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杨树花叶病(Poplar mosaic virus)简称P. M. V,在欧洲许多国家均有发生(Luisoni,1970),加拿大、美国也有报道。在意大利北部,花叶病对美州黑杨类危害十分严重。因此,开展抗病无性系的选择很有意义。但由于花叶病毒受自然条件影响,发病比较缓慢,在短时间内,要根据试验得出各无性系对花叶病毒易感性结果是很困难的。本文是意大利杨树研究所进行的杨树无性系对花叶病毒反应的初步研究结果。试验的主要设计包括: 1.在苗圃内进行10年杨树无性系对花叶病反应的观察。 2.花叶病的危害,主要抗花叶病杨树无性系的确定。 3.各个无性系对花叶病易感性的早期测定。根据观察和测试,可按花叶病对杨树无性系为害强度分为三级:
Poplar mosaic virus, P. M. V, has been reported in many European countries (Luisoni, 1970), and is also reported in Canada and the United States. In northern Italy, mosaic disease is very serious harm to the American Black Poplar. Therefore, to carry out the selection of disease-resistant clones makes sense. However, due to the impact of natural conditions Mosaic virus, the incidence is relatively slow, in a short period of time, according to the experiment obtained clones susceptible to mosaic virus results is very difficult. This article is the result of a preliminary study on the response of poplar clones to mosaic virus conducted by the Poplar Institute of Italy. The main design of the trial includes: 1. Observation of Mosaic Disease Response to 10-Year Poplar Clones in Nursery. 2. Mosaic damage, the main anti-mosaic disease poplar clones to determine. 3. The early determination of the susceptibility of each clonal mosaic disease. According to observations and tests, according to mosaic disease poplar clonal damage intensity is divided into three levels: