Confirmation of shared and divergent genomes in the Glycine tabacina polyploid complex (Leguminosae) using histone H3-D sequences

Glycine tabacina, a wild perennial relative of soybean, comprises a widespr ead polyploid complex in Australia and islands of the Pacific Ocean. Data f rom a single-copy nuclear locus, histone H3-D, confirm the existence of two polyploid races. Plants of one of these (AAB'B') are nonstoloniferous and have linear leaflets. One of the genomes of this race is that of an A-genom e diploid, identified by the histone data most closely with a race of G. to mentella. Its other genome (B'B') was donated by a nonstoloniferous diploid species that is sister to all of the remaining B-genome species, which are stoloniferous. Plants of the second race of polyploid G. tabacina (BBB'B') are stoloniferous, have ovate leaflets, and combine a B' genome with a gen ome of the core B-genome diploid group. The likely source of the shared B' genome is a species previously referred to as G, sp. aff tabacina, that is here formally named Glycine stenophita.