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Agronomic Evaluation of Non-Nodulating and Hypernodulating Mutants of Soybean

Ciba-Geigy Seed Div., 1301 W. Washington, Bloomington, IL 61701
Dep. of Agronomy, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
Plant Physiology and Genetics Res. Unit, USDA-ARS and Dep. of Agronomy, 1201 W. Gregory, Urbana, IL 61801

^* Corresponding author.

Enhanced nodulation and dinitrogen fixation by soybean [Glycine max (L.) Merr.] has been proposed to increase yield relative to normal nodulating types. This study was conducted to determine if two hypernodulating soybean mutants (NOD4 and NODI-3) were capable of increased yield, compared with normal nodulating cultivars Williams 82 and Hobbit 87, and a non-nodulating cheek (NNS). Performance data were collected in 1990 and 1991 from a replicated design using two row-widths, 18 and 76 cm, at three locations in east central Illinois, Dwight, Champaign and Urbana. No significant differences in yield were found between the hypernodulating mutants and the nonnodulating cheek. Yields of the normal nodulating cultivars were significantly higher than for the nodulation mutants. A highly significant year to location interaction was noted for all parameters measured, but row width did not significantly affect seed yield. Protein concentration was significantly greater for NOD4 than for Williams 82, but lower seed yield resulted in less total N accumulation in seed of NOD4. The hypernodulated mutants (NOD4 and NOD1-3) were agronomically inferior to Williams 82 and Hobbit 87, suggesting that these mutants likely have other deleterious mutations that override any possible benefit of enhanced nodulation.

Received for publication April 15, 1993.