Since the 1950s, there have been a lot of geneticists who studied the genetic variation of the populations derived from irradiated seeds in the world, but only a few who studied the principle of selection for these populations. Some breeders have not only developed new varieties by using irradiation, but also have studied the genetic variation of irradiated popula-tions. However, the populations that they used had been often selected; therefore, it was hard to avoid that the results had been influenced by di-rectional selection effect.
"Research Notes : China : Studies on genetic variation of soybean agronomic characters induced by seed irradiation,"
Soybean Genetics Newsletter: Vol. 14
, Article 18.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol14/iss1/18