UNSPECIFIED (1981) Frequencies of nodulation response alleles, Rj2 and Rj4, in soybean plant introduction and breeding lines. Other. U.S. Department of Agriculture, USA.
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Abstract
The RJ2 and RJ4 alíeles in soybeans (Glycine max (L.) Merr.) condition ineffective nodulation with particular strains of Rhizobium japonicum (Kirchner) Buchanan. The frequencies of both these alíeles declined progressively with advancing levels of breeding for agronomic performance in the United States. This result suggests either a negative adaptive value for RJ2 andßj^ or genetic linkage of these alíeles with other alíeles having a negative adaptive value for agronomic performance. To aid soybean breeders in the choice of breeding lines, we have presented the genetic constitution for the RJ2 andßj^ loci for 847 plant introduction lines and the lines in the 1979 preliminary and uniform tests. The geographic pattern of the frequency of these alíeles in Asian soybean populations suggests that ecotypes of the host and microsymbiont coevolved under selection pressure for mutual symbiotic compatibility
| Item Type: | Monograph (Other) |
|---|---|
| Uncontrolled Keywords: | Coevolution, Glycine max (L.) Merr., natural selection, nitrogen fixation, Rhizobium, japonicum (Kirchner) Buchanan, symbiosis |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | UNSPECIFIED |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 25 Oct 2012 07:51 |
| Last Modified: | 25 Oct 2012 07:51 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8530 |
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