EN
In soybean cv. Fiskeby, among the Mi plants obtained after seed irradiation with fast neutron (at the dosis of 100 rad), a changed plant was found. The plant was considerably greater and formed much more seeds in comparison with control. In the next generations of the single plant, several macromutations were found. Among the mutants, following seem to be of greater breeding value: tall, giants and with remarkable bigger leaves (tab. 3). From theoretical point of view, of interest are also climbing and semi-climbing mutants. The Mi plant certainly was an example of the rare complex mutation.