【摘要】 本文报道了东北地区新病害菜豆菌核病的发生、症状、病原菌的部分生物学特性和苗期抗性的鉴定方法。对病原菌生物学特性的研究结果表明:培养菌3d即可形成菌核雏形,其菌核较黄瓜菌核为小。菌丝的生长温度范围为(1—)8—30℃,以20—21℃最佳,8—25℃时产生菌核。试验了9种不同培养基对菌丝生长速率的影响。以PDA最佳,以在Czapek氏琼脂培养基上产生菌核最多。经与黄瓜、向日葵菌核病菌的交互接种表明:3种菌可交互致病但致病力不同,以向日葵菌最强;寄主以菜豆最为感病。作者在国内首次用限制期接种法在菜豆上进行了苗期抗性鉴定的研究,此种方法可快速有效地诱导菜豆发病,以芹菜段法较好。更多还原

【Abstract】 The occurrence, symptom part of biological characteristics of the pathogenic fungi of fungal nucleus disease of kidney bean——a new disease ofnortheast of China, are reported. The method for determining the resistivity to the disease during seedling stage is also reported. The result from the study on the biological characteristics of the pathogenic fungi showed the following facts. The embryonic form of fungal nucleus could form from cultivated fungi in three days, which were smaller than those on cucumber. The temperature for the growth of hypha ranged from 8℃ to 30℃, the best of which was 20-21℃. The fungal nucleus formed under the condition of 8-25℃. Nine kinds of culture media which had different effects on the growth rate of hypha were tested, among which PDA was the best and Czapek agar medium produced the most fungal nuclei. The each other’s inoculation with the fungi from cucumber and sunflower showed that the three kinds of fungi could cause disease each other to different extent. The fungi from sunflower were the strongest agent and cucumber was the most susceptible host to the disease. The author for the first time in China carried out the study on determination of resistivity of seedling on kidney bean by using the inoculating method of limited stage. The method can induce the disease of kidney bean quickly and effectively. (CH)更多还原