【摘要】 <正> 在植物病毒中,烟草花叶病毒(TMV)是研究得最多的一种。从Stanley的工作开始到目前的20几年内,已经积累了有关TMV的大量资料。在化学方面,TMV普通株的氨基酸排列顺序已经完全阐明。在物化方面,它的四级结构,分子形状也研究得很更多还原

【Abstract】 (1) Some chemical and physico-chemical properties of four strains of tobacco mosaic virus from plants of widely separated families-（1） Nicotiana tabacum mosaic virus-TMV-1, （2） Brassica campestris L. （Youcai） mosaic virus-YMV₁₅, （3） Rehmannia glutinosa Libosch. var. huaichingensis Tsas （Dihuang） degeneration virus-DDV and （4） Populus tomentosa Carr. bushy top virus-PV-have been studied and compared with those of common tobacco mosaic virus TMV-C.（2） In corroboration of an earlier study on host reactions and serological properties, chemical and physico-chemical evidences likewise bear out the close kinship between these different isolates and common TMV, suggesting that they are different strains of the same virus. The points of similarity are, （1） identical C-terminal threonine, （2） similar ultraviolet absorption spectra and （3） characteristic rod shape as deduced from flow birefringence measurements and observed directly under the electron microscope.（3） Among the four strains, YMV₁₅ differs from the others in several respects: （1） the ease with which the virus rods aggregate to form thick bundles and the tendency, stronger than common TMV, to form tactoids, （2） the presence of histidine and methionine in the primary structure of the virus protein and （3） notable differences in the "finger-print" and the N-terminal map of the enzyme digest of the protein component.（4） The iso-electric points of YMV₁₅ and DDV are much higher than those of the other strains studied. DDV is also prone to aggregate. These are in line with the serological closeness found in an earlier study.（5） A method has been found to dissociate the nucleic acid and the protein components of the virus with chloroethanol.更多还原