Abstract
Soybean [Glycine max (L.) Merr.] chromosomes were analyzed using the chromosome image analyzing system, CHIAS, and seven groups, including subgroups, were identified based on morphological characteristics. Two pairs of chromosomes were conspicuous in their morphological traits. One pair of chromosomes, which had the largest arm ratio among all the chromosomes, was commonly observed in the species in all three subgenera of the genus Glycine. These chromosomes also displayed a unique pattern after N-banding and were detected as marker chromosomes. G. soja, which is considered to be the ancestor of G. max, has two types of marker chromosomes. The lines that carry the same type as G. max may be the ancestors of G. max among the lines of G. soja. The morphological differences of the marker chromosomes within the species in the subgenus Soja are discussed in relation to the domestication process of soybean.
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