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158 Baleshwar <strong>Singh</strong>ReferencesDuveiller, E., Myajima, K, Snacken, F., Autrique, A. and Maraite,H. (1988).' Characteristics of Pseudomonas fuscovaginae anddifferentiation from other fluorescent pseudomonads occurringon rice in Burundi. J. Phytopathol. 122: 97-107.Lundrgaard, T. (1973). A method for detection of Xanthomonascampestris (Pammel) Dawson in Brassica seeds. StatensPla.ntetilsyn 21 : 34-38.Randhawa, P. and Schaad, N.W. (1984). Selective isolation ofXanthomonas campestris pv. campestris from crucifer seeds.Phytopathology 74: 268-272.,Saettler, A.W. (1971). Seedling infection as an aid in identifyingbean blight bacteria. Plant Dis. Reporter 55: 703-706.Srinivasan, M.C., Neergaard, P. and Mathur, S.B. (1971). Atechniqe for detection of Xanthomonas campestris in seedhealth testing of crucifers. Seed Sci. & Tech. 1 : 853-859.Taylor, J.D. (1970). Bacteriophage and serological methods for theidentification of Pseudomonas phaseolicoZa (Burkh.) Dowson.Annals Applied BioI. 66 : 387-395. .Thyr, BD: (1969). Assaying tomato seed for Corynebacteriummichiganense. Plant Dis. Reporter 53: 858-860.Venette, J.R., Lampa, R.S., Albaugh, D.A. and Nayes, J.B. (1987).Presumptive procedure (dome test) for detection of seedbornebacterial pathogens in dry beans. Plant Disease 71:984-990.Wharton, A.L. (1967). D~tection of infection by Pseudomonasphaseolicola (Burkh:) Dowson in white seeded dwarf seedstocks. Annals ~pplied BioI. 60 : 305-312.
Symptoms Cause,d by Plant VirusesD.B. ParakhIntroductionViruses constitute the most serious pathological problems ofthe living world. In agriculture, they were' recognised as ' growthreducingfactors' for a long time. They are, therefore, the subjectof intensive research. Present knowledge about viruses is that theyare infectious agents (often cause disease), invisible with lightmicroscope (sub-microscopic), small enough to pass through abacteria-proof filter, lacking a metabolism of their own anddependent on living host cells for multiplication~ Virusesconstitute small packages of genetic information of either nucleicacid (ribonucleic acid, RNA or de-oxy ribonucleic acid! DNA)encapsidated together or separately and enclosed in a coat of oneor more than one types of protein. Few viruses have a lipoprotein,besides its nucleic acid and protein.Plant-virus interactions'1There is an intimate relationship between a virus and its hostplant. The process of multiplication of virus in its host cellsdisorganizes the host's physiology and results in 'disease'.. Thevirus is then a pathogen causing disease. Once the plant isdiseased, the virus multiplication leads. to visible deviations orsymptoms. A symptom is defined as any perceptible change inthe plant or its functions, indicating a disturbance in the normalcourse of the physiological process. The science of the stuc4f ofsymptoms is called symptomatology. Different kinds of symptoms
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Page14. Genebank Management System
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CONTRIBUTORS(Number in parentheses
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IIConservation of Plant Genetic Res
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Conservation of Plant Genetic Resou
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Centres of Origin and Diversity of
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Need For Exchange of Plant Genetic
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Need For Exchange of Plant Genetic
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Principles of Plant Introduction an
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Principles of Plant Introduction an
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Principles and Concepts of Plant Qu
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Plant Quarnatine Regulations and th
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Medium and Long-term Storage of See
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IIPromising Introductions and Prior
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Promising Introductions and Priorti
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Promising Introductions and Priorti
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Use of Tissue Culture Techniques in
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LIse of Tissue Culture Techniques i
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Promising Introductions in Horticul
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Promising Introductions and Priorit
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Priorities for Promising Introducti
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Priorities for Promising Plant Intr
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Page 121 and 122: IIGenebank Management System (GMS)
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Page 179 and 180: Symptoms of Insect Damage in Crops
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Detection Techniques for Plant Para
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Detection Techniques jar. Plant Par
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Treatment Schedules for Eradication
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Treatment Schedules jar Eradication
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Plant Genetic Resources activities
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IIIntellectual Property Rights: Pro
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Intellectual J:roperty Rights,' Pro
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Intellectual Property Rights : Prot
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Intellectual Property Rights : Prot
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The Indian National Gene Bank 243sp
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The Indian National Gene Bank 245In
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The Indian National Gene Bank' 247c
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LIST OF PARTICIPANTS OF TRAINING CO
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BP Singh

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