明确玉米褐斑病的发生条件提供了依据.%Factors affecting germination of the resting sporangia of Physodermna naydis-the pathogen of maize brown spot were studied. Results showed that temperatures from 20 ℃ to 35 ℃ were suitable for the germination of the resting sporangia, but the optimum temperatures were 26 ℃, 29 ℃ and 32 ℃ with the germination rates 49. 66％, 47. 5％ and 49.5％, respectively. The favorable pH value for the resting sporangia germination was 6, 7, 8 and 9 with the germination rates 49.3％, 49.7％, 45.3％ and 47.3％, respectively. Maximum germination rate was obtained when sufficient light was provided. The germination rate was 45.4％ and 49.6％ under 24 h light and 24 h light-dark cycle (12:12 h light-darkness), which was significantly higher than that under 24 h darkness condition. However, the light intensity during 1 300～14 000 Ix had no effect on the germination of the resting sporangia. The findings can provide evidence for idendification of maize brown spot diseases.
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