Abstract
This study was designed to find a useful method for obtaining the various types of trisomics in rice plants. The use of primary simple trisomic plants is a new valuable method for studies of likage analysis. Autotriploid, completely asynaptic, and partially asynaptic rice plants and their progenies were used. Of 258 plants observed cytologically, 47 were heteroploid with 25∼33 chromosomes in somatic cells. These heteroploid plants were simple, double and triple trisomic plants as indicated by the chromosome configurations at diakinesis and metaphase-I in meiotic division. It is of interest that trisomic plants were easily obtained from the progenies of partially asynaptic rice plants.
