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棉花黄萎病(Verticillium albo-atrum Reinke et Berth)的分佈日渐扩大。有人认为种子可以传播病原(1,2,3,6,7,8),但很难从种子上分离到这个病原菌。因此,关于这个病害的种子传病问题颇多争论(4,5)。其他作物如茄子和番茄的黄萎病也是由于这个病菌所导致。它们的种子带菌率达到25-31％以至44％,早经证实。究竟棉籽是否能以传带黄萎菌,颇须加以研究。这不仅是一个检疫方面的问题,而且是研究侵染循环的一个关键性环节。我们曾以病株青铃内剥出新鲜棉籽,迸行分离。用低倍显微镜直接检查棉籽,偶然见到轮枝菌(Verticillium sp.)的轮生胞子梗(照片Ⅰ)。但由于常常有其
The distribution of Verticillium albo-atrum Reinke et Berth is expanding. Some people think that the seeds can spread the pathogen (1,2,3,6,7,8), but it is difficult to isolate the pathogen from the seed. Therefore, there is a lot of debate over the problem of seed transmission in this disease (4, 5). Verticillium wilt of other crops such as eggplant and tomato is also caused by this bacterium. Their seed carrier rate of 25-31% to 44%, as early proven. Whether cottonseed can pass on Verticillium wilt, it is necessary to be studied. This is not only a quarantine issue, but also a key aspect of studying the cycle of infection. We have stripped of fresh cottonseed within the diseased plant and separated it. Cotton seeds were examined directly with a low magnification microscope, occasionally seen in the staghosporidium of Verticillium sp. (Photograph I). But often because of it