Abstract
1. Several types of hypo- and hyper-ploids were found along with euploids BB, BBB, ABB, AABB, and ABBB among plants from a natural population of Scilla scilloides Druce at Nakabaru. Here A (x=8) indicates one of two genomes which compose the S. scilloides complex, and B (x=9) another one. Lacking or additional chromosomes in hypo- and hyper-ploids, ABB-1, -2, ABB+1, +2, +3, +5, AABB-1, -2, -3, were confirmed to be members of the genome A.
2. The majority of progenies from seeds collected from ABB open-pollinated in the natural population was hypo- and hyper-ploid. Hypo- and hyper-ploids were also found in the progenies from the seeds from the mother plants BB and AABB. These facts indicate frequent occurrence of selfing of, and/or crossing between ABB, as well as crossing of ABB with BB and/or AABB. Therefore, ABB is primarily responsible for the origin of hypo- and hyper-ploids in the natural population.
