Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-09T07:28:31.731Z Has data issue: false hasContentIssue false
  • English
  • Français

Inheritance of Resistance to Blight (Phytophthora infestans) in Potatoes: Strain C and its Relationships*

Published online by Cambridge University Press:  11 June 2012

William Black
William Black
Affiliation:
Scottish Plant Breeding Station, Corstorphine, Edinburgh.
Get access

Synopsis

The common strain A of the blight fungus (Phytophthora infestans) and two new strains, B and C, have been employed in testing potato varieties and seedling progenies, bred from the wild species S. demissum, for resistance to the disease. The reactions of seedlings to infection with strain C are compared with those of strains A and B. The C strain is shown to be more virulent than A, since it attacks some A resistant as well as all A susceptible plants. Likewise the B strain is more virulent than A. The difference between the pathogenicity of strains B and C, however, is not one of degree of virulence; one plant may be B resistant-C susceptible, while another may be B susceptible-C resistant. This difference is essentially of a qualitative nature. Resistance to these strains, which is manifested by the hypersensitive condition of the plant's cells, is produced in the presence of three major independent genes, Re, Rb and Rbc, which confer resistance to strains A and C, A and B, and A, B and C respectively. Segregations in each case are similar in type, and are characterised by an excess of recessive individuals.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 64 , Issue 2 , 1950 , pp. 216 - 228
Copyright
Copyright © Royal Society of Edinburgh 1950

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

This paper was assisted by a grant from the Carnegie Trust for the Universities of Scotland.

References

References to Literature

Black, W., 1943. “Inheritance of Resistance to Two Strains of Blight (Phytophthora infestans de Bary) in Potatoes”, Trans. Roy. Soc. Edin., LXI, 137–I47Google Scholar
Black, W., 1945. “Inheritance of Resistance to Blight (Phytophthora infestans) in Potatoes: Unbalanced Segregations”, Proc. Roy. Soc. Edin., B, LXII, 171–181.Google Scholar
Black, W., 1947. “Blight in Relation to Potato Breeding”, Ann. Appl. Biol., xxxiv, 631–633.Google Scholar
Black, W., 1949. “Inheritance of Resistance to Blight (Phytophthora infestans) in Potatoes: Comparison of A and B Strains”, Proc. Roy. Soc. Edin., B, LXIII, 290–301.Google Scholar
Black, W., And Haigh, J. C, 1947. “Strains of Potato Blight in Scotland”, Scottish Agriculture, xxvn, 49–50.Google Scholar
Bruyn, H. L. G. D E, 1947. “Het Rassenprobleem Bij Phytophthora infestans”, Vakbl. Biol., xxvn, 147–152.Google Scholar
Keay, M. A., 1949. “Report on the Material of Phytophthora infestans (Mont.) de Bary”, collected by the National Agricultural Advisory Service, in 1948, for the Commonwealth Potato Station, Cambridge.Google Scholar
Müller, K. O., 1941. “Physiologisch-genetisch Untersuchungen zur Analyse der Phytophthora-Resistenz der Kartoffel”, Proc. Vllth Int. Genet. Congr., Edinburgh, 1939, pp. 222–223.Google Scholar
Müller, K. O., And behr, L., 1949. “Mechanism’ of Phytophthora Resistance of Potatoes”, Nature, London, CLXIII, 498–499.CrossRefGoogle Scholar
Müller, K. O., And Börger, H., 1941. “Experimented Untersuchungen über die Phytophthora-Resistenz der Kartoffelzugleich ein Beitrag zum Problem der ‘erworbenen Resistenz’ im Pflanzenreich”, Arb. Biol. Reichsanst. Land.-u.-Forstw., Berlin, XXIII, 189–231.Google Scholar
Reddick, D., And Mills, W., 1938. “Building up Virulence in Phytophthora infestans”, Amer. Pot. Journ., xv, 29–34.CrossRefGoogle Scholar