Inheritance of male-sterility in soybean
Adilson Luiz Seifert; Leones Alves de Almeida and Romeu Afonso de Souza Kiihl
Genetic studies on a spontaneous male-sterile/female-fertile soybean mutant identified at the Embrapa Soybean breeding program were carried out in Londrina County, State of Paraná, South Brazil. The mutant showing segregation for male-sterility (BR97-17958) was selected within F5 progeny lines derived from the BR5(6) x Paranaíba cross performed in 1995. The F1, F2 and F3 generations from test-crossings among heterozygous plants of the BR97-17958 line and recessive homozygous plants (male-sterile) of the T 266H (ms1ms1), T 259H (ms2ms2), T 273H (ms3ms3), T 274H (ms4ms4), T 277H (ms5ms5) and T 295H (ms6ms6) lines were studied to identify whether this mutant defines a new locus or represents an independent mutation in one of the six loci already described. The F1, F2, and F3 plants from the crosses were visually classified as presenting normal phenotype of male fertility or male-sterility. Results from inheritance and allele test study among the mutant genotypes and the recessive homozygous male-sterile lines (ms1, ms2, ms3, ms4, ms5 and ms6) provided evidence that the male-sterile characteristic of the line BR97-17958 have a simple recessive Mendelian inheritance and represents a mutation in a locus different from the ms-loci already described.