Zeitschrift für Vererbungslehre 94: 269-279 (1963)
Chromosome mosaics and the recovery of the original strain from octoploid Hordeum murinum
Tibor Rajhathy

Summary
Plants with chromosome numbers (2n=18-54) lower than that of the normal 2n=56 were found in the C1 progeny of colchicine induced octoploid form of Hordeum murinum. Pollen mother cells in three octoploid plants had reduced chromosome complements at meiosis. Some of these plants had the original chromosome number of 2n=28. A number of these cells had regular bivalent pairing at first metaphase. Evidence indicated independent as well as nonindependent assortment of chromosomes at somatic reduction, the latter type resulting in ancestral type pollen mother cells (14II) and gametes respectively. Since normal tetraploid plants were recovered in the progeny (C2) of chromosome mosaics, ancestral type fully balanced egg cells must have also been formed. It is believed that the recovered tetraploids originated presumably from the fusion of double reduced gametes. “Break-down” diploids occurring occasionally among progenies of autoploids may originate from the fusion of such gametes.

Somatic Segregation