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- W2059681486 abstract "Summary The symbiosis of legumes with rhizobia has been subject to the selection pressures of 200 million years of evolution. Evidence from soybean of ecogeographic distribution of nodulation compatibilities with specific Rhizobium strains indicates that the coevolution of host and microsymbiont has played a role in the evolution of compatibilities. Some strains of bradyrhizobia that nodulate soybean also produce a substance called rhizobitoxine that interferes with chlorophyll synthesis. The Rj 4 allele in soybean conditions an ineffective nodulation response with specific strains of bradyrhizobia while the rj 4 allele permits normal nodulation with these strains. Two near isogenic soybean lines (99.95 % genetically identical) differing specifically in the Rj 4 vs. 774 alleles have been synthesized and used to test an array of chlorosis-inducing and non-chlorosis-inducing bradyrhizobia for response with the Rj 4 allele. The Rj 4 allele was found to interdict nodulation with 33.3 % of the chlorosis inducing rhizobia and only 2.7 % of the nonchlorosis inducing rhizobia. Thus, the Rj 4 allele may have a positive value to the host plant in areas with significant populations of chlorosis-inducing rhizobia by protecting the plant from nodulation with some of these rhizobia. The frequency of ineffective nodulation with the chlorosis-inducing strain USDA61 shows a progressive loss with domestication from the wild species Glycine soja (63 %) to the Asiatic plant introductions of G. max (26 %), and with selection for agronomic types in North America as demonstrated by the preliminary test lines (13.7 %) and the more highly selected uniform test lines (8.5 %). This may be an example of the loss of rhizobial specificity in a plant species occurring in historic time." @default.
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- W2059681486 date "1988-05-01" @default.
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- W2059681486 title "Role of the Nodulation Restrictive Allele Rj4, in Soybean Evolution" @default.
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- W2059681486 doi "https://doi.org/10.1016/s0176-1617(88)80061-0" @default.
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