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试验结果证明发生白叶枯病的病区稻种内有白叶枯病菌存活,同时也存在大量的能寄生消解病原细菌的噬菌体。病原细菌和噬菌体都存在于颖壳内;噬菌体的存活期比病原细菌为长,但病原细菌至少可以存活半年以上,作为下年初次侵染的来源。稻种内的细菌侵染秧苗的途径,目前尚不清楚,侵染以后有一个较长的潜育期是非常可能的。无病田的稻种内没有噬菌体或存活的病原菌,因此,检查稻种内噬菌体和活的细菌是很可靠的检验方法,已经在生产实践中得到证明。测定噬菌体是最简便的方法,灵敏度也高。由于吸附噬菌体的活细菌可在琼脂平板上形成噬菌斑,故测定噬斑菌的数目也是很好的检验方法,灵敏度虽不如测定游离噬菌体的方法简便,但它可以测出有活细菌的存在和它的数量。测定噬菌体的增殖也能准确检验是否有活细菌存在,但是方法还有待改进和简化。
The test results showed that the bacterial blight in the area of bacterial blight occurred in the bacterial blight survival, but also a large number of parasites can be digested pathogenic bacteria bacteriophage. Pathogenic bacteria and phage are present in the glume shell; phage survival than pathogenic bacteria for a long time, but the bacteria can survive at least six months or more, as a source of infection the next year. The way in which bacteria in rice seedlings infect seedlings is not known at this time and it is quite possible that there will be a long incubation period after the infection. There is no bacteriophage or viable pathogen in the disease-free rice, therefore, the examination of bacteriophage and live bacteria in rice is a very reliable test method, which has been proved in the production practice. Phage determination is the easiest method, the sensitivity is high. Since bacteriophage-bound live bacteria can form plaques on agar plates, the number of plaques detected is also a good test, although the sensitivity is not as easy as measuring free phage, but it can detect the presence of viable bacteria And its number. Determination of phage proliferation can also accurately detect the presence of live bacteria, but the method needs to be improved and simplified.