Vegetable Crop Diseases by G. R. Dixon (auth.)

By G. R. Dixon (auth.)

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Extra info for Vegetable Crop Diseases

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Diseases of Vegetable Crops. McGraw-Hill, New York. Wheeler, B. E. J. (1976). Diseases in Crops. Institute of Biology Studies in Biology no. 64. Edward Arnold, London. 2 Invasion, Colonisation and Symptom Development This chapter describes how pathogens infect and colonise a host and the metabolic changes which take place in the diseased plant leading to the visual expression of symptoms. Infection can be said to start as soon as the host and pathogen are in contact and interact with each other.

Similarly, there were increased concentrations of free amino acids in the xylem sap of infected plants, but analysis of culture filtrates showed them to contain little free amino nitrogen, indicating that stimulation of amino acid content was a host-mediated effect. Similar reactions have been demonstrated for bacterial and viral host-parasite combinations. An accumulation of methionine in the halo region of beans (Phaseolus vulgaris) infected with Pseudomonas phaseolicola is thought to be evidence that the failure to incorporate this sulphur amino acid into protein is an initial step in the development of chlorosis and necrosis.

Shepherd, R. , Wakeman, R. J. and Ramanko, R. R. (1968). Virology 36, 150-2. Smith, K. M. (1960). Plant Viruses. Methuen, London. Smith, R. E. and Boncquet, P. A. Phytopathology S, 103-7. Stapp, C. Bacterial Plant Pathogens. Oxford University Press, London. Tarr, S. A. J. (1972). The Principles of Plant Pathology. Macmillan, London. Webster, J. /ntroduction to Fungi Cambridge University Press, London. Westcott, C. Plant Disease Handbook. J. Wood, R. K. S. (1961)Physiological Plant Pathology. Blackwell Scientific Publications, Oxford.

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