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Three callus lines from 3 Allium fistulosum L. cultivars (Kaori, Fresh, Wede) and their regenerated plantlets were examined to elucidate the relationship between chromosomal aberration and morphogenetic capacity. In these callus lines, 9 karyotypes that were altered numerically and/or structurally were found in addition to the normal diploid karyotype (type S) identical to that of the mother plant. Structurally changed karyotypes occurred as a result of deletions and/or translocations. Of these, the occurrence of dicentric chromosomes arising through deletions and translocations between 2 al chromosomes was high. In regenerated plantlets from the callus lines, 3 structurally and/or numerically altered karyotypes were found in addition to the type S karyotype. Plantlets regenerated from callus cells were induced via shoot formation and subsequent root formation.

Chromosomal Variation in Callus Lines and Regenerated Plantlets from Three Cultivars of Allium fistulosum L. (2n=16).