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核桃丛枝病是一种发生在日本、满洲(即我国东北)、英国的当地黑核桃和灰核桃的黄化型丛枝病。用电子显微镜观测,在核桃的韧皮组织中表明,类菌质体(MLO)存在于病株之中,而健康植株叶和茎的韧皮组织未曾发现。类菌质体是多型的,长度变化于150—1,000毫微米之间,外被一层柔软的三层单元膜,以球形或卵园形占优势,而管状的具有明显的筛板。有些截面清晰地表明,类菌质体组织内有核糖体和类去氧核糖核酸。非病毒粒存在,这与类菌质体发现于病株中而不存在于健康植株是相一致的,从而认为类菌质体多半就是致病的原因。文内还讨论了核桃丛枝病与薄壳山核桃丛枝病可能有关。
Walnut birch disease is a yellowing brouch disease that occurs in Japan, Manchuria (northeastern China), native black walnut and ash walnut in the United Kingdom. Observation with an electron microscope revealed that the mycoplasma (MLO) was present in diseased plants in the bast phloem of walnuts, whereas the phloem tissues of leaves and stems of healthy plants were not found. Mycoplasts are polymorphic and vary in length between 150 and 1,000 nm. They are covered with a soft, three-layer unit membrane that dominates the shape of a sphere or ovoid, while the tube has a clear sieve. Some sections clearly show that there are ribosomes and deoxyribonucleic acids in the mycoplasma tissue. The presence of non-virulent particles, which is found in the plant-like strains of bacteria but not in healthy plants is consistent, so that most of the protoplast is the cause of the disease. The article also discussed the walnut witches broom disease and thin walnut witches broom may be related.