1974 年 39 巻 1 号 p. 77-81
The partial sterility of the mutant was due to desynaptic condition which was governed by a single recessive gene. Besides the lack of chiasma formation and the presence of univalents, the cytological studies of the mutant revealed several other abnormalities, such as, the clumbing of chromosomes at MI, a high frequency of laggards in both the meiosis I as well as II which usually formed the micronuclei in the dyads and the quartets respectively. The desynaptic plants produced 43.9±1.54 (n=9) and 63.0±0.8 (n=15) percent stainable pollen grains and 12.5±1.5 (n=11) and 34.4±1.0 (n=15) percent seed set under the growth room and field conditions respectively. The possible use of the mutant in the studies of mechanism of chromosome pairing and crossing over and in the production of aneuploids has been indicated.