Glycine max is the second largest cash crop in the USA and is the most important plant source of oil and high protein meal. The current cultivars and breeding lines of G. max, developed through classical breeding methods, are characterized as having an extremely narrow genetic base. US cultivars and plant introductions represent a very limited gene pool and severely limit the introduction of new traits via traditional breeding techniques. Thus, soybean is an ideal crop for use in genetic engineering approaches for developing improved genotypes possessing desirable traits such as increased herbicide and disease resistance (Abel et al. 1986), drought tolerance, modification of oil, and protein quality; ultimately it provides enhanced germplasm for new cultivar development (Christou et al. 1990; Hinchee et al. 1988; Hildebrand et al. 1991). Genetic manipulation of soybean through recombinant DNA technology is severely limited at present by the lack of an efficient transformation and regeneration system for this species.