【摘要】 枣疯病树韧皮组织的冰冻断裂样品,经扫描电镜观察揭示,病树韧皮组织的筛管中存在类支原体,而健树韧皮组织筛管中则未观察到。用此方法观察到的类支原体,其大小和形状,与文献中利用其它方法获得的结果基本相符。讨论了这种方法的优、缺点。更多还原

【Abstract】 Scanning electron microscopic observa-tion on freeze-fractured phloem tissues ofwitche’s-broom-diseased and of healthy juju-be (Zizyphus jujuba Mill.) revealed thatMLO was present in the sieve tube elementsof diseased plant, but not in healthy ones atthe same age. The size and shape of the MLO in free-ze-fractured samples from diseased jujubesobserved in SEM corresponed with those re-sults obtained by other methods in litera-ture. The advatages and disadvantages ofscanning electron microscopy of freeze-frac-tured sample were discussed.更多还原