Summary
Nitrogen fixation is generally considered to be a major parameter of productivity in soybean (Glycine max). The aim of the investigations reported here was to analyse the genetic behaviour of this trait in view of its possible use as an indirect criterion of selection for productivity. Divergent selection for nitrogen fixation rate was carried out on F2 populations obtained from crosses between high-yielding cultivars that are well adapted to French climatic conditions. The genetic component of nitrogen fixation and yield was isolated through the analysis of (1) the nitrogen fixation potentials of the genotypes under controlled conditions and (2) the field yields under favourable conditions. Divergent selection resulted in two groups of genotypes whose nitrogen fixation abilities are significantly different. The F6 filial progeny obtained by single seed descent from the two groups displayed significantly different abilities for nitrogen fixation and for field productivity. The gain achieved for the nitrogen fixation activity with respect to the mean value of the parents ranged from 20% to 33% for the positive selection, depending on the crosses. The occurrence of positive and significant correlations between the level of nitrogen fixation activity in F2 plants and N2 fixation or yield in the F6 generation corroborates the relatively high heritability of this trait and suggests its possible use as an indirect selection criterion for yield.
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Communicated by A. R. Hallauer
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Burias, N., Planchon, C. Divergent selection for dinitrogen fixation and yield in soybean. Theoret. Appl. Genetics 83, 543–548 (1992). https://doi.org/10.1007/BF00226897
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DOI: https://doi.org/10.1007/BF00226897