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在GT1开割芽接树上注射四环素及青霉素两种药液,对照树注射清水或不注射任何东西,经割胶测定,注射一次或二次青霉素及四环素的胶树,其胶乳及干胶产量均比对照胶树为高,而且持续时间均达半年以上。电子显微镜检查,在GT1褐皮病树韧皮部筛管和乳管细胞切片中都较普遍地发现类立克次氏体(RLO)。其大小为100—2400毫微米,在RRIM600病树韧皮部筛管和乳管中的类立克次氏体大小为275—1395毫微米(nm),限界膜厚度约为20毫微米。在GT1和RRIM600健康树韧皮部筛管及乳管细胞切片中均未见有RLO的存在。由于上述两个方面的试验结果,我们初步认为类立克次氏体可能是橡胶树褐皮病的病原之一。
Injection of tetracycline and penicillin into the GT1 open cut tree, the control tree injection of water or do not inject anything, measured by tapping, once or twice injection of penicillin and tetracycline gum tree, the latex and adhesive yield than Control gum tree is high, and the duration of up to more than six months. Electron microscopy revealed Rickettsia-like organisms (RLO) more commonly found in the GT1 xerophthalmic phloem screens and ductal cell sections. It measures 100-2400 nm in size and has a rickettian-like size 275-1395 nm in the phimosis screens and ducts of the RRIM 600 diseased tree, with a limiting membrane thickness of approximately 20 nm. No RLO was found in the phloem sieves and ducts of GT1 and RRIM600 healthy tree phloem. As a result of the above two aspects of the test results, we initially believe that rickettsia may be one of the pathogen of rubber tree brown disease.