Major gene resistance to Phakopsora pachyrhizi in Glycine canescens, a wild relative of soybean

Burdon, J.J. (1988) Major gene resistance to Phakopsora pachyrhizi in Glycine canescens, a wild relative of soybean. Theoretical and Applied Genetics, 75 (6). pp. 923-928.

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An analysis of the genetic basis of resistance to the pathogen in a set of differential lines showed that resistance was dominant and controlled by genes with major phenotypic effects. Single resistance genes were detected in 6 out of 7 host lines. In the seventh line, 2 independently inherited genes for resistance were present. Intercrossing showed that some of these genes were inherited independently. In other cases, no F2 segregation was observed, implying that the resistance factors involved were closely linked or allelic. In yet other cases, distorted F2 segregation ratios were detected. It is suggested that these were generally caused by the wide nature of the crosses between morphologically and biochemically dissimilar accessions. At least 4 distinct resistance loci were detected in these lines of G. canescens. They were given the tentative gene symbols Lr1, Lr2, Lr3 and Lr4.

Item Type: Article
Additional Information: I am grateful to Drs. A.H.D. Brown and A.M.. Jarosz for their helpful advice during the course of this work, and to Mr. S.S. Speer for his technical assistance.
Uncontrolled Keywords: Race specific resistance, Allelism, Linkage, Segregation, Wide crosses
Author Affiliation: Div. Plant Industry, CSIRO, GPO Box 1600, Canberra, ACT 2601, Australia.
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Other Crops
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 06 Mar 2013 14:54
Last Modified: 06 Mar 2013 14:54
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