CAJ | 학술논문

[目的]对天水地区苜蓿霜霉病病原及生物学特性进行较为系统的研究.[方法]在苜蓿生长季节,观察和描述症状.采用悬滴法,研究温度、pH值和营养液对孢子囊萌发的影响,采用硫酸法控制小容器相对湿度测定湿度对孢子囊萌发的影响.[结果]经鉴定,苜蓿霜霉病病原为Peronospora aestivalis Syd,孢子囊萌发的适宜温度为15～21 ℃,最适温度为18 ℃;孢子囊在相对湿度100%时的萌发率为5.56%,相对湿度低于95%时不能萌发;孢子囊萌发的适宜pH值为6.15～7.69,最适pH值为6.91;1∶5的苜蓿叶片汁液对孢子囊的萌发有较强的刺激作用.[结论]该研究为苜蓿霜霉病的防治提供理论依据.
[목적]대천수지구목숙상매병병원급생물학특성진행교위계통적연구.[방법]재목숙생장계절,관찰화묘술증상.채용현적법,연구온도、pH치화영양액대포자낭맹발적영향,채용류산법공제소용기상대습도측정습도대포자낭맹발적영향.[결과]경감정,목숙상매병병원위Peronospora aestivalis Syd,포자낭맹발적괄의온도위15～21 ℃,최괄온도위18 ℃;포자낭재상대습도100%시적맹발솔위5.56%,상대습도저우95%시불능맹발;포자낭맹발적괄의pH치위6.15～7.69,최괄pH치위6.91;1∶5적목숙협편즙액대포자낭적맹발유교강적자격작용.[결론]해연구위목숙상매병적방치제공이론의거.
[Objective]The research aimed to study the pathogen of alfalfa downy mildew and its biological characteristics.[Method]The disease was observed in the field. Germination rate of sporangium in different temperature, pH and nutrition was examined with suspending drop method. Slide germination method was used to observe its germination in different humidity maintained by different concentration of H_2SO_4.[Result]The pathogen was Peronospora aestivalis Syd. The optimum temperature range for sporangium sprot was from 15 ℃ to 21 ℃,and the best optimum temperature was 18 ℃. The spore germination percentage reached 5.56% at the humidity of 100%. The spore couldn' t germinate when the humidity was below 95%.The optimum pH range was from 6.15 to 7.69, and the best optimum pH was 6.91.The leaf extract of 1∶5 was good for its germination. [Conclusion] The research provided the basis for the prevention and cure of downy mildew of alfalfa.