Dinitrogen fixation associated with disomic chromosome substitution lines of spring wheat

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Abstract
The modification of the genotype of the Cadet and Rescue cultivars of spring wheat (Triticum aestivum L. emend. Thell) by disomic chromosome substitution altered the amount of plant nitrogen derived from dinitrogen fixation by the associated bacterium in a phytotron experiment. With the exception of the C-R5B line, inoculation of the parent Cadet or its substitution lines with either the bacillus C-11-25 or Azospirillum brasilense increased plant dry matter and the total N yield. Rescue lines were unaffected by inoculation unless genotypically altered by substitution of the 5B or 5D chromosome from Cadet. Different substitution lines reacted uniquely to inoculation with the specific bacteria: C-R2A and R-C2D promoted greater dinitrogen fixation by A. brasilense; C-R5D, R-C5B, and R-C5D promoted greater dinitrogen fixation by the C-11-25 bacillus. Both bacteria had high and identical levels of dinitrogen fixation in association with the C-R2D line; neither bacterium fixed N when grown in association with the C-R5B, Rescue, or R-C2A lines. Although the ability of spring wheat to induce dinitrogen fixation in associated bacteria is influenced by chromosomes 5B (which controls root rot reaction) and 5D, it does not appear to be directly related to reaction to common root rot.

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