1994 年 59 巻 4 号 p. 399-404
A mutant causing partial desynapsis (dissociation of paired chromosomes) and consequently a high frequency of univalents at metaphase I was found among plants of a wild population of Rhoeo collected in Merida, Yucatan, MEXICO. The seedlings were found to be diploids with 2n=2x=12. The mutant formed from 6 to 12 univalents/cell and had a karyotype 8M+4SM differing from that of the other desynaptic referred to in other work by the same author which has 7M+5SM. The mutant had a high pollen fertility (65.7%). The produced microspores had chromosome numbers from n=5 to n=14. Unreduced pollen grains were formed at TII via second division restitution and comprised 34.14% of the pollen grains.