Polymitotic Divisions of Microsporocytes in Clarkia Interspecific Hybrids

抄録

Postmeiotic polymitoses were observed in reciprocal interspecific hybrids be-tween two diploid Clarkia species, i.e., C. lassenensis×C. amoena huntiana. These supernumerary mitoses following meiosis are similar in their general features to those previously observed in maize and spider plant (Beadle 1931, Koul 1970). In Clarkia interspecific hybrids, however, the genetic system responsible for these polymitoses is most likely not a simple recessive gene as is the case in maize but rather genic disharmony between the two parental sets of chromosomes.