Abstract
Chromosome number, morphology, and behavior in the mitotic cycle were examined for 334 individuals from 34 local populations of Chamaelirium japonicum, including two infraspecific taxa so far chromosomally uninvestigated, and for 20 individuals from three populations of C. koidzumianum, including one variety cytologically unexplored to date. All of the individuals proved to have holocentric chromosomes, and 351 out of the 354 individuals exhibited 2n=24=4L+20S (where L and S denote ‘long’ and ‘short,’ respectively) and were regarded as diploids (2x). Of the other three individuals of C. japonicum ssp. japonicum, two were triploids (3x) with 2n=36=6L+30S, and one was a hyperploid (2x+1) with 2n=25=4L+19S+2f, of which the two small chromosomes (f) presumably arose by fission in one short chromosome. The triploid and the hyperploid showed lower pollen stainability (16.3 and 71.7%, respectively) with cotton blue than normal diploids (98.0–99.5%). Factors leading to the high stability of chromosomal traits in the two species are suggested.
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