1999 年 64 巻 1 号 p. 45-49
A spontaneous chimeral plant of Rhoeo spathacea is described. A selfed plant GAVA 1.1.19 a sib of desynaptic-SDR, GAVA 1.1 resulted a mixoploid with a diploid chromosome number (2n=12) in root tips. The karyotype is a bimodal one with meta-and submeta-centric chromosomes. Based on chromosome number and meiotic behavior there were identified three types of inflorescences : diploids with PMC's with a ring or a chain of 12 chromosomes at MI, mixoploid flowers presented diploid and tetraploid PMC's in about 4 : 1 ratio, and tetraploid inflorescences with PMC's with as many as 24 univalents at MI. It is proposed a semigamy of a diploid heterokaryon with A and B semigenomes.