1887

Abstract

SUMMARY: Extracts of the polyphenolic fractions of the water-soluble metabolites (that is, the complex mixtures of plant phenols extracted by ethyl acetate) were prepared from apple and pear varieties characterized by different degrees of resistance to the scab pathogens. Qualitative differences were chiefly interspecific and extracts of resistant varieties did not contain major components lacking in those of less- resistant varieties of the same species. Cultural reactions of distinct clones of each pathogen to the extracts, in the presence of various basal media, were observed. Growth and sporulation were inhibited independently by extracts of less-resistant as well as resistant host varieties. The clones were not equally susceptible, those of showing relationships between inhibition of sporulation by host polyphenols and their varietal host ranges. Fluctuations in pathogenicity of a clone of during storage in culture with periodic re-isolation from Williams pear were reflected in its reactions to the extracts. Both pathogens were capable of decomposing the polyphenols. The results suggested that qualitative and quantitative variations in the polyphenolic host metabolites, including differences in their relative proportions, in relation to nitrogenous and other nutritional factors, are of potential significance in the determination of pathogenicity and varietal resistance.

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/content/journal/micro/10.1099/00221287-17-1-120
1957-08-01
2022-01-25
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References

  1. Bradfield A. E., Flood A. E. 1949; The organic constituents of fruit plants. 1. An outline of a method of examination of the water and alcohol soluble constituents. Rep. E. Mailing Res. Sta p. 100
    [Google Scholar]
  2. Campbell P. N., Work T. S., Mellanby E. 1951; The isolation of a toxic substance from agenized wheat flour. Biochem. J 48:106
    [Google Scholar]
  3. Davis D., Waggoner P. E., Dimond A. E. 1953; Conjugated phenols in the Fusarium wilt syndrome. Nature; Lond: 172959
    [Google Scholar]
  4. Johnson G., Schaal L. A. 1952; Relation of chlorogenic acid to scab resistance in potatoes. Science 115:627
    [Google Scholar]
  5. Johnstone K. H. 1931; Observations on the varietal resistance of the apple to scab (Venturia inaequalis, Aderh.) with special reference to its physiological aspects. Part II. J. Pomol 9:195
    [Google Scholar]
  6. Kirkham D. S. 1954; Significance of the ratio between the water-soluble aromatic and nitrogen constituents of apple and pear in the host-parasite relationships of Venturia species. Nature; Lond: 173690
    [Google Scholar]
  7. Kirkham D. S. 1956; A culture technique for Venturia spp. and a turbidimetric method for the estimation of comparative sporulation. Nature; Lond: 178550
    [Google Scholar]
  8. Kirkham D. S. 1957; Relationships between cultural characters and pathogenicity in Venturia inaequalis and Venturia pirina. J. gen. Microbiol 16:360
    [Google Scholar]
  9. Leben C., Keitt G. W. 1948; Venturia inaequalis (Cke.) Wint. V. The influence of carbon and nitrogen sources and vitamins on growth in vitro. Amer. J. Bot 35:337
    [Google Scholar]
  10. Rudloff C. F. 1934; Venturia inaequalis (Cooke) Aderhold. 1. Der Einfluss des Nährbodens auf den Pilz und die Erhaltung seiner Pathogenitét. Gartenbauwiss 9:65
    [Google Scholar]
  11. Siebs E. 1955; Untersuchungen über die Schorfresistenz von Bimen. 111. Stofflicher Hinweis auf die Grundlagen der Blattschorfresistenz. Phytopath. Z 23:87
    [Google Scholar]
  12. Walker J. C., Stahman M. A. 1955; Chemical nature of disease resistance in plants. Annu. Rev. Pl. Physiol 6:351
    [Google Scholar]
  13. Wiltshire S. P. 1915; Infection and immunity studies on the apple and pear scab fungi (Venturia inaequalis and V. pirina). Ann. appl. Biol 1:335
    [Google Scholar]
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