通过菟丝子成功地将黄龙病病原从柑桔传到长春花
THE PROCARYOTE ASSOCIATED WITH CITRUS HUANGLUNGBIN IN CHINA IS TRANSMITTED SUCCESSFULLY FROM CITRUS TO PERIWINKLE BY DODDER
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摘要: 黄龙病(黄梢病)是我国南方柑桔生产上的一种危险性病害。在证明本病的病原可能是一种原核微生物(称为类立克次体或类细菌)及其传播媒介是柑桔木虱之后,我们积极进行本病原的草本寄主的研究。1981年以来,以木虱传染的柑桔病苗为毒源植物,以柑桔木虱和两种菟丝子(草地菟丝子和日本菟丝子)为传染媒介,进行八种草本植物的传染试验。试验结果证明,只有草地菟丝子才能成功地将黄龙病病原从柑桔传到草本植物长春花上,引起叶片局部黄化乃至叶片完全黄化和新生叶片变小的典型病状,其潜育期为3~6月。长春花病株叶脉的超薄切片在电子显微镜下观察的结果,证明在其筛管细胞中存在黄龙病的病原,其菌体的形态、大小和其壁膜结构和厚度均与柑桔病苗上所见的相同;但其数量远比柑桔病苗上的多。这说明长春花是黄龙病病原大量增殖的适宜草本寄主,可能是进一步研究的良好材料。而柑桔木虱和日本菟丝子都不能将黄龙病病原从柑桔传到草本寄主上。Abstract: Huangluugbin is a serere disease of citrus in South China.After we found out that the pathogen was the procaryotic microorganism called rickettsia-like organism or bacteria-like organism in the sieve cells of leaf vein from citrus diseased plant under electron microscope, we also found out the same procaryote in the ultra-thin sections of the salivary gland of psylla (Diapherina citri) which were feeded on the deseaed citrus seedlings and in the sieve cells of the deseased citrus seedlings which were transmitted by the pathogen carrier-psylla.Recently, by using psylla and two kinds of dodders (Cuscuta compestris and c.japonica) as the vector or vector bridge, we studied the transmission of Huanglungbin procaryote from diseased citrus seedling to eight kinds of herbaceous plants. The result show ed that there was only Cuscuta compestris which could transmit procaryote from citrus to periwinkle (Catharanthus roseus).24 out of 25 tested periwinkles showed the typical symptoms, consisting of the first symptom of yellowing vein, then the localized yellowing along the vein and the margin of leaf, and finally the whole leaf yellowing during 3 to 6 month after transmission.Under electron microscope there were numerous bodies of procaryote in the sieve cells from ultra-thin sections of leaf vein of infected periwinkle plant. These pre-caryotes showed spherical, elongate or filamentous shape, 40-600nm, in diameter and 150-1800nm. in length, and with an envelop censisting of a threelayer membrane that was 20-25nm.in thickness.The morphology of procaryote was the same as that of citrus Huanglungbin seedling. In addition, several attempts to transmit procaryote from citrus to periwinkles by Cuscuta japonica and to other seven kinds of herbaceous plants by psylla were unsuccessful.
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[7] 戴明月、陈乃荣、陈循渊、廖长青、蔡明段、沈菊英、陈作义,1982,柑桔黄龙病传病昆虫木虱的研究。中国柑桔3,1-2。 [12] Raychaudhun, S.P., T.K.Nariani, S.K.Ghosh, S.M.viswanath and D.Kumar.1974. Recent studies on Citrus greening in India,P.53-56,In proc,6th Couf, IOCV., Univ. Calif., Dav.Agric.Sei.Richmond.
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