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水稻白叶枯菌(Xanthomonas oryzae Dawson)重复侵染时,往往先侵害叶片,其侵染途径,一般都由叶片前端的水孔和气孔器侵入。水稻叶片顶端没有明显的排水器,但是分布一些水孔。这些水孔较大,排列较不规则。用人工喷雾接种的白叶枯细菌,由水孔和其他一些气孔器侵入后,通过靠近水孔的管胞,进入大小叶脉的导管。叶片上的许多横向小脉,对病菌的扩散也有很大关系。有时在尚未完全分化的、生活的管胞或导管细胞内也可看到病菌。用针刺接种的,发病较快,而扩散方式基本上与喷雾接种的一样。
When Xanthomonas oryzae Dawson repeatedly infects, it is often the first to invade the leaves, and the infection pathways are usually invaded by water holes and stomata at the front of the leaves. There is no obvious drainage at the top of rice leaves, but some water holes are distributed. These holes are larger and less regularly arranged. Bacterially-inoculated with Bacillus subtilis bacteria, by the water hole and some other stomatal invasion, through the water hole near the tracheids, into the size of the veins of the catheter. Many lateral veins on the veins, the proliferation of bacteria also have a lot to do. Germs can sometimes be found in tracheids or ductal cells that are not yet fully differentiated. Vaccination with acupuncture, the incidence is faster, and the proliferation of basically the same with the spray inoculation.