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广州郊区、新会县荷塘乡及南海县佛山市郊的蕪菁、芥菜、白菜、菜心和蘿卜等十字花科蔬菜普遍感染花叶病.根据寄主范围、病状及病毒的物理性質,这种花叶病經鑒定系由甘藍病毒2号(Brassica virus 2)的2个品系及黃瓜病毒1号((Cucumis virus1)的2个品系所致。在屬于甘藍病毒2号的两个品系中,一个类似芜菁花叶病毒(Chamber-lain,1936)(簡称“芜菁毒系”),另一个类似油菜花叶病毒(凌立与楊演1940,1941)(簡称“油菜毒系”)。在屬于黄瓜病毒1号的两个品系中,一个对十字花科蔬菜完全缺乏侵染力,而另一个有微弱的侵染力。这些病毒品系在上述十字花科蔬菜上所引致的花叶病状都很相像,很难分辨. 根据在鑒別寄主(烟草、心叶烟和白菜)上的病状表現,少量(77个罹病标本)的試驗結果說明甘藍病毒2号的“油菜毒系”类在本区發生最多,分布最广。甘藍病毒2号的“芜菁毒系”类和黄瓜病毒1号类(包括2个毒系)發生較少,前者的分布較广,在广州郊区和新会县俱有發現,后者只在广州郊区5个相邻的乡村發現。
Maucao, Brassica juncea, cabbage, Brassica campestris and radish, etc. in the outskirts of Guangzhou, Hetang Township in Xinhui County and Foshan suburb in Nanhai County are generally infected with Mosaic Diseases. According to the host range, pathology and the physical properties of the virus, The identification of the disease was caused by two lines of Brassica virus 2 and two lines of Cucumis virus 1. Among the two lines belonging to cabbage virus 2, Chamber-lain (1936) (also referred to as “Brassica campestris”) and another similar to the canola mosaic virus (Lingli and Yang, 1940, 1941) One of the two strains belonging to cucumber virus 1 was completely deficient in infectivity on cruciferous vegetables and the other had weak infectivity and all of these mosaic strains were caused by the above mosaic disease on the cruciferous vegetables Very similar and difficult to discern.A small number of (77 diseased specimens) test results indicate that the “Brassica napus” class of cabbage virus 2 is present in this region based on the pathological findings on the differentiating hosts (tobacco, leaf-leaf tobacco and cabbage) Most occurred, the most widely distributed. “Brassica napus virus No. 2” category And cucumber virus type 1 (including 2 poisonous strains) occurred less frequently. The former was widely distributed and found in both suburbs of Guangzhou and Xinhui, the latter only found in 5 neighboring villages in the suburbs of Guangzhou.