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Contents \'^\ /^/ 



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Contributors to Volume 2 .Ss>. . . . a y-'. v 



Contents of Volume 1 xv 



Contents of Volume 3 xvi 



I. The Process of Infection and Virus Synthesis with Tobacco Mosaic 



Virus and Other Plant Viruses by Samuel G. Wildman 1 



I. Introduction 1 



II. General Features of the Host- Virus System 2 



A. Organization of Plant Leaves 2 



B. Exclusion of Some Plant Viruses from Dividing Cells and 

 Embryonic Tissues 4 



C. Strains of Plant Viruses and Host Eeactions 4 



III. Behavior of Plant Viruses in a Local Lesion Host 5 



A. Local Lesion Assay for Infectivity 5 



B. The Susceptible Site and the Initial Act of Infection 6 



C. Specific Infectivity of Tobacco Mosaic Virus 7 



D. What Cells Serve as Entry Ports for Virus? 8 



E. Nature of Virus Attachment at Susceptible Site 9 



F. Intracellular Development of Viruses as Deduced from 

 Irradiation Experiments 10 



G. Inactivation of Tobacco Mosaic Virus by Ultraviolet Light 10 

 H. Changes in Virus Behavior during Early Stages of Infec- 

 tion 13 



I. Inactivation of Tobacco Mosaic Virus Infectious Nucleic 



Acid 14 



J. Spread of Infectivity from Focus of Infection 16 



K. Yield of Virus per Infected Cell 18 



L. Nature of Infectious Material 19 



M. Is Tobacco Mcsaic Virus Extracted from Lesions Identical 



with Tobacco Mosaic Virus Extracted from Systemic Hosts? 20 



IV. Behavior of Plant Viruses in a Systemic Host 21 



A. Quantities of Virus Synthesized 21 



B. Direct Observation of Virus Activity in Hair Cells 22 



C. Course of Virus Synthesis in Directly Inoculated Leaves. . 24 



D. Necrosis and Phloem Cells 26 



E. Effect of Virus Synthesis on Composition of Host Protems 27 



F. X-Protein 28 



V. Summary of Steps Involved in Plant Virus Reproduction 28 



References 29 



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