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CROP BREEDING, GENETICS & CYTOLOGY

Inheritance and Allelism Analysis of Hypernodulating Genes in the NOD3-7 and NOD2-4 Soybean Mutants

^a Dep. of Crop Sciences, Univ. of Illinois, Urbana, IL 61801 USA
^b Soybean/Maize Germplasm, Pathology and Genetics Unit, USDA-ARS and Dep. of Crop Sciences, Univ. of Illinois, 1201 W. Gregory Dr., Urbana, IL 61801 USA

j-harper{at}uiuc.edu

Hypernodulating soybean [Glycine max (L.) Merr.] mutants derived from cv. Williams showed greater early-season dinitrogen fixation potential and partial tolerance to high levels of NO^-₃. Understanding genetic control is essential to manipulation of this trait. Genetic analysis of the NOD1-3 and NOD4 mutants, and the En6500 mutant, had previously shown that these three mutants were controlled by the same recessive allele at the rj₇ locus. However, genetic control of two additional hypernodulating mutants, NOD3-7 and NOD2-4, remained to be verified. We investigated the inheritance and allelic relationship of these latter mutations in relation to those previously studied. The cultivar Harosoy 63 was crossed to the NOD3-7 and NOD2-4 mutants to produce F₁ hybrids, F₂ progeny, and F₂-derived families. Phenotypic segregation was examined. For allelism tests, hypernodulating progeny exhibiting purple hypocotyl, which were isolated from the F₂ segregants of the crosses with Harosoy 63, were used for crossing with the NOD2-4 mutant. Resulting phenotypes were visually evaluated for hypernodulation at 14 d after planting (DAP) in the greenhouse. The results of genetic analysis indicated that a recessive allele was responsible for hypernodulation in the NOD3-7 and NOD2-4 mutants. Allelism analysis revealed that although the hypernodulating mutants were isolated from independent mutational events, the rj₇ locus controlled NOD-type hypernodulating mutants and the En6500 mutant.

Abbreviations: DAP, days after planting

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