Abstract
Polyploidy distribution and variations of karyotypes in Allium grayi Regel were examined in 7 natural populations in Okayama Prefecture, Japan. They showed often tetraploid (2n =32) and pentaploid (2n=40) plants together in the 5 populations and hexaploid (2n=48) plants in the Kasaoka population. The hexaploid plant of the species was found for the first time in western-half part of Japan. Tetraploid plants were solely observed in the Oku population and only pentaploid plants were found in the Kuse population. The analysis revealed the presence of the 2 major different karyotypes : One type consisted of only median- and submedian-centromeric chromosomes and the other type consisted of subterminal-centromeric chromosome (s) in addition to median- and submedian-centromeric chromosomes.
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