论文部分内容阅读
研究了各种因素对黑颖病发病的影响,结果表明,最适宜黑颖病的发生和表现典型病状的温度为22℃,发病的适宜光照强度为160000勒克斯·小时,结露和充足的湿度是发病轻、重的主要因素,接种体浓度每毫升含0.75～24.0×10~8个菌体均可。比较了几种接种方法,证明剪叶法简便易行,准确可靠,可做定叶接种、受气象因素影响较小,具有实际应用价值。鉴定了2883个小麦品种的抗病性,表明各品种抗性有明显差异。比较研究了140个不同抗性等级品种的苗期和成株期抗病性的相关性,两者的正相关率为45％,有50％以上的品种苗期抗性较强于成株期抗性,一般成株期抗性比苗期下降1级。苗期抗性鉴定可以用于初筛,对苗期表现高抗和中抗品种,再进一步做成株期抗病性鉴定。
The effects of various factors on the pathogenesis of black and yingling were studied. The results showed that the most suitable temperature and temperature for the occurrence and performance of the pathogens were 22 ℃ and 160000 lux, and the optimal dew and humidity Is the incidence of light and heavy main factor inoculum concentration per ml 0.75 ~ 24.0 × 10 ~ 8 bacteria can be. Several methods of inoculation were compared to prove that the method of leaf pruning was simple and convenient, accurate and reliable, and could be fixed leaf inoculation, which was less affected by meteorological factors and had practical value. The disease resistance of 2,883 wheat cultivars was identified, indicating that there was a significant difference in resistance among the varieties. The correlation between disease resistance at seedling stage and adult stage of 140 cultivars with different resistance grades was comparatively studied. The positive correlation rate was 45%, and more than 50% of the cultivars had stronger resistance at seedling stage Resistance, general adult plant resistance decreased by 1 grade. Seedling resistance identification can be used for primary screening, the seedling stage of high resistance and moderate resistance varieties, and then further made of disease resistance identification.