We used historical data (1973-2015) collected at the World Vegetable Center, Taiwan for developing a small-seeded soybean (Glycine max L. Merr.) core collection representing the diversity of the whole collection held by the Center.

The collection was first filtered on the basis of the 100 seed weight: less than 25g. The small-seeded group (grain) comprised 7,397 accessions with morphological data. Within this group, we developed a core collection based on 7 quantitative and 14 qualitative traits collected during the autumn season, resulting in a core collection of 1,466 small-seeded grain soybean accessions.