E6, a dominant gene conditioning early flowering and maturity in soybeans

Inheritance was studied in natural variants of the soybean cultivar Parana, developed under photoperiodic conditions ranging from 13 h 31 min day light, at sowing, to 14 h 23 min, 59 days afterwards. Results indicated that early flowering and maturity are controlled by a single dominant gene. Natural mutations that originated cultivars Paranagolana and SS-1 occurred at the same locus of cultivar Parana. It was not possible to determine if the recessive alleles of these mutant cultivars are different. The designation E-6 was proposed for the alleles determining earliness in cultivar Parana, and e(6) for the gene determining late flowering and maturity in cultivars Paranagoiana and SS-1, until the individuality of the alleles of Paranagoiana and SS-1 is confirmed.