In a recent study of cytoplasmic diversity in the soybean, made by restriction endonuclease analysis, Sisson et al. (1978) and Shoemaker et al. (1986) reported that cytoplasmic uniformity exists among currently grown soybean cultivars. Available evidence suggests that the potential cytoplasmic vulnerability in soybeans is no less than that of most other crops. The identification of cytoplasms from different sources may be one way of preventing possible future disease epidemics.
Cheng, S. H. and Hadley, H. H.
"Research Notes : United States : Cytoplasm sources of soybean cultivars grown in the United States and Canada,"
Soybean Genetics Newsletter: Vol. 13
, Article 41.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol13/iss1/41