Soybean (Glycine max) is a typical short-day plant and several loci controlling flowering have been characterized. Whilst genes have been identified for loci E1 to E4, their degree of natural variation is unknown. Tsubokura et al. determine the sequences of these genes and their flanking regions for 39 accessions by primer walking, and perform systematic discrimination among alleles using DNA markers. Allelic combinations at the E1 to E4 loci are found to be associated with ecological types and about 62–66 % of variation of flowering time can be attributed to the loci. The results therefore suggest the existence of unidentified genes for flowering in soybean.
This study's results suggest the existence of unidentified genes for flowering in soybean.