By G. R. Dixon (auth.)
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Extra resources for Vegetable Crop Diseases
Example text
Other organic and inorganic materials accumulate around lesions, and there is evidence for the transport of these materials from healthy parts of the plant to infected areas. Areas of such accumulation around lesions frequently remain green after the rest of the leaf has turned chlorotic, indicating that these cells are benefitting from the inflow of nutrient, which exceeds that required by the pathogen for growth. 4 Hormonal changes The syndrome of many diseases includes symptoms indicative of altered hormone metabolism, for example epinasty, excessive elongation, fasciation, galls, green islands and overgrowths.
Albo-atrnm. Leaf abscission in roses infected with Diplocarpon rosae (black spot)has been associated with raised levels of ethylene. Some workers suggest that ethylene could be implicated in resistance reactions through (1) induction of necrotic reactions by the liberation of peroxidase enzymes, which oxidise wall-bound glucose and amino acids; (2) the stimulated production of polyphenoloxidase, which oxidises phenolic compounds to produce antifungal quinones; (3) induction of phytoalexins, for example stimulation of phenylalanine ammonia lyase activity in pea tissue has been linked to the formation of pisatin.
Florida University Press, Gainesville, Fla, pp. 118-47. Hawker, L. E. (1966). Fungi Hutchinson, London. lwanowsky, D. St Petersb. Acad. imp. Sci. BulL 35, 67-70. 18 Vegetable Crop Diseases Mayer, A. E. (1882). Voorloopie Meded. Landbou. Tijdschr. 359-64. Pal, B. P. and Nath, P. (1935). Indian J. agric. Sci S, 517-22. S. and Matthews, R. E. F. (1966). Virology 28, 563~70. Shepherd, R. , Wakeman, R. J. and Ramanko, R. R. (1968). Virology 36, 150-2. Smith, K. M. (1960). Plant Viruses. Methuen, London.