Abstract
Chives (Allium schoenoprasum) continuously produce leaves during spring and summer, and continue to develop leaves in winter, although growth is slow (evergreen). They do not produce well-defined bulbs, whereas asatsuki (A. schoenoprasum var. foliosum) forms bulbs with leaf desiccation in summer. Bulb formation of F1 progenies of chives × asatsuki and BC1 plants obtained by crosses with asatsuki was investigated in this study. No F1 progenies formed bulbs. The bulb formation of BC1 was classified based on the bulbing ratio into two phenotypes, e.g. non-bulb-forming and bulb-forming types; however, the variation persisted in obvious bulb-forming and non-bulb-forming individuals. The index of the maximum thickness of scale leaves was an alternative to clearly segregate the BC1 progenies into three types, e.g. no bulb formation, intermediate, and bulb-forming phenotypes. These results indicate that more than two recessive genes are involved in the bulb formation of chive.
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