Reproductively Isolated Polyploid Races of Glycine Tabcina (Leguminosae) Had Different Chloroplast Genome Donors

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Abstract
Glycine tabacina, a perennial relative of soybean, forms a polyploid complex widespread in eastern Australia and the islands of the western Pacific. The species comprises at least two morphological groups that have been shown to be reproductively isolated from one another. Two major chloroplast DNA classes (plastomes) exist within the species, differing by numerous restriction endonuclease recognition sites. A survey of 91 polyploid accessions was made for marker restriction sites that distinguish these two platome types. The A plastome group was found to be most common in the tropical and subtropical zones of eastern Australia, and the B plastome in temperate and subtropical zone of this same region. Both races were found on islands of the west central Pacific, but samples from the southern Pacific revealed only the B platome. Classification of accessions used in intraspecific crossing studies revealed that literature reports of fertile hybrids were from the crosses within plastome groups, while crosses between groups resulted in sterile hybrids. Plastome classification and morphological variation also were congruent, with plants of the A plastome class having linear adult leaflets and lacking adventitious roots, in contrast to the ovate mature leaflets and stoloniferous habit of B plastome plants.