Radiation Induced Desynaptic Mutants in Barley

抄録

Cytomorphological behaviour of two desynaptic mutants obtained by gamma irradiation of barley seeds of var. K 12 have been discussed. The partially desynaptic mutant had normal morphology while desynaptic mutant was semi-dwarf and conspicuous because of the failure of its spike to come out of the flag leaf. Both the mutants were sterile. Chromosome behaviour at meiosis shows varying degree of univalents at metaphase I. Partially desynaptic mutant showed from 2 to 6 univalents while desynaptic mutant had 8 to 14 univalents. 70% cells in this plant showed complete desynapsis. A completely random chromosome disjunction was found at anaphase I, together with lagging of chromosomes. At M II several abnormalities were found as a consequence of previous desynapsis and irregular polarisation.