OKAMOTO, M.1). H. ASAMI2) and N. INOMATA3)
Cytological observation of callus tissues from seeds of tetra-5A, -5B and -5D was done in the fourth successive culture of calluses. The results obtained are summarized in the following table.
Chromosome number of callus cells varied considerably as is usually the case with callus tissues.
It is tentatively assumed that the chromosome aberrations listed in the table (*, **) are due to extra dosage of the chromosome 5B which brought centromere instability, and chromosome breakage and reunion. The former resulted in a telocentric chromosome and the latter resulted in dicentric chromosomes.
