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The genetics of resistance to two strains of bean common mosaic virus in three cultivars of Phaseolus vulgaris L.

Published online by Cambridge University Press:  27 March 2009

N. L. Innes  and
D. G. A. Walkey
N. L. Innes
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick, CF35 9EF
D. G. A. Walkey
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick, CF35 9EF
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Summary

A high level of resistance to the bean common mosaic virus strains NL3 and NL4 when inoculated separately or together was confirmed in the cultivars Turkish Brown, Valja and 1750–73. Following crosses between the susceptible cv. The Prince and all three resistant cultivars, inoculation of F2 and F3 populations revealed that the cvs Turkish Brown and Valja each differed from The Prince in being homozygous for a major recessive gene conferring resistance to both NL3 and NL4. Homology tests indicated that the same gene was present in both Turkish Brown and Valja. Polygenes in Turkish Brown and Valja also appeared to confer some resistance to NL3, or environmental variation led to continuous distribution patterns in the F2's of resistant parents crossed with The Prince. Although a major recessive gene controlled resistance to NL3 in cv. 1750–73, it differed from that in the two other resistant cultivars. In addition, cv. 1750–73 carried a dominant gene determining reaction to the virus; probably the I gene originally found in Corbett Refugee. An attempt is made to relate these results to Drijfhout's (1978) gene-for-gene model. Using Drijfhout's gene nomenclature all the cultivars tested appear to carry the strain nonspecific gene bc-u. Further genetical tests will be necessary to determine with certainty which, if any, of Drijfhout's strain-specific resistant bc-genes are present in the three resistant cultivars studied here.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 3 , December 1980 , pp. 619 - 630
Copyright
Copyright © Cambridge University Press 1980

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References

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