摘要
在人工气候箱内分析测定了接种体密度、土壤含水量和土壤温度对大豆疫霉根腐病发生的影响。结果表明，每克干土中分别接种0、10、50、100、200、300、400、500、600、700个游动孢子，发病率逐渐升高，每克干土中接种400个游动孢子时发病率达到最高，浓度再升高发病率开始下降。在饱和土壤含水量（40％）条件下，土壤温度在10℃-25℃范围内，发病率随温度升高不断增加，25℃时发病率达到最高，温度再升高发病率降低。在最适温度（25℃）条件下，土壤含水量在15％～40％之间变化时，发病率逐渐升高，当土壤含水量40％时发病率达到最高，土壤含水量再升高发病率下降。
Under controlled condition in growth chamber, we studied the development of Phytophthora root rot disease of soybean in relation to soil temperature, soil water content and inoculum density. The results showed the disease rate increased gradually with increasing inoculum density and peaked at 400 per gram dry soil, and declined after the peak. When soil water content approached the saturation, the disease rate increased with increasing soil temperature, and the optimum infection temperature of P. sojae was 25℃. Under the optimum infection temperature, the rate of Phytophthora root rot disease increased again when the soil water content changed from 15% to 40%, and then declined, we found that the rate of Pytophthora root rot disease of soybean was influenced by soil temperature, soil water content and their interactions. Only when soil temperature and soil water content were in suitable conditions,Phytophthora root rot disease of soybean might occur.
出处
《中国油料作物学报》
CAS
CSCD
北大核心
2008年第3期342-345,共4页
Chinese Journal of Oil Crop Sciences
基金
黑龙江省教育厅资助项目(10541019)
关键词
大豆疫霉菌
土壤含水量
接种体密度
Phytophthora sojae
Soil water content
Inoculum density
