Author
 |
Harper, James |
|
Submitted to: United States Japan Seminar Series
Publication Type: Abstract Only Publication Acceptance Date: 10/30/1995 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Following mutagenesis and selection, soybean lines were selected which were nonnodulated or hypernodulated (two to four X normal nodule #). One nonnodulating line (NN5) was isolated, and in crosses with several normally nodulated cultivars appeared to controlled by a single recessive gene. In crosses with Harosoy, however, a second gene was identified. Neither of these genes was allelic to rj1, which was identified in a natural population of soybean. Thus NN5 carries two recessive genes, named rj5 and rj6, both which must be in recessive condition to prevent nodule formation. The rj5 gene is also carried in NOD49, a nonnodulating mutant of Bragg isolated in Australia. Genetic characterization has revealed that NOD1-3, NOD3-7, and NOD4 (from my lab) carry a single recessive gene resulting in hypernodulation. The same gene is expressed in En6500 (supernodulating mutant of Enrei isolated in Japan) and nts382 (supernodulating mutant of Bragg isolated in Australia). This gene was recently named as rj7. One hypernodulated mutant (NOD 2-4 from my lab) expressed a single recessive gene at a separate allele, and has been tentatively designated as rj8 pending further verification. |
